Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1737999 > unrolled thread
| Started by | Ingo Molnar <mingo@kernel.org> |
|---|---|
| First post | 2017-09-23 15:10 +0200 |
| Last post | 2017-09-24 01:30 +0200 |
| Articles | 20 on this page of 68 — 8 participants |
Back to article view | Back to linux.kernel
[PATCH 00/33] x86 FPU fixes and cleanups for v4.14 Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[PATCH 19/33] x86/fpu: Decouple fpregs_activate()/fpregs_deactivate() from fpu->fpregs_active Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Decouple fpregs_activate()/fpregs_deactivate() from fpu->fpregs_active tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 15/33] x86/fpu: Simplify fpu->fpregs_active use Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Simplify fpu->fpregs_active use tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 26/33] x86/fpu: Reinitialize FPU registers if restoring FPU state fails Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Reinitialize FPU registers if restoring FPU state fails tip-bot for Eric Biggers <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 32/33] x86/fpu: Rename fpu__activate_curr() to fpu__initialize() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Rename fpu__activate_curr() to fpu__initialize() tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:50 +0200
[PATCH 31/33] x86/fpu: Simplify and speed up fpu__copy() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Simplify and speed up fpu__copy() tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:50 +0200
[PATCH 21/33] x86/fpu: Add FPU state copying quirk to handle XRSTOR failure on Intel Skylake CPUs Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Add FPU state copying quirk to handle XRSTOR failure on Intel Skylake CPUs tip-bot for Rik van Riel <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 13/33] x86/fpu: Remove 'kbuf' parameter from the copy_user_to_xstate() API Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Remove 'kbuf' parameter from the copy_user_to_xstate() API tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 33/33] x86/fpu: Rename fpu__activate_fpstate_read/write() to fpu__read/write() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[PATCH 02/33] x86/fpu: Split copy_xstate_to_user() into copy_xstate_to_kernel() & copy_xstate_to_user() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Split copy_xstate_to_user() into copy_xstate_to_kernel() & copy_xstate_to_user() tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:30 +0200
[PATCH 16/33] x86/fpu: Make the fpu state change in fpu__clear() scheduler-atomic Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Make the fpu state change in fpu__clear() scheduler-atomic tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 14/33] x86/fpu: Flip the parameter order in copy_*_to_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Flip the parameter order in copy_*_to_xstate() tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 11/33] x86/fpu: Split copy_user_to_xstate() into copy_kernel_to_xstate() & copy_user_to_xstate() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Split copy_user_to_xstate() into copy_kernel_to_xstate() & copy_user_to_xstate() tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 07/33] x86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 01/33] x86/fpu: Rename copyin_to_xsaves()/copyout_from_xsaves() to copy_user_to_xstate()/copy_xstate_to_user() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Rename copyin_to_xsaves()/copyout_from_xsaves() to copy_user_to_xstate()/copy_xstate_to_user() tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:30 +0200
[PATCH 29/33] x86/fpu: Rename fpu::fpstate_active to fpu::initialized Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Rename fpu::fpstate_active to fpu::initialized tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:50 +0200
[PATCH 17/33] x86/fpu: Split the state handling in fpu__drop() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Split the state handling in fpu__drop() tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 09/33] x86/fpu: Change 'size_total' parameter to unsigned and standardize the size checks in copy_xstate_to_*() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Change 'size_total' parameter to unsigned and standardize the size checks in copy_xstate_to_*() tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 30/33] x86/fpu: Fix stale comments about lazy FPU logic Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Fix stale comments about lazy FPU logic tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:50 +0200
[PATCH 08/33] x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
Re: [PATCH 08/33] x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods Thomas Gleixner <tglx@linutronix.de> - 2017-09-25 22:00 +0200
Re: [PATCH 08/33] x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods Thomas Gleixner <tglx@linutronix.de> - 2017-09-25 22:10 +0200
[tip:x86/fpu] x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 20/33] x86/fpu: Remove struct fpu::fpregs_active Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Remove struct fpu::fpregs_active tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 03/33] x86/fpu: Remove 'ubuf' parameter from the copy_xstate_to_kernel() APIs Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Remove 'ubuf' parameter from the copy_xstate_to_kernel() APIs tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:30 +0200
[PATCH 23/33] x86/fpu: Turn WARN_ON() in context switch into WARN_ON_FPU() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Turn WARN_ON() in context switch into WARN_ON_FPU() tip-bot for Andi Kleen <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 22/33] x86/fpu: Fix boolreturn.cocci warnings Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Fix boolreturn.cocci warnings tip-bot for kbuild test robot <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 06/33] x86/fpu: Clean up the parameter definitions of copy_xstate_to_*() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Clean up the parameter definitions of copy_xstate_to_*() tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 04/33] x86/fpu: Remove 'kbuf' parameter from the copy_xstate_to_user() APIs Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Remove 'kbuf' parameter from the copy_xstate_to_user() APIs tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 05/33] x86/fpu: Clean up parameter order in the copy_xstate_to_*() APIs Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Clean up parameter order in the copy_xstate_to_*() APIs tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 24/33] x86/fpu: Don't let userspace set bogus xcomp_bv Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Don't let userspace set bogus xcomp_bv tip-bot for Eric Biggers <tipbot@zytor.com> - 2017-09-26 10:50 +0200
[PATCH 18/33] x86/fpu: Change fpu->fpregs_active users to fpu->fpstate_active Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Change fpu->fpregs_active users to fpu->fpstate_active tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 27/33] x86/fpu: Simplify fpu__activate_fpstate_read() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Fix fpu__activate_fpstate_read() and update comments tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 12/33] x86/fpu: Remove 'ubuf' parameter from the copy_kernel_to_xstate() API Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Remove 'ubuf' parameter from the copy_kernel_to_xstate() API tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
[PATCH 25/33] x86/fpu: Tighten validation of user-supplied xstate_header Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[PATCH 28/33] x86/fpu: Remove fpu__current_fpstate_write_begin/end() Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
[tip:x86/fpu] x86/fpu: Remove fpu__current_fpstate_write_begin/end() tip-bot for Ingo Molnar <tipbot@zytor.com> - 2017-09-26 10:40 +0200
Re: [PATCH 00/33] x86 FPU fixes and cleanups for v4.14 Ingo Molnar <mingo@kernel.org> - 2017-09-23 15:10 +0200
Re: [PATCH 00/33] x86 FPU fixes and cleanups for v4.14 Juergen Gross <jgross@suse.com> - 2017-09-23 17:10 +0200
Re: [PATCH 00/33] x86 FPU fixes and cleanups for v4.14 Ingo Molnar <mingo@kernel.org> - 2017-09-24 01:30 +0200
Page 2 of 4 — ← Prev page 1 [2] 3 4 Next page →
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2017-09-23 15:10 +0200 |
| Subject | [PATCH 14/33] x86/fpu: Flip the parameter order in copy_*_to_xstate() |
| Message-ID | <usSlY-3wU-25@gated-at.bofh.it> |
| In reply to | #1737999 |
Make it more consistent with regular memcpy() semantics, where the destination
argument comes first.
No change in functionality.
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/fpu/xstate.h | 4 ++--
arch/x86/kernel/fpu/regset.c | 4 ++--
arch/x86/kernel/fpu/signal.c | 2 +-
arch/x86/kernel/fpu/xstate.c | 4 ++--
4 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index 4ceb90740d80..579ac2358e63 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -50,6 +50,6 @@ const void *get_xsave_field_ptr(int xstate_field);
int using_compacted_format(void);
int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
-int copy_kernel_to_xstate(const void *kbuf, struct xregs_state *xsave);
-int copy_user_to_xstate(const void __user *ubuf, struct xregs_state *xsave);
+int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf);
+int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf);
#endif
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index caf723f31737..19a7385a912c 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -136,9 +136,9 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
if (boot_cpu_has(X86_FEATURE_XSAVES)) {
if (kbuf)
- ret = copy_kernel_to_xstate(kbuf, xsave);
+ ret = copy_kernel_to_xstate(xsave, kbuf);
else
- ret = copy_user_to_xstate(ubuf, xsave);
+ ret = copy_user_to_xstate(xsave, ubuf);
} else {
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, xsave, 0, -1);
}
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 2c685b492fd6..2d682dac35d4 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -324,7 +324,7 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
fpu__drop(fpu);
if (using_compacted_format())
- err = copy_user_to_xstate(buf_fx, &fpu->state.xsave);
+ err = copy_user_to_xstate(&fpu->state.xsave, buf_fx);
else
err = __copy_from_user(&fpu->state.xsave, buf_fx, state_size);
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index b1f3e4dae2e3..0ef35040d0ad 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -1089,7 +1089,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
* there we check the CPU has XSAVES and a whole standard-sized buffer
* exists.
*/
-int copy_kernel_to_xstate(const void *kbuf, struct xregs_state *xsave)
+int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf)
{
unsigned int offset, size;
int i;
@@ -1142,7 +1142,7 @@ int copy_kernel_to_xstate(const void *kbuf, struct xregs_state *xsave)
* there we check the CPU has XSAVES and a whole standard-sized buffer
* exists.
*/
-int copy_user_to_xstate(const void __user *ubuf, struct xregs_state *xsave)
+int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf)
{
unsigned int offset, size;
int i;
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | tip-bot for Ingo Molnar <tipbot@zytor.com> |
|---|---|
| Date | 2017-09-26 10:40 +0200 |
| Subject | [tip:x86/fpu] x86/fpu: Flip the parameter order in copy_*_to_xstate() |
| Message-ID | <utTzm-2jm-57@gated-at.bofh.it> |
| In reply to | #1738011 |
Commit-ID: 6d7f7da5533a3f841eeb1d9657257c9367924274
Gitweb: http://git.kernel.org/tip/6d7f7da5533a3f841eeb1d9657257c9367924274
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Sat, 23 Sep 2017 14:59:57 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sun, 24 Sep 2017 13:04:33 +0200
x86/fpu: Flip the parameter order in copy_*_to_xstate()
Make it more consistent with regular memcpy() semantics, where the destination
argument comes first.
No change in functionality.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-15-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/fpu/xstate.h | 4 ++--
arch/x86/kernel/fpu/regset.c | 4 ++--
arch/x86/kernel/fpu/signal.c | 2 +-
arch/x86/kernel/fpu/xstate.c | 4 ++--
4 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index 4ceb907..579ac23 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -50,6 +50,6 @@ const void *get_xsave_field_ptr(int xstate_field);
int using_compacted_format(void);
int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
-int copy_kernel_to_xstate(const void *kbuf, struct xregs_state *xsave);
-int copy_user_to_xstate(const void __user *ubuf, struct xregs_state *xsave);
+int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf);
+int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf);
#endif
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index caf723f..19a7385 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -136,9 +136,9 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
if (boot_cpu_has(X86_FEATURE_XSAVES)) {
if (kbuf)
- ret = copy_kernel_to_xstate(kbuf, xsave);
+ ret = copy_kernel_to_xstate(xsave, kbuf);
else
- ret = copy_user_to_xstate(ubuf, xsave);
+ ret = copy_user_to_xstate(xsave, ubuf);
} else {
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, xsave, 0, -1);
}
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 2c685b4..2d682da 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -324,7 +324,7 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
fpu__drop(fpu);
if (using_compacted_format())
- err = copy_user_to_xstate(buf_fx, &fpu->state.xsave);
+ err = copy_user_to_xstate(&fpu->state.xsave, buf_fx);
else
err = __copy_from_user(&fpu->state.xsave, buf_fx, state_size);
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index b1f3e4d..0ef3504 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -1089,7 +1089,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
* there we check the CPU has XSAVES and a whole standard-sized buffer
* exists.
*/
-int copy_kernel_to_xstate(const void *kbuf, struct xregs_state *xsave)
+int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf)
{
unsigned int offset, size;
int i;
@@ -1142,7 +1142,7 @@ int copy_kernel_to_xstate(const void *kbuf, struct xregs_state *xsave)
* there we check the CPU has XSAVES and a whole standard-sized buffer
* exists.
*/
-int copy_user_to_xstate(const void __user *ubuf, struct xregs_state *xsave)
+int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf)
{
unsigned int offset, size;
int i;
[toc] | [prev] | [next] | [standalone]
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2017-09-23 15:10 +0200 |
| Subject | [PATCH 11/33] x86/fpu: Split copy_user_to_xstate() into copy_kernel_to_xstate() & copy_user_to_xstate() |
| Message-ID | <usSlY-3wU-27@gated-at.bofh.it> |
| In reply to | #1737999 |
Similar to:
x86/fpu: Split copy_xstate_to_user() into copy_xstate_to_kernel() & copy_xstate_to_user()
No change in functionality.
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/fpu/xstate.h | 4 ++--
arch/x86/kernel/fpu/regset.c | 10 ++++++---
arch/x86/kernel/fpu/xstate.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 74 insertions(+), 6 deletions(-)
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index fed6617a1079..79af79dbcab6 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -50,6 +50,6 @@ const void *get_xsave_field_ptr(int xstate_field);
int using_compacted_format(void);
int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
-int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
- struct xregs_state *xsave);
+int copy_kernel_to_xstate(const void *kbuf, const void __user *ubuf, struct xregs_state *xsave);
+int copy_user_to_xstate(const void *kbuf, const void __user *ubuf, struct xregs_state *xsave);
#endif
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index ec1404194b65..cb45dd81d617 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -134,10 +134,14 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
fpu__activate_fpstate_write(fpu);
- if (boot_cpu_has(X86_FEATURE_XSAVES))
- ret = copy_user_to_xstate(kbuf, ubuf, xsave);
- else
+ if (boot_cpu_has(X86_FEATURE_XSAVES)) {
+ if (kbuf)
+ ret = copy_kernel_to_xstate(kbuf, ubuf, xsave);
+ else
+ ret = copy_user_to_xstate(kbuf, ubuf, xsave);
+ } else {
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, xsave, 0, -1);
+ }
/*
* In case of failure, mark all states as init:
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 00c3b41c3cf1..1ad25d1b8056 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -1084,7 +1084,71 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
}
/*
- * Convert from a ptrace standard-format buffer to kernel XSAVES format
+ * Convert from a ptrace standard-format kernel buffer to kernel XSAVES format
+ * and copy to the target thread. This is called from xstateregs_set() and
+ * there we check the CPU has XSAVES and a whole standard-sized buffer
+ * exists.
+ */
+int copy_kernel_to_xstate(const void *kbuf, const void __user *ubuf,
+ struct xregs_state *xsave)
+{
+ unsigned int offset, size;
+ int i;
+ u64 xfeatures;
+ u64 allowed_features;
+
+ offset = offsetof(struct xregs_state, header);
+ size = sizeof(xfeatures);
+
+ if (kbuf) {
+ memcpy(&xfeatures, kbuf + offset, size);
+ } else {
+ if (__copy_from_user(&xfeatures, ubuf + offset, size))
+ return -EFAULT;
+ }
+
+ /*
+ * Reject if the user sets any disabled or supervisor features:
+ */
+ allowed_features = xfeatures_mask & ~XFEATURE_MASK_SUPERVISOR;
+
+ if (xfeatures & ~allowed_features)
+ return -EINVAL;
+
+ for (i = 0; i < XFEATURE_MAX; i++) {
+ u64 mask = ((u64)1 << i);
+
+ if (xfeatures & mask) {
+ void *dst = __raw_xsave_addr(xsave, 1 << i);
+
+ offset = xstate_offsets[i];
+ size = xstate_sizes[i];
+
+ if (kbuf) {
+ memcpy(dst, kbuf + offset, size);
+ } else {
+ if (__copy_from_user(dst, ubuf + offset, size))
+ return -EFAULT;
+ }
+ }
+ }
+
+ /*
+ * The state that came in from userspace was user-state only.
+ * Mask all the user states out of 'xfeatures':
+ */
+ xsave->header.xfeatures &= XFEATURE_MASK_SUPERVISOR;
+
+ /*
+ * Add back in the features that came in from userspace:
+ */
+ xsave->header.xfeatures |= xfeatures;
+
+ return 0;
+}
+
+/*
+ * Convert from a ptrace standard-format user-space buffer to kernel XSAVES format
* and copy to the target thread. This is called from xstateregs_set() and
* there we check the CPU has XSAVES and a whole standard-sized buffer
* exists.
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | tip-bot for Ingo Molnar <tipbot@zytor.com> |
|---|---|
| Date | 2017-09-26 10:40 +0200 |
| Subject | [tip:x86/fpu] x86/fpu: Split copy_user_to_xstate() into copy_kernel_to_xstate() & copy_user_to_xstate() |
| Message-ID | <utTzk-2jm-19@gated-at.bofh.it> |
| In reply to | #1738012 |
Commit-ID: 79fecc2b7506f29fb91becc65e8788e5ae7eba9f
Gitweb: http://git.kernel.org/tip/79fecc2b7506f29fb91becc65e8788e5ae7eba9f
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Sat, 23 Sep 2017 14:59:54 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sun, 24 Sep 2017 13:04:32 +0200
x86/fpu: Split copy_user_to_xstate() into copy_kernel_to_xstate() & copy_user_to_xstate()
Similar to:
x86/fpu: Split copy_xstate_to_user() into copy_xstate_to_kernel() & copy_xstate_to_user()
No change in functionality.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-12-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/fpu/xstate.h | 4 +--
arch/x86/kernel/fpu/regset.c | 10 ++++--
arch/x86/kernel/fpu/xstate.c | 66 ++++++++++++++++++++++++++++++++++++++-
3 files changed, 74 insertions(+), 6 deletions(-)
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index fed6617..79af79d 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -50,6 +50,6 @@ const void *get_xsave_field_ptr(int xstate_field);
int using_compacted_format(void);
int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
-int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
- struct xregs_state *xsave);
+int copy_kernel_to_xstate(const void *kbuf, const void __user *ubuf, struct xregs_state *xsave);
+int copy_user_to_xstate(const void *kbuf, const void __user *ubuf, struct xregs_state *xsave);
#endif
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index ec14041..cb45dd8 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -134,10 +134,14 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
fpu__activate_fpstate_write(fpu);
- if (boot_cpu_has(X86_FEATURE_XSAVES))
- ret = copy_user_to_xstate(kbuf, ubuf, xsave);
- else
+ if (boot_cpu_has(X86_FEATURE_XSAVES)) {
+ if (kbuf)
+ ret = copy_kernel_to_xstate(kbuf, ubuf, xsave);
+ else
+ ret = copy_user_to_xstate(kbuf, ubuf, xsave);
+ } else {
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, xsave, 0, -1);
+ }
/*
* In case of failure, mark all states as init:
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 00c3b41..1ad25d1 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -1084,7 +1084,71 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
}
/*
- * Convert from a ptrace standard-format buffer to kernel XSAVES format
+ * Convert from a ptrace standard-format kernel buffer to kernel XSAVES format
+ * and copy to the target thread. This is called from xstateregs_set() and
+ * there we check the CPU has XSAVES and a whole standard-sized buffer
+ * exists.
+ */
+int copy_kernel_to_xstate(const void *kbuf, const void __user *ubuf,
+ struct xregs_state *xsave)
+{
+ unsigned int offset, size;
+ int i;
+ u64 xfeatures;
+ u64 allowed_features;
+
+ offset = offsetof(struct xregs_state, header);
+ size = sizeof(xfeatures);
+
+ if (kbuf) {
+ memcpy(&xfeatures, kbuf + offset, size);
+ } else {
+ if (__copy_from_user(&xfeatures, ubuf + offset, size))
+ return -EFAULT;
+ }
+
+ /*
+ * Reject if the user sets any disabled or supervisor features:
+ */
+ allowed_features = xfeatures_mask & ~XFEATURE_MASK_SUPERVISOR;
+
+ if (xfeatures & ~allowed_features)
+ return -EINVAL;
+
+ for (i = 0; i < XFEATURE_MAX; i++) {
+ u64 mask = ((u64)1 << i);
+
+ if (xfeatures & mask) {
+ void *dst = __raw_xsave_addr(xsave, 1 << i);
+
+ offset = xstate_offsets[i];
+ size = xstate_sizes[i];
+
+ if (kbuf) {
+ memcpy(dst, kbuf + offset, size);
+ } else {
+ if (__copy_from_user(dst, ubuf + offset, size))
+ return -EFAULT;
+ }
+ }
+ }
+
+ /*
+ * The state that came in from userspace was user-state only.
+ * Mask all the user states out of 'xfeatures':
+ */
+ xsave->header.xfeatures &= XFEATURE_MASK_SUPERVISOR;
+
+ /*
+ * Add back in the features that came in from userspace:
+ */
+ xsave->header.xfeatures |= xfeatures;
+
+ return 0;
+}
+
+/*
+ * Convert from a ptrace standard-format user-space buffer to kernel XSAVES format
* and copy to the target thread. This is called from xstateregs_set() and
* there we check the CPU has XSAVES and a whole standard-sized buffer
* exists.
[toc] | [prev] | [next] | [standalone]
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2017-09-23 15:10 +0200 |
| Subject | [PATCH 07/33] x86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions |
| Message-ID | <usSlY-3wU-35@gated-at.bofh.it> |
| In reply to | #1737999 |
'start_pos' is always 0, so remove it and remove the pointless check of 'pos < 0'
which can not ever be true as 'pos' is unsigned ...
No change in functionality.
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/fpu/xstate.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 9647e7256179..1f50fdaf4c5a 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -927,9 +927,9 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
static inline int
__copy_xstate_to_kernel(void *kbuf,
const void *data,
- unsigned int pos, unsigned int count, int start_pos, int end_pos)
+ unsigned int pos, unsigned int count, int end_pos)
{
- if ((count == 0) || (pos < start_pos))
+ if (!count)
return 0;
if (end_pos < 0 || pos < end_pos) {
@@ -972,7 +972,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = offsetof(struct xregs_state, header);
size = sizeof(header);
- ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, 0, count);
+ ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, count);
if (ret)
return ret;
@@ -986,7 +986,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = xstate_offsets[i];
size = xstate_sizes[i];
- ret = __copy_xstate_to_kernel(kbuf, src, offset, size, 0, count);
+ ret = __copy_xstate_to_kernel(kbuf, src, offset, size, count);
if (ret)
return ret;
@@ -1002,7 +1002,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = offsetof(struct fxregs_state, sw_reserved);
size = sizeof(xstate_fx_sw_bytes);
- ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, 0, count);
+ ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, count);
if (ret)
return ret;
@@ -1010,9 +1010,9 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
}
static inline int
-__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, unsigned int count, int start_pos, int end_pos)
+__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, unsigned int count, int end_pos)
{
- if ((count == 0) || (pos < start_pos))
+ if (!count)
return 0;
if (end_pos < 0 || pos < end_pos) {
@@ -1055,7 +1055,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = offsetof(struct xregs_state, header);
size = sizeof(header);
- ret = __copy_xstate_to_user(ubuf, &header, offset, size, 0, count);
+ ret = __copy_xstate_to_user(ubuf, &header, offset, size, count);
if (ret)
return ret;
@@ -1069,7 +1069,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = xstate_offsets[i];
size = xstate_sizes[i];
- ret = __copy_xstate_to_user(ubuf, src, offset, size, 0, count);
+ ret = __copy_xstate_to_user(ubuf, src, offset, size, count);
if (ret)
return ret;
@@ -1085,7 +1085,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = offsetof(struct fxregs_state, sw_reserved);
size = sizeof(xstate_fx_sw_bytes);
- ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, 0, count);
+ ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, count);
if (ret)
return ret;
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | tip-bot for Ingo Molnar <tipbot@zytor.com> |
|---|---|
| Date | 2017-09-26 10:40 +0200 |
| Subject | [tip:x86/fpu] x86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions |
| Message-ID | <utTzm-2jm-69@gated-at.bofh.it> |
| In reply to | #1738013 |
Commit-ID: 8a5b731889cbf004b406d988dc591c8a7aac773e
Gitweb: http://git.kernel.org/tip/8a5b731889cbf004b406d988dc591c8a7aac773e
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Sat, 23 Sep 2017 14:59:50 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sun, 24 Sep 2017 13:04:31 +0200
x86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions
'start_pos' is always 0, so remove it and remove the pointless check of 'pos < 0'
which can not ever be true as 'pos' is unsigned ...
No change in functionality.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-8-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/fpu/xstate.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 9647e72..1f50fda 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -927,9 +927,9 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
static inline int
__copy_xstate_to_kernel(void *kbuf,
const void *data,
- unsigned int pos, unsigned int count, int start_pos, int end_pos)
+ unsigned int pos, unsigned int count, int end_pos)
{
- if ((count == 0) || (pos < start_pos))
+ if (!count)
return 0;
if (end_pos < 0 || pos < end_pos) {
@@ -972,7 +972,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = offsetof(struct xregs_state, header);
size = sizeof(header);
- ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, 0, count);
+ ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, count);
if (ret)
return ret;
@@ -986,7 +986,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = xstate_offsets[i];
size = xstate_sizes[i];
- ret = __copy_xstate_to_kernel(kbuf, src, offset, size, 0, count);
+ ret = __copy_xstate_to_kernel(kbuf, src, offset, size, count);
if (ret)
return ret;
@@ -1002,7 +1002,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = offsetof(struct fxregs_state, sw_reserved);
size = sizeof(xstate_fx_sw_bytes);
- ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, 0, count);
+ ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, count);
if (ret)
return ret;
@@ -1010,9 +1010,9 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
}
static inline int
-__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, unsigned int count, int start_pos, int end_pos)
+__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, unsigned int count, int end_pos)
{
- if ((count == 0) || (pos < start_pos))
+ if (!count)
return 0;
if (end_pos < 0 || pos < end_pos) {
@@ -1055,7 +1055,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = offsetof(struct xregs_state, header);
size = sizeof(header);
- ret = __copy_xstate_to_user(ubuf, &header, offset, size, 0, count);
+ ret = __copy_xstate_to_user(ubuf, &header, offset, size, count);
if (ret)
return ret;
@@ -1069,7 +1069,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = xstate_offsets[i];
size = xstate_sizes[i];
- ret = __copy_xstate_to_user(ubuf, src, offset, size, 0, count);
+ ret = __copy_xstate_to_user(ubuf, src, offset, size, count);
if (ret)
return ret;
@@ -1085,7 +1085,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = offsetof(struct fxregs_state, sw_reserved);
size = sizeof(xstate_fx_sw_bytes);
- ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, 0, count);
+ ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, count);
if (ret)
return ret;
[toc] | [prev] | [next] | [standalone]
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2017-09-23 15:10 +0200 |
| Subject | [PATCH 01/33] x86/fpu: Rename copyin_to_xsaves()/copyout_from_xsaves() to copy_user_to_xstate()/copy_xstate_to_user() |
| Message-ID | <usSlZ-3wU-41@gated-at.bofh.it> |
| In reply to | #1737999 |
The 'copyin/copyout' nomenclature needlessly departs from what the modern FPU code
uses, which is:
copy_fpregs_to_fpstate()
copy_fpstate_to_sigframe()
copy_fregs_to_user()
copy_fxregs_to_kernel()
copy_fxregs_to_user()
copy_kernel_to_fpregs()
copy_kernel_to_fregs()
copy_kernel_to_fxregs()
copy_kernel_to_xregs()
copy_user_to_fregs()
copy_user_to_fxregs()
copy_user_to_xregs()
copy_xregs_to_kernel()
copy_xregs_to_user()
I.e. according to this pattern, the following rename should be done:
copyin_to_xsaves() -> copy_user_to_xstate()
copyout_from_xsaves() -> copy_xstate_to_user()
or, if we want to be pedantic, denote that that the user-space format is ptrace:
copyin_to_xsaves() -> copy_user_ptrace_to_xstate()
copyout_from_xsaves() -> copy_xstate_to_user_ptrace()
But I'd suggest the shorter, non-pedantic name.
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/fpu/xstate.h | 4 ++--
arch/x86/kernel/fpu/regset.c | 4 ++--
arch/x86/kernel/fpu/signal.c | 2 +-
arch/x86/kernel/fpu/xstate.c | 4 ++--
4 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index 1b2799e0699a..a1baa17e9748 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -48,8 +48,8 @@ void fpu__xstate_clear_all_cpu_caps(void);
void *get_xsave_addr(struct xregs_state *xsave, int xstate);
const void *get_xsave_field_ptr(int xstate_field);
int using_compacted_format(void);
-int copyout_from_xsaves(unsigned int pos, unsigned int count, void *kbuf,
+int copy_xstate_to_user(unsigned int pos, unsigned int count, void *kbuf,
void __user *ubuf, struct xregs_state *xsave);
-int copyin_to_xsaves(const void *kbuf, const void __user *ubuf,
+int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
struct xregs_state *xsave);
#endif
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index b188b16841e3..165d0545c924 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -92,7 +92,7 @@ int xstateregs_get(struct task_struct *target, const struct user_regset *regset,
fpu__activate_fpstate_read(fpu);
if (using_compacted_format()) {
- ret = copyout_from_xsaves(pos, count, kbuf, ubuf, xsave);
+ ret = copy_xstate_to_user(pos, count, kbuf, ubuf, xsave);
} else {
fpstate_sanitize_xstate(fpu);
/*
@@ -132,7 +132,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
fpu__activate_fpstate_write(fpu);
if (boot_cpu_has(X86_FEATURE_XSAVES))
- ret = copyin_to_xsaves(kbuf, ubuf, xsave);
+ ret = copy_user_to_xstate(kbuf, ubuf, xsave);
else
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, xsave, 0, -1);
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 83c23c230b4c..b1fe9a1fc4e0 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -324,7 +324,7 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
fpu__drop(fpu);
if (using_compacted_format()) {
- err = copyin_to_xsaves(NULL, buf_fx,
+ err = copy_user_to_xstate(NULL, buf_fx,
&fpu->state.xsave);
} else {
err = __copy_from_user(&fpu->state.xsave,
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index c24ac1efb12d..e7bb41723eaa 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -951,7 +951,7 @@ static inline int xstate_copyout(unsigned int pos, unsigned int count,
* zero. This is called from xstateregs_get() and there we check the CPU
* has XSAVES.
*/
-int copyout_from_xsaves(unsigned int pos, unsigned int count, void *kbuf,
+int copy_xstate_to_user(unsigned int pos, unsigned int count, void *kbuf,
void __user *ubuf, struct xregs_state *xsave)
{
unsigned int offset, size;
@@ -1023,7 +1023,7 @@ int copyout_from_xsaves(unsigned int pos, unsigned int count, void *kbuf,
* there we check the CPU has XSAVES and a whole standard-sized buffer
* exists.
*/
-int copyin_to_xsaves(const void *kbuf, const void __user *ubuf,
+int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
struct xregs_state *xsave)
{
unsigned int offset, size;
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | tip-bot for Ingo Molnar <tipbot@zytor.com> |
|---|---|
| Date | 2017-09-26 10:30 +0200 |
| Subject | [tip:x86/fpu] x86/fpu: Rename copyin_to_xsaves()/copyout_from_xsaves() to copy_user_to_xstate()/copy_xstate_to_user() |
| Message-ID | <utTpF-2dI-21@gated-at.bofh.it> |
| In reply to | #1738014 |
Commit-ID: 656f083116a4799d8c0194976b8a2d66bf306538
Gitweb: http://git.kernel.org/tip/656f083116a4799d8c0194976b8a2d66bf306538
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Sat, 23 Sep 2017 14:59:44 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sun, 24 Sep 2017 13:04:30 +0200
x86/fpu: Rename copyin_to_xsaves()/copyout_from_xsaves() to copy_user_to_xstate()/copy_xstate_to_user()
The 'copyin/copyout' nomenclature needlessly departs from what the modern FPU code
uses, which is:
copy_fpregs_to_fpstate()
copy_fpstate_to_sigframe()
copy_fregs_to_user()
copy_fxregs_to_kernel()
copy_fxregs_to_user()
copy_kernel_to_fpregs()
copy_kernel_to_fregs()
copy_kernel_to_fxregs()
copy_kernel_to_xregs()
copy_user_to_fregs()
copy_user_to_fxregs()
copy_user_to_xregs()
copy_xregs_to_kernel()
copy_xregs_to_user()
I.e. according to this pattern, the following rename should be done:
copyin_to_xsaves() -> copy_user_to_xstate()
copyout_from_xsaves() -> copy_xstate_to_user()
or, if we want to be pedantic, denote that that the user-space format is ptrace:
copyin_to_xsaves() -> copy_user_ptrace_to_xstate()
copyout_from_xsaves() -> copy_xstate_to_user_ptrace()
But I'd suggest the shorter, non-pedantic name.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-2-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/fpu/xstate.h | 4 ++--
arch/x86/kernel/fpu/regset.c | 4 ++--
arch/x86/kernel/fpu/signal.c | 2 +-
arch/x86/kernel/fpu/xstate.c | 4 ++--
4 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index 1b2799e..a1baa17 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -48,8 +48,8 @@ void fpu__xstate_clear_all_cpu_caps(void);
void *get_xsave_addr(struct xregs_state *xsave, int xstate);
const void *get_xsave_field_ptr(int xstate_field);
int using_compacted_format(void);
-int copyout_from_xsaves(unsigned int pos, unsigned int count, void *kbuf,
+int copy_xstate_to_user(unsigned int pos, unsigned int count, void *kbuf,
void __user *ubuf, struct xregs_state *xsave);
-int copyin_to_xsaves(const void *kbuf, const void __user *ubuf,
+int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
struct xregs_state *xsave);
#endif
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index b188b16..165d054 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -92,7 +92,7 @@ int xstateregs_get(struct task_struct *target, const struct user_regset *regset,
fpu__activate_fpstate_read(fpu);
if (using_compacted_format()) {
- ret = copyout_from_xsaves(pos, count, kbuf, ubuf, xsave);
+ ret = copy_xstate_to_user(pos, count, kbuf, ubuf, xsave);
} else {
fpstate_sanitize_xstate(fpu);
/*
@@ -132,7 +132,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
fpu__activate_fpstate_write(fpu);
if (boot_cpu_has(X86_FEATURE_XSAVES))
- ret = copyin_to_xsaves(kbuf, ubuf, xsave);
+ ret = copy_user_to_xstate(kbuf, ubuf, xsave);
else
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, xsave, 0, -1);
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 83c23c2..b1fe9a1 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -324,7 +324,7 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
fpu__drop(fpu);
if (using_compacted_format()) {
- err = copyin_to_xsaves(NULL, buf_fx,
+ err = copy_user_to_xstate(NULL, buf_fx,
&fpu->state.xsave);
} else {
err = __copy_from_user(&fpu->state.xsave,
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index c24ac1e..e7bb417 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -951,7 +951,7 @@ static inline int xstate_copyout(unsigned int pos, unsigned int count,
* zero. This is called from xstateregs_get() and there we check the CPU
* has XSAVES.
*/
-int copyout_from_xsaves(unsigned int pos, unsigned int count, void *kbuf,
+int copy_xstate_to_user(unsigned int pos, unsigned int count, void *kbuf,
void __user *ubuf, struct xregs_state *xsave)
{
unsigned int offset, size;
@@ -1023,7 +1023,7 @@ int copyout_from_xsaves(unsigned int pos, unsigned int count, void *kbuf,
* there we check the CPU has XSAVES and a whole standard-sized buffer
* exists.
*/
-int copyin_to_xsaves(const void *kbuf, const void __user *ubuf,
+int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
struct xregs_state *xsave)
{
unsigned int offset, size;
[toc] | [prev] | [next] | [standalone]
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2017-09-23 15:10 +0200 |
| Subject | [PATCH 29/33] x86/fpu: Rename fpu::fpstate_active to fpu::initialized |
| Message-ID | <usSlY-3wU-37@gated-at.bofh.it> |
| In reply to | #1737999 |
The x86 FPU code used to have a complex state machine where both the FPU
registers and the FPU state context could be 'active' (or inactive)
independently of each other - which enabled features like lazy FPU restore.
Much of this complexity is gone in the current code: now we basically can
have FPU-less tasks (kernel threads) that don't use (and save/restore) FPU
state at all, plus full FPU users that save/restore directly with no laziness
whatsoever.
But the fpu::fpstate_active still carries bits of the old complexity - meanwhile
this flag has become a simple flag that shows whether the FPU context saving
area in the thread struct is initialized and used, or not.
Rename it to fpu::initialized to express this simplicity in the name as well.
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/ia32/ia32_signal.c | 2 +-
arch/x86/include/asm/fpu/internal.h | 4 ++--
arch/x86/include/asm/fpu/types.h | 6 +++---
arch/x86/include/asm/trace/fpu.h | 8 ++++----
arch/x86/kernel/fpu/core.c | 24 ++++++++++++------------
arch/x86/kernel/fpu/init.c | 2 +-
arch/x86/kernel/fpu/regset.c | 6 +++---
arch/x86/kernel/fpu/signal.c | 8 ++++----
arch/x86/kernel/fpu/xstate.c | 2 +-
arch/x86/kernel/signal.c | 6 +++---
arch/x86/mm/pkeys.c | 2 +-
11 files changed, 35 insertions(+), 35 deletions(-)
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index e0bb46c02857..0e2a5edbce00 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -231,7 +231,7 @@ static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
ksig->ka.sa.sa_restorer)
sp = (unsigned long) ksig->ka.sa.sa_restorer;
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
unsigned long fx_aligned, math_size;
sp = fpu__alloc_mathframe(sp, 1, &fx_aligned, &math_size);
diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 508e4181c4af..b26ae05da18a 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -527,7 +527,7 @@ static inline void fpregs_activate(struct fpu *fpu)
static inline void
switch_fpu_prepare(struct fpu *old_fpu, int cpu)
{
- if (old_fpu->fpstate_active) {
+ if (old_fpu->initialized) {
if (!copy_fpregs_to_fpstate(old_fpu))
old_fpu->last_cpu = -1;
else
@@ -550,7 +550,7 @@ switch_fpu_prepare(struct fpu *old_fpu, int cpu)
static inline void switch_fpu_finish(struct fpu *new_fpu, int cpu)
{
bool preload = static_cpu_has(X86_FEATURE_FPU) &&
- new_fpu->fpstate_active;
+ new_fpu->initialized;
if (preload) {
if (!fpregs_state_valid(new_fpu, cpu))
diff --git a/arch/x86/include/asm/fpu/types.h b/arch/x86/include/asm/fpu/types.h
index 71db45ca8870..a1520575d86b 100644
--- a/arch/x86/include/asm/fpu/types.h
+++ b/arch/x86/include/asm/fpu/types.h
@@ -293,13 +293,13 @@ struct fpu {
unsigned int last_cpu;
/*
- * @fpstate_active:
+ * @initialized:
*
- * This flag indicates whether this context is active: if the task
+ * This flag indicates whether this context is initialized: if the task
* is not running then we can restore from this context, if the task
* is running then we should save into this context.
*/
- unsigned char fpstate_active;
+ unsigned char initialized;
/*
* @state:
diff --git a/arch/x86/include/asm/trace/fpu.h b/arch/x86/include/asm/trace/fpu.h
index da565aae9fd2..39f7a27bef13 100644
--- a/arch/x86/include/asm/trace/fpu.h
+++ b/arch/x86/include/asm/trace/fpu.h
@@ -12,22 +12,22 @@ DECLARE_EVENT_CLASS(x86_fpu,
TP_STRUCT__entry(
__field(struct fpu *, fpu)
- __field(bool, fpstate_active)
+ __field(bool, initialized)
__field(u64, xfeatures)
__field(u64, xcomp_bv)
),
TP_fast_assign(
__entry->fpu = fpu;
- __entry->fpstate_active = fpu->fpstate_active;
+ __entry->initialized = fpu->initialized;
if (boot_cpu_has(X86_FEATURE_OSXSAVE)) {
__entry->xfeatures = fpu->state.xsave.header.xfeatures;
__entry->xcomp_bv = fpu->state.xsave.header.xcomp_bv;
}
),
- TP_printk("x86/fpu: %p fpstate_active: %d xfeatures: %llx xcomp_bv: %llx",
+ TP_printk("x86/fpu: %p initialized: %d xfeatures: %llx xcomp_bv: %llx",
__entry->fpu,
- __entry->fpstate_active,
+ __entry->initialized,
__entry->xfeatures,
__entry->xcomp_bv
)
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index c248ce5ceff4..d770f9a6d4e1 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -100,7 +100,7 @@ void __kernel_fpu_begin(void)
kernel_fpu_disable();
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
/*
* Ignore return value -- we don't care if reg state
* is clobbered.
@@ -116,7 +116,7 @@ void __kernel_fpu_end(void)
{
struct fpu *fpu = ¤t->thread.fpu;
- if (fpu->fpstate_active)
+ if (fpu->initialized)
copy_kernel_to_fpregs(&fpu->state);
kernel_fpu_enable();
@@ -148,7 +148,7 @@ void fpu__save(struct fpu *fpu)
preempt_disable();
trace_x86_fpu_before_save(fpu);
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
if (!copy_fpregs_to_fpstate(fpu)) {
copy_kernel_to_fpregs(&fpu->state);
}
@@ -191,7 +191,7 @@ int fpu__copy(struct fpu *dst_fpu, struct fpu *src_fpu)
{
dst_fpu->last_cpu = -1;
- if (!src_fpu->fpstate_active || !static_cpu_has(X86_FEATURE_FPU))
+ if (!src_fpu->initialized || !static_cpu_has(X86_FEATURE_FPU))
return 0;
WARN_ON_FPU(src_fpu != ¤t->thread.fpu);
@@ -240,13 +240,13 @@ void fpu__activate_curr(struct fpu *fpu)
{
WARN_ON_FPU(fpu != ¤t->thread.fpu);
- if (!fpu->fpstate_active) {
+ if (!fpu->initialized) {
fpstate_init(&fpu->state);
trace_x86_fpu_init_state(fpu);
trace_x86_fpu_activate_state(fpu);
/* Safe to do for the current task: */
- fpu->fpstate_active = 1;
+ fpu->initialized = 1;
}
}
EXPORT_SYMBOL_GPL(fpu__activate_curr);
@@ -261,13 +261,13 @@ void fpu__activate_fpstate_read(struct fpu *fpu)
{
WARN_ON_FPU(fpu == ¤t->thread.fpu);
- if (!fpu->fpstate_active) {
+ if (!fpu->initialized) {
fpstate_init(&fpu->state);
trace_x86_fpu_init_state(fpu);
trace_x86_fpu_activate_state(fpu);
/* Safe to do for current and for stopped child tasks: */
- fpu->fpstate_active = 1;
+ fpu->initialized = 1;
}
}
@@ -292,7 +292,7 @@ void fpu__activate_fpstate_write(struct fpu *fpu)
*/
WARN_ON_FPU(fpu == ¤t->thread.fpu);
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
/* Invalidate any lazy state: */
__fpu_invalidate_fpregs_state(fpu);
} else {
@@ -301,7 +301,7 @@ void fpu__activate_fpstate_write(struct fpu *fpu)
trace_x86_fpu_activate_state(fpu);
/* Safe to do for stopped child tasks: */
- fpu->fpstate_active = 1;
+ fpu->initialized = 1;
}
}
@@ -343,7 +343,7 @@ void fpu__drop(struct fpu *fpu)
preempt_disable();
if (fpu == ¤t->thread.fpu) {
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
/* Ignore delayed exceptions from user space */
asm volatile("1: fwait\n"
"2:\n"
@@ -352,7 +352,7 @@ void fpu__drop(struct fpu *fpu)
}
}
- fpu->fpstate_active = 0;
+ fpu->initialized = 0;
trace_x86_fpu_dropped(fpu);
diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c
index d5d44c452624..7affb7e3d9a5 100644
--- a/arch/x86/kernel/fpu/init.c
+++ b/arch/x86/kernel/fpu/init.c
@@ -240,7 +240,7 @@ static void __init fpu__init_system_ctx_switch(void)
WARN_ON_FPU(!on_boot_cpu);
on_boot_cpu = 0;
- WARN_ON_FPU(current->thread.fpu.fpstate_active);
+ WARN_ON_FPU(current->thread.fpu.initialized);
}
/*
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index 0467e536b0a2..5c2a051baeac 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -16,14 +16,14 @@ int regset_fpregs_active(struct task_struct *target, const struct user_regset *r
{
struct fpu *target_fpu = &target->thread.fpu;
- return target_fpu->fpstate_active ? regset->n : 0;
+ return target_fpu->initialized ? regset->n : 0;
}
int regset_xregset_fpregs_active(struct task_struct *target, const struct user_regset *regset)
{
struct fpu *target_fpu = &target->thread.fpu;
- if (boot_cpu_has(X86_FEATURE_FXSR) && target_fpu->fpstate_active)
+ if (boot_cpu_has(X86_FEATURE_FXSR) && target_fpu->initialized)
return regset->n;
else
return 0;
@@ -373,7 +373,7 @@ int dump_fpu(struct pt_regs *regs, struct user_i387_struct *ufpu)
struct fpu *fpu = &tsk->thread.fpu;
int fpvalid;
- fpvalid = fpu->fpstate_active;
+ fpvalid = fpu->initialized;
if (fpvalid)
fpvalid = !fpregs_get(tsk, NULL,
0, sizeof(struct user_i387_ia32_struct),
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 5b5d75e3b2a4..34c9a85eb5ba 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -171,7 +171,7 @@ int copy_fpstate_to_sigframe(void __user *buf, void __user *buf_fx, int size)
sizeof(struct user_i387_ia32_struct), NULL,
(struct _fpstate_32 __user *) buf) ? -1 : 1;
- if (fpu->fpstate_active || using_compacted_format()) {
+ if (fpu->initialized || using_compacted_format()) {
/* Save the live register state to the user directly. */
if (copy_fpregs_to_sigframe(buf_fx))
return -1;
@@ -318,12 +318,12 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
int err = 0;
/*
- * Drop the current fpu which clears fpu->fpstate_active. This ensures
+ * Drop the current fpu which clears fpu->initialized. This ensures
* that any context-switch during the copy of the new state,
* avoids the intermediate state from getting restored/saved.
* Thus avoiding the new restored state from getting corrupted.
* We will be ready to restore/save the state only after
- * fpu->fpstate_active is again set.
+ * fpu->initialized is again set.
*/
fpu__drop(fpu);
@@ -343,7 +343,7 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
sanitize_restored_xstate(tsk, &env, xfeatures, fx_only);
}
- fpu->fpstate_active = 1;
+ fpu->initialized = 1;
preempt_disable();
fpu__restore(fpu);
preempt_enable();
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index d5150163a0df..7ebd1a0811b6 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -867,7 +867,7 @@ const void *get_xsave_field_ptr(int xsave_state)
{
struct fpu *fpu = ¤t->thread.fpu;
- if (!fpu->fpstate_active)
+ if (!fpu->initialized)
return NULL;
/*
* fpu__save() takes the CPU's xstate registers
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index e04442345fc0..4e188fda5961 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -263,7 +263,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
sp = (unsigned long) ka->sa.sa_restorer;
}
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
sp = fpu__alloc_mathframe(sp, IS_ENABLED(CONFIG_X86_32),
&buf_fx, &math_size);
*fpstate = (void __user *)sp;
@@ -279,7 +279,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
return (void __user *)-1L;
/* save i387 and extended state */
- if (fpu->fpstate_active &&
+ if (fpu->initialized &&
copy_fpstate_to_sigframe(*fpstate, (void __user *)buf_fx, math_size) < 0)
return (void __user *)-1L;
@@ -755,7 +755,7 @@ handle_signal(struct ksignal *ksig, struct pt_regs *regs)
/*
* Ensure the signal handler starts with the new fpu state.
*/
- if (fpu->fpstate_active)
+ if (fpu->initialized)
fpu__clear(fpu);
}
signal_setup_done(failed, ksig, stepping);
diff --git a/arch/x86/mm/pkeys.c b/arch/x86/mm/pkeys.c
index 4d24269c071f..d7bc0eea20a5 100644
--- a/arch/x86/mm/pkeys.c
+++ b/arch/x86/mm/pkeys.c
@@ -44,7 +44,7 @@ int __execute_only_pkey(struct mm_struct *mm)
*/
preempt_disable();
if (!need_to_set_mm_pkey &&
- current->thread.fpu.fpstate_active &&
+ current->thread.fpu.initialized &&
!__pkru_allows_read(read_pkru(), execute_only_pkey)) {
preempt_enable();
return execute_only_pkey;
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | tip-bot for Ingo Molnar <tipbot@zytor.com> |
|---|---|
| Date | 2017-09-26 10:50 +0200 |
| Subject | [tip:x86/fpu] x86/fpu: Rename fpu::fpstate_active to fpu::initialized |
| Message-ID | <utTJ1-2nL-45@gated-at.bofh.it> |
| In reply to | #1738015 |
Commit-ID: e4a81bfcaae1ebbdc6efe74e8ea563144d90e9a9
Gitweb: http://git.kernel.org/tip/e4a81bfcaae1ebbdc6efe74e8ea563144d90e9a9
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Tue, 26 Sep 2017 09:43:36 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 26 Sep 2017 09:43:36 +0200
x86/fpu: Rename fpu::fpstate_active to fpu::initialized
The x86 FPU code used to have a complex state machine where both the FPU
registers and the FPU state context could be 'active' (or inactive)
independently of each other - which enabled features like lazy FPU restore.
Much of this complexity is gone in the current code: now we basically can
have FPU-less tasks (kernel threads) that don't use (and save/restore) FPU
state at all, plus full FPU users that save/restore directly with no laziness
whatsoever.
But the fpu::fpstate_active still carries bits of the old complexity - meanwhile
this flag has become a simple flag that shows whether the FPU context saving
area in the thread struct is initialized and used, or not.
Rename it to fpu::initialized to express this simplicity in the name as well.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-30-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/ia32/ia32_signal.c | 2 +-
arch/x86/include/asm/fpu/internal.h | 4 ++--
arch/x86/include/asm/fpu/types.h | 6 +++---
arch/x86/include/asm/trace/fpu.h | 8 ++++----
arch/x86/kernel/fpu/core.c | 24 ++++++++++++------------
arch/x86/kernel/fpu/init.c | 2 +-
arch/x86/kernel/fpu/regset.c | 6 +++---
arch/x86/kernel/fpu/signal.c | 8 ++++----
arch/x86/kernel/fpu/xstate.c | 2 +-
arch/x86/kernel/signal.c | 6 +++---
arch/x86/mm/pkeys.c | 2 +-
11 files changed, 35 insertions(+), 35 deletions(-)
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index e0bb46c..0e2a5ed 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -231,7 +231,7 @@ static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
ksig->ka.sa.sa_restorer)
sp = (unsigned long) ksig->ka.sa.sa_restorer;
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
unsigned long fx_aligned, math_size;
sp = fpu__alloc_mathframe(sp, 1, &fx_aligned, &math_size);
diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 508e418..b26ae05 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -527,7 +527,7 @@ static inline void fpregs_activate(struct fpu *fpu)
static inline void
switch_fpu_prepare(struct fpu *old_fpu, int cpu)
{
- if (old_fpu->fpstate_active) {
+ if (old_fpu->initialized) {
if (!copy_fpregs_to_fpstate(old_fpu))
old_fpu->last_cpu = -1;
else
@@ -550,7 +550,7 @@ switch_fpu_prepare(struct fpu *old_fpu, int cpu)
static inline void switch_fpu_finish(struct fpu *new_fpu, int cpu)
{
bool preload = static_cpu_has(X86_FEATURE_FPU) &&
- new_fpu->fpstate_active;
+ new_fpu->initialized;
if (preload) {
if (!fpregs_state_valid(new_fpu, cpu))
diff --git a/arch/x86/include/asm/fpu/types.h b/arch/x86/include/asm/fpu/types.h
index 71db45c..a152057 100644
--- a/arch/x86/include/asm/fpu/types.h
+++ b/arch/x86/include/asm/fpu/types.h
@@ -293,13 +293,13 @@ struct fpu {
unsigned int last_cpu;
/*
- * @fpstate_active:
+ * @initialized:
*
- * This flag indicates whether this context is active: if the task
+ * This flag indicates whether this context is initialized: if the task
* is not running then we can restore from this context, if the task
* is running then we should save into this context.
*/
- unsigned char fpstate_active;
+ unsigned char initialized;
/*
* @state:
diff --git a/arch/x86/include/asm/trace/fpu.h b/arch/x86/include/asm/trace/fpu.h
index da565aa..39f7a27 100644
--- a/arch/x86/include/asm/trace/fpu.h
+++ b/arch/x86/include/asm/trace/fpu.h
@@ -12,22 +12,22 @@ DECLARE_EVENT_CLASS(x86_fpu,
TP_STRUCT__entry(
__field(struct fpu *, fpu)
- __field(bool, fpstate_active)
+ __field(bool, initialized)
__field(u64, xfeatures)
__field(u64, xcomp_bv)
),
TP_fast_assign(
__entry->fpu = fpu;
- __entry->fpstate_active = fpu->fpstate_active;
+ __entry->initialized = fpu->initialized;
if (boot_cpu_has(X86_FEATURE_OSXSAVE)) {
__entry->xfeatures = fpu->state.xsave.header.xfeatures;
__entry->xcomp_bv = fpu->state.xsave.header.xcomp_bv;
}
),
- TP_printk("x86/fpu: %p fpstate_active: %d xfeatures: %llx xcomp_bv: %llx",
+ TP_printk("x86/fpu: %p initialized: %d xfeatures: %llx xcomp_bv: %llx",
__entry->fpu,
- __entry->fpstate_active,
+ __entry->initialized,
__entry->xfeatures,
__entry->xcomp_bv
)
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index b2cdeb3..c8d6032 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -100,7 +100,7 @@ void __kernel_fpu_begin(void)
kernel_fpu_disable();
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
/*
* Ignore return value -- we don't care if reg state
* is clobbered.
@@ -116,7 +116,7 @@ void __kernel_fpu_end(void)
{
struct fpu *fpu = ¤t->thread.fpu;
- if (fpu->fpstate_active)
+ if (fpu->initialized)
copy_kernel_to_fpregs(&fpu->state);
kernel_fpu_enable();
@@ -148,7 +148,7 @@ void fpu__save(struct fpu *fpu)
preempt_disable();
trace_x86_fpu_before_save(fpu);
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
if (!copy_fpregs_to_fpstate(fpu)) {
copy_kernel_to_fpregs(&fpu->state);
}
@@ -191,7 +191,7 @@ int fpu__copy(struct fpu *dst_fpu, struct fpu *src_fpu)
{
dst_fpu->last_cpu = -1;
- if (!src_fpu->fpstate_active || !static_cpu_has(X86_FEATURE_FPU))
+ if (!src_fpu->initialized || !static_cpu_has(X86_FEATURE_FPU))
return 0;
WARN_ON_FPU(src_fpu != ¤t->thread.fpu);
@@ -240,13 +240,13 @@ void fpu__activate_curr(struct fpu *fpu)
{
WARN_ON_FPU(fpu != ¤t->thread.fpu);
- if (!fpu->fpstate_active) {
+ if (!fpu->initialized) {
fpstate_init(&fpu->state);
trace_x86_fpu_init_state(fpu);
trace_x86_fpu_activate_state(fpu);
/* Safe to do for the current task: */
- fpu->fpstate_active = 1;
+ fpu->initialized = 1;
}
}
EXPORT_SYMBOL_GPL(fpu__activate_curr);
@@ -271,13 +271,13 @@ void fpu__activate_fpstate_read(struct fpu *fpu)
if (fpu == ¤t->thread.fpu) {
fpu__save(fpu);
} else {
- if (!fpu->fpstate_active) {
+ if (!fpu->initialized) {
fpstate_init(&fpu->state);
trace_x86_fpu_init_state(fpu);
trace_x86_fpu_activate_state(fpu);
/* Safe to do for current and for stopped child tasks: */
- fpu->fpstate_active = 1;
+ fpu->initialized = 1;
}
}
}
@@ -303,7 +303,7 @@ void fpu__activate_fpstate_write(struct fpu *fpu)
*/
WARN_ON_FPU(fpu == ¤t->thread.fpu);
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
/* Invalidate any lazy state: */
__fpu_invalidate_fpregs_state(fpu);
} else {
@@ -312,7 +312,7 @@ void fpu__activate_fpstate_write(struct fpu *fpu)
trace_x86_fpu_activate_state(fpu);
/* Safe to do for stopped child tasks: */
- fpu->fpstate_active = 1;
+ fpu->initialized = 1;
}
}
@@ -354,7 +354,7 @@ void fpu__drop(struct fpu *fpu)
preempt_disable();
if (fpu == ¤t->thread.fpu) {
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
/* Ignore delayed exceptions from user space */
asm volatile("1: fwait\n"
"2:\n"
@@ -363,7 +363,7 @@ void fpu__drop(struct fpu *fpu)
}
}
- fpu->fpstate_active = 0;
+ fpu->initialized = 0;
trace_x86_fpu_dropped(fpu);
diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c
index d5d44c4..7affb7e 100644
--- a/arch/x86/kernel/fpu/init.c
+++ b/arch/x86/kernel/fpu/init.c
@@ -240,7 +240,7 @@ static void __init fpu__init_system_ctx_switch(void)
WARN_ON_FPU(!on_boot_cpu);
on_boot_cpu = 0;
- WARN_ON_FPU(current->thread.fpu.fpstate_active);
+ WARN_ON_FPU(current->thread.fpu.initialized);
}
/*
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index c764f74..19e82334 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -16,14 +16,14 @@ int regset_fpregs_active(struct task_struct *target, const struct user_regset *r
{
struct fpu *target_fpu = &target->thread.fpu;
- return target_fpu->fpstate_active ? regset->n : 0;
+ return target_fpu->initialized ? regset->n : 0;
}
int regset_xregset_fpregs_active(struct task_struct *target, const struct user_regset *regset)
{
struct fpu *target_fpu = &target->thread.fpu;
- if (boot_cpu_has(X86_FEATURE_FXSR) && target_fpu->fpstate_active)
+ if (boot_cpu_has(X86_FEATURE_FXSR) && target_fpu->initialized)
return regset->n;
else
return 0;
@@ -380,7 +380,7 @@ int dump_fpu(struct pt_regs *regs, struct user_i387_struct *ufpu)
struct fpu *fpu = &tsk->thread.fpu;
int fpvalid;
- fpvalid = fpu->fpstate_active;
+ fpvalid = fpu->initialized;
if (fpvalid)
fpvalid = !fpregs_get(tsk, NULL,
0, sizeof(struct user_i387_ia32_struct),
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index da68ea1..ab2dd24 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -171,7 +171,7 @@ int copy_fpstate_to_sigframe(void __user *buf, void __user *buf_fx, int size)
sizeof(struct user_i387_ia32_struct), NULL,
(struct _fpstate_32 __user *) buf) ? -1 : 1;
- if (fpu->fpstate_active || using_compacted_format()) {
+ if (fpu->initialized || using_compacted_format()) {
/* Save the live register state to the user directly. */
if (copy_fpregs_to_sigframe(buf_fx))
return -1;
@@ -315,12 +315,12 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
int err = 0;
/*
- * Drop the current fpu which clears fpu->fpstate_active. This ensures
+ * Drop the current fpu which clears fpu->initialized. This ensures
* that any context-switch during the copy of the new state,
* avoids the intermediate state from getting restored/saved.
* Thus avoiding the new restored state from getting corrupted.
* We will be ready to restore/save the state only after
- * fpu->fpstate_active is again set.
+ * fpu->initialized is again set.
*/
fpu__drop(fpu);
@@ -342,7 +342,7 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
sanitize_restored_xstate(tsk, &env, xfeatures, fx_only);
}
- fpu->fpstate_active = 1;
+ fpu->initialized = 1;
preempt_disable();
fpu__restore(fpu);
preempt_enable();
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index fda1109..703e76d 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -867,7 +867,7 @@ const void *get_xsave_field_ptr(int xsave_state)
{
struct fpu *fpu = ¤t->thread.fpu;
- if (!fpu->fpstate_active)
+ if (!fpu->initialized)
return NULL;
/*
* fpu__save() takes the CPU's xstate registers
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index e044423..4e188fd 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -263,7 +263,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
sp = (unsigned long) ka->sa.sa_restorer;
}
- if (fpu->fpstate_active) {
+ if (fpu->initialized) {
sp = fpu__alloc_mathframe(sp, IS_ENABLED(CONFIG_X86_32),
&buf_fx, &math_size);
*fpstate = (void __user *)sp;
@@ -279,7 +279,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
return (void __user *)-1L;
/* save i387 and extended state */
- if (fpu->fpstate_active &&
+ if (fpu->initialized &&
copy_fpstate_to_sigframe(*fpstate, (void __user *)buf_fx, math_size) < 0)
return (void __user *)-1L;
@@ -755,7 +755,7 @@ handle_signal(struct ksignal *ksig, struct pt_regs *regs)
/*
* Ensure the signal handler starts with the new fpu state.
*/
- if (fpu->fpstate_active)
+ if (fpu->initialized)
fpu__clear(fpu);
}
signal_setup_done(failed, ksig, stepping);
diff --git a/arch/x86/mm/pkeys.c b/arch/x86/mm/pkeys.c
index 4d24269..d7bc0eea 100644
--- a/arch/x86/mm/pkeys.c
+++ b/arch/x86/mm/pkeys.c
@@ -44,7 +44,7 @@ int __execute_only_pkey(struct mm_struct *mm)
*/
preempt_disable();
if (!need_to_set_mm_pkey &&
- current->thread.fpu.fpstate_active &&
+ current->thread.fpu.initialized &&
!__pkru_allows_read(read_pkru(), execute_only_pkey)) {
preempt_enable();
return execute_only_pkey;
[toc] | [prev] | [next] | [standalone]
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2017-09-23 15:10 +0200 |
| Subject | [PATCH 17/33] x86/fpu: Split the state handling in fpu__drop() |
| Message-ID | <usSlY-3wU-31@gated-at.bofh.it> |
| In reply to | #1737999 |
Prepare fpu__drop() to use fpu->fpregs_active.
There are two distinct usecases for fpu__drop() in this context:
exit_thread() when called for 'current' in exit(), and when called
for another task in fork().
This patch does not change behavior, it only adds a couple of
debug checks and structures the code to make the ->fpregs_active
change more obviously correct.
All the complications will be removed later on.
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/fpu/core.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index b7dc3833d41a..815dfba7781a 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -414,12 +414,19 @@ void fpu__drop(struct fpu *fpu)
{
preempt_disable();
- if (fpu->fpregs_active) {
- /* Ignore delayed exceptions from user space */
- asm volatile("1: fwait\n"
- "2:\n"
- _ASM_EXTABLE(1b, 2b));
- fpregs_deactivate(fpu);
+ if (fpu == ¤t->thread.fpu) {
+ WARN_ON_FPU(fpu->fpstate_active != fpu->fpregs_active);
+
+ if (fpu->fpregs_active) {
+ /* Ignore delayed exceptions from user space */
+ asm volatile("1: fwait\n"
+ "2:\n"
+ _ASM_EXTABLE(1b, 2b));
+ if (fpu->fpregs_active)
+ fpregs_deactivate(fpu);
+ }
+ } else {
+ WARN_ON_FPU(fpu->fpregs_active);
}
fpu->fpstate_active = 0;
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | tip-bot for Ingo Molnar <tipbot@zytor.com> |
|---|---|
| Date | 2017-09-26 10:40 +0200 |
| Subject | [tip:x86/fpu] x86/fpu: Split the state handling in fpu__drop() |
| Message-ID | <utTzl-2jm-39@gated-at.bofh.it> |
| In reply to | #1738016 |
Commit-ID: b6aa85558d7e7b18fc3470d2bc1731d2205dd275
Gitweb: http://git.kernel.org/tip/b6aa85558d7e7b18fc3470d2bc1731d2205dd275
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Sat, 23 Sep 2017 15:00:00 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sun, 24 Sep 2017 13:04:34 +0200
x86/fpu: Split the state handling in fpu__drop()
Prepare fpu__drop() to use fpu->fpregs_active.
There are two distinct usecases for fpu__drop() in this context:
exit_thread() when called for 'current' in exit(), and when called
for another task in fork().
This patch does not change behavior, it only adds a couple of
debug checks and structures the code to make the ->fpregs_active
change more obviously correct.
All the complications will be removed later on.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-18-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/fpu/core.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index b7dc383..815dfba 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -414,12 +414,19 @@ void fpu__drop(struct fpu *fpu)
{
preempt_disable();
- if (fpu->fpregs_active) {
- /* Ignore delayed exceptions from user space */
- asm volatile("1: fwait\n"
- "2:\n"
- _ASM_EXTABLE(1b, 2b));
- fpregs_deactivate(fpu);
+ if (fpu == ¤t->thread.fpu) {
+ WARN_ON_FPU(fpu->fpstate_active != fpu->fpregs_active);
+
+ if (fpu->fpregs_active) {
+ /* Ignore delayed exceptions from user space */
+ asm volatile("1: fwait\n"
+ "2:\n"
+ _ASM_EXTABLE(1b, 2b));
+ if (fpu->fpregs_active)
+ fpregs_deactivate(fpu);
+ }
+ } else {
+ WARN_ON_FPU(fpu->fpregs_active);
}
fpu->fpstate_active = 0;
[toc] | [prev] | [next] | [standalone]
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2017-09-23 15:10 +0200 |
| Subject | [PATCH 09/33] x86/fpu: Change 'size_total' parameter to unsigned and standardize the size checks in copy_xstate_to_*() |
| Message-ID | <usSlZ-3wU-43@gated-at.bofh.it> |
| In reply to | #1737999 |
'size_total' is derived from an unsigned input parameter - and then converted
to 'int' and checked for negative ranges:
if (size_total < 0 || offset < size_total) {
This conversion and the checks are unnecessary obfuscation, reject overly
large requested copy sizes outright and simplify the underlying code.
Reported-by: Rik van Riel <riel@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/fpu/xstate.c | 32 +++++++++++++++-----------------
1 file changed, 15 insertions(+), 17 deletions(-)
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index c13083579655..b18c5457065a 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -925,15 +925,11 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
* the source data pointer or increment pos, count, kbuf, and ubuf.
*/
static inline int
-__copy_xstate_to_kernel(void *kbuf,
- const void *data,
- unsigned int offset, unsigned int size, int size_total)
+__copy_xstate_to_kernel(void *kbuf, const void *data,
+ unsigned int offset, unsigned int size, unsigned int size_total)
{
- if (!size)
- return 0;
-
- if (size_total < 0 || offset < size_total) {
- unsigned int copy = size_total < 0 ? size : min(size, size_total - offset);
+ if (offset < size_total) {
+ unsigned int copy = min(size, size_total - offset);
memcpy(kbuf + offset, data, copy);
}
@@ -986,12 +982,13 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int of
offset = xstate_offsets[i];
size = xstate_sizes[i];
+ /* The next component has to fit fully into the output buffer: */
+ if (offset + size > size_total)
+ break;
+
ret = __copy_xstate_to_kernel(kbuf, src, offset, size, size_total);
if (ret)
return ret;
-
- if (offset + size >= size_total)
- break;
}
}
@@ -1010,13 +1007,13 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int of
}
static inline int
-__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int offset, unsigned int size, int size_total)
+__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int offset, unsigned int size, unsigned int size_total)
{
if (!size)
return 0;
- if (size_total < 0 || offset < size_total) {
- unsigned int copy = size_total < 0 ? size : min(size, size_total - offset);
+ if (offset < size_total) {
+ unsigned int copy = min(size, size_total - offset);
if (__copy_to_user(ubuf + offset, data, copy))
return -EFAULT;
@@ -1069,12 +1066,13 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = xstate_offsets[i];
size = xstate_sizes[i];
+ /* The next component has to fit fully into the output buffer: */
+ if (offset + size > size_total)
+ break;
+
ret = __copy_xstate_to_user(ubuf, src, offset, size, size_total);
if (ret)
return ret;
-
- if (offset + size >= size_total)
- break;
}
}
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | tip-bot for Ingo Molnar <tipbot@zytor.com> |
|---|---|
| Date | 2017-09-26 10:40 +0200 |
| Subject | [tip:x86/fpu] x86/fpu: Change 'size_total' parameter to unsigned and standardize the size checks in copy_xstate_to_*() |
| Message-ID | <utTzn-2jm-89@gated-at.bofh.it> |
| In reply to | #1738017 |
Commit-ID: 6ff15f8db7eaf29ef5ead6afbec9b25485fe8703
Gitweb: http://git.kernel.org/tip/6ff15f8db7eaf29ef5ead6afbec9b25485fe8703
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Sat, 23 Sep 2017 14:59:52 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sun, 24 Sep 2017 13:04:32 +0200
x86/fpu: Change 'size_total' parameter to unsigned and standardize the size checks in copy_xstate_to_*()
'size_total' is derived from an unsigned input parameter - and then converted
to 'int' and checked for negative ranges:
if (size_total < 0 || offset < size_total) {
This conversion and the checks are unnecessary obfuscation, reject overly
large requested copy sizes outright and simplify the underlying code.
Reported-by: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-10-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/fpu/xstate.c | 32 +++++++++++++++-----------------
1 file changed, 15 insertions(+), 17 deletions(-)
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index c130835..b18c545 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -925,15 +925,11 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
* the source data pointer or increment pos, count, kbuf, and ubuf.
*/
static inline int
-__copy_xstate_to_kernel(void *kbuf,
- const void *data,
- unsigned int offset, unsigned int size, int size_total)
+__copy_xstate_to_kernel(void *kbuf, const void *data,
+ unsigned int offset, unsigned int size, unsigned int size_total)
{
- if (!size)
- return 0;
-
- if (size_total < 0 || offset < size_total) {
- unsigned int copy = size_total < 0 ? size : min(size, size_total - offset);
+ if (offset < size_total) {
+ unsigned int copy = min(size, size_total - offset);
memcpy(kbuf + offset, data, copy);
}
@@ -986,12 +982,13 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int of
offset = xstate_offsets[i];
size = xstate_sizes[i];
+ /* The next component has to fit fully into the output buffer: */
+ if (offset + size > size_total)
+ break;
+
ret = __copy_xstate_to_kernel(kbuf, src, offset, size, size_total);
if (ret)
return ret;
-
- if (offset + size >= size_total)
- break;
}
}
@@ -1010,13 +1007,13 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int of
}
static inline int
-__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int offset, unsigned int size, int size_total)
+__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int offset, unsigned int size, unsigned int size_total)
{
if (!size)
return 0;
- if (size_total < 0 || offset < size_total) {
- unsigned int copy = size_total < 0 ? size : min(size, size_total - offset);
+ if (offset < size_total) {
+ unsigned int copy = min(size, size_total - offset);
if (__copy_to_user(ubuf + offset, data, copy))
return -EFAULT;
@@ -1069,12 +1066,13 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = xstate_offsets[i];
size = xstate_sizes[i];
+ /* The next component has to fit fully into the output buffer: */
+ if (offset + size > size_total)
+ break;
+
ret = __copy_xstate_to_user(ubuf, src, offset, size, size_total);
if (ret)
return ret;
-
- if (offset + size >= size_total)
- break;
}
}
[toc] | [prev] | [next] | [standalone]
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2017-09-23 15:10 +0200 |
| Subject | [PATCH 30/33] x86/fpu: Fix stale comments about lazy FPU logic |
| Message-ID | <usSlY-3wU-33@gated-at.bofh.it> |
| In reply to | #1737999 |
We don't do any lazy restore anymore, what we have are two pieces of optimization:
- no-FPU tasks that don't save/restore the FPU context (kernel threads are such)
- cached FPU registers maintained via the fpu->last_cpu field. This means that
if an FPU task context switches to a non-FPU task then we can maintain the
FPU registers as an in-FPU copies (cache), and skip the restoration of them
once we switch back to the original FPU-using task.
Update all the comments that still referred to old 'lazy' and 'unlazy' concepts.
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/fpu/core.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index d770f9a6d4e1..4acfc0ebc160 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -205,9 +205,6 @@ int fpu__copy(struct fpu *dst_fpu, struct fpu *src_fpu)
/*
* Save current FPU registers directly into the child
* FPU context, without any memory-to-memory copying.
- * In lazy mode, if the FPU context isn't loaded into
- * fpregs, CR0.TS will be set and do_device_not_available
- * will load the FPU context.
*
* We have to do all this with preemption disabled,
* mostly because of the FNSAVE case, because in that
@@ -274,13 +271,13 @@ void fpu__activate_fpstate_read(struct fpu *fpu)
/*
* This function must be called before we write a task's fpstate.
*
- * If the task has used the FPU before then unlazy it.
+ * If the task has used the FPU before then invalidate any cached FPU registers.
* If the task has not used the FPU before then initialize its fpstate.
*
* After this function call, after registers in the fpstate are
* modified and the child task has woken up, the child task will
* restore the modified FPU state from the modified context. If we
- * didn't clear its lazy status here then the lazy in-registers
+ * didn't clear its cached status here then the cached in-registers
* state pending on its former CPU could be restored, corrupting
* the modifications.
*/
@@ -293,7 +290,7 @@ void fpu__activate_fpstate_write(struct fpu *fpu)
WARN_ON_FPU(fpu == ¤t->thread.fpu);
if (fpu->initialized) {
- /* Invalidate any lazy state: */
+ /* Invalidate any cached state: */
__fpu_invalidate_fpregs_state(fpu);
} else {
fpstate_init(&fpu->state);
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | tip-bot for Ingo Molnar <tipbot@zytor.com> |
|---|---|
| Date | 2017-09-26 10:50 +0200 |
| Subject | [tip:x86/fpu] x86/fpu: Fix stale comments about lazy FPU logic |
| Message-ID | <utTIZ-2nL-1@gated-at.bofh.it> |
| In reply to | #1738018 |
Commit-ID: 7f1487c59b7c6dcb20155f4302985da2659a2997
Gitweb: http://git.kernel.org/tip/7f1487c59b7c6dcb20155f4302985da2659a2997
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Sat, 23 Sep 2017 15:00:13 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 26 Sep 2017 09:43:43 +0200
x86/fpu: Fix stale comments about lazy FPU logic
We don't do any lazy restore anymore, what we have are two pieces of optimization:
- no-FPU tasks that don't save/restore the FPU context (kernel threads are such)
- cached FPU registers maintained via the fpu->last_cpu field. This means that
if an FPU task context switches to a non-FPU task then we can maintain the
FPU registers as an in-FPU copies (cache), and skip the restoration of them
once we switch back to the original FPU-using task.
Update all the comments that still referred to old 'lazy' and 'unlazy' concepts.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-31-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/fpu/core.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index c8d6032..77668d9 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -205,9 +205,6 @@ int fpu__copy(struct fpu *dst_fpu, struct fpu *src_fpu)
/*
* Save current FPU registers directly into the child
* FPU context, without any memory-to-memory copying.
- * In lazy mode, if the FPU context isn't loaded into
- * fpregs, CR0.TS will be set and do_device_not_available
- * will load the FPU context.
*
* We have to do all this with preemption disabled,
* mostly because of the FNSAVE case, because in that
@@ -285,13 +282,13 @@ void fpu__activate_fpstate_read(struct fpu *fpu)
/*
* This function must be called before we write a task's fpstate.
*
- * If the task has used the FPU before then unlazy it.
+ * If the task has used the FPU before then invalidate any cached FPU registers.
* If the task has not used the FPU before then initialize its fpstate.
*
* After this function call, after registers in the fpstate are
* modified and the child task has woken up, the child task will
* restore the modified FPU state from the modified context. If we
- * didn't clear its lazy status here then the lazy in-registers
+ * didn't clear its cached status here then the cached in-registers
* state pending on its former CPU could be restored, corrupting
* the modifications.
*/
@@ -304,7 +301,7 @@ void fpu__activate_fpstate_write(struct fpu *fpu)
WARN_ON_FPU(fpu == ¤t->thread.fpu);
if (fpu->initialized) {
- /* Invalidate any lazy state: */
+ /* Invalidate any cached state: */
__fpu_invalidate_fpregs_state(fpu);
} else {
fpstate_init(&fpu->state);
[toc] | [prev] | [next] | [standalone]
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2017-09-23 15:10 +0200 |
| Subject | [PATCH 08/33] x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods |
| Message-ID | <usSlY-3wU-39@gated-at.bofh.it> |
| In reply to | #1737999 |
Right now there's a confusing mixture of 'offset' and 'size' parameters:
- __copy_xstate_to_*() input parameter 'end_pos' not not really an offset,
but the full size of the copy to be performed.
- input parameter 'count' to copy_xstate_to_*() shadows that of
__copy_xstate_to_*()'s 'count' parameter name - but the roles
are different: the first one is the total number of bytes to
be copied, while the second one is a partial copy size.
To unconfuse all this, use a consistent set of parameter names:
- 'size' is the partial copy size within a single xstate component
- 'size_total' is the total copy requested
- 'offset_start' is the requested starting offset.
- 'offset' is the offset within an xstate component.
No change in functionality.
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/fpu/xstate.h | 4 ++--
arch/x86/kernel/fpu/xstate.c | 44 ++++++++++++++++++++++----------------------
2 files changed, 24 insertions(+), 24 deletions(-)
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index e4430b84939d..fed6617a1079 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -48,8 +48,8 @@ void fpu__xstate_clear_all_cpu_caps(void);
void *get_xsave_addr(struct xregs_state *xsave, int xstate);
const void *get_xsave_field_ptr(int xstate_field);
int using_compacted_format(void);
-int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int pos, unsigned int count);
-int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int pos, unsigned int count);
+int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
+int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
struct xregs_state *xsave);
#endif
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 1f50fdaf4c5a..c13083579655 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -927,15 +927,15 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
static inline int
__copy_xstate_to_kernel(void *kbuf,
const void *data,
- unsigned int pos, unsigned int count, int end_pos)
+ unsigned int offset, unsigned int size, int size_total)
{
- if (!count)
+ if (!size)
return 0;
- if (end_pos < 0 || pos < end_pos) {
- unsigned int copy = end_pos < 0 ? count : min(count, end_pos - pos);
+ if (size_total < 0 || offset < size_total) {
+ unsigned int copy = size_total < 0 ? size : min(size, size_total - offset);
- memcpy(kbuf + pos, data, copy);
+ memcpy(kbuf + offset, data, copy);
}
return 0;
}
@@ -947,7 +947,7 @@ __copy_xstate_to_kernel(void *kbuf,
* It supports partial copy but pos always starts from zero. This is called
* from xstateregs_get() and there we check the CPU has XSAVES.
*/
-int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int pos, unsigned int count)
+int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset_start, unsigned int size_total)
{
unsigned int offset, size;
int ret, i;
@@ -956,7 +956,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
/*
* Currently copy_regset_to_user() starts from pos 0:
*/
- if (unlikely(pos != 0))
+ if (unlikely(offset_start != 0))
return -EFAULT;
/*
@@ -972,7 +972,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = offsetof(struct xregs_state, header);
size = sizeof(header);
- ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, count);
+ ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, size_total);
if (ret)
return ret;
@@ -986,11 +986,11 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = xstate_offsets[i];
size = xstate_sizes[i];
- ret = __copy_xstate_to_kernel(kbuf, src, offset, size, count);
+ ret = __copy_xstate_to_kernel(kbuf, src, offset, size, size_total);
if (ret)
return ret;
- if (offset + size >= count)
+ if (offset + size >= size_total)
break;
}
@@ -1002,7 +1002,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = offsetof(struct fxregs_state, sw_reserved);
size = sizeof(xstate_fx_sw_bytes);
- ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, count);
+ ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, size_total);
if (ret)
return ret;
@@ -1010,15 +1010,15 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
}
static inline int
-__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, unsigned int count, int end_pos)
+__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int offset, unsigned int size, int size_total)
{
- if (!count)
+ if (!size)
return 0;
- if (end_pos < 0 || pos < end_pos) {
- unsigned int copy = end_pos < 0 ? count : min(count, end_pos - pos);
+ if (size_total < 0 || offset < size_total) {
+ unsigned int copy = size_total < 0 ? size : min(size, size_total - offset);
- if (__copy_to_user(ubuf + pos, data, copy))
+ if (__copy_to_user(ubuf + offset, data, copy))
return -EFAULT;
}
return 0;
@@ -1030,7 +1030,7 @@ __copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, uns
* zero. This is called from xstateregs_get() and there we check the CPU
* has XSAVES.
*/
-int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int pos, unsigned int count)
+int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset_start, unsigned int size_total)
{
unsigned int offset, size;
int ret, i;
@@ -1039,7 +1039,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
/*
* Currently copy_regset_to_user() starts from pos 0:
*/
- if (unlikely(pos != 0))
+ if (unlikely(offset_start != 0))
return -EFAULT;
/*
@@ -1055,7 +1055,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = offsetof(struct xregs_state, header);
size = sizeof(header);
- ret = __copy_xstate_to_user(ubuf, &header, offset, size, count);
+ ret = __copy_xstate_to_user(ubuf, &header, offset, size, size_total);
if (ret)
return ret;
@@ -1069,11 +1069,11 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = xstate_offsets[i];
size = xstate_sizes[i];
- ret = __copy_xstate_to_user(ubuf, src, offset, size, count);
+ ret = __copy_xstate_to_user(ubuf, src, offset, size, size_total);
if (ret)
return ret;
- if (offset + size >= count)
+ if (offset + size >= size_total)
break;
}
@@ -1085,7 +1085,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = offsetof(struct fxregs_state, sw_reserved);
size = sizeof(xstate_fx_sw_bytes);
- ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, count);
+ ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, size_total);
if (ret)
return ret;
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | Thomas Gleixner <tglx@linutronix.de> |
|---|---|
| Date | 2017-09-25 22:00 +0200 |
| Subject | Re: [PATCH 08/33] x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods |
| Message-ID | <utHHQ-2sG-23@gated-at.bofh.it> |
| In reply to | #1738019 |
On Sat, 23 Sep 2017, Ingo Molnar wrote:
> static inline int
> __copy_xstate_to_kernel(void *kbuf,
> const void *data,
> - unsigned int pos, unsigned int count, int end_pos)
> + unsigned int offset, unsigned int size, int size_total)
Why is size_total int?
> {
> - if (!count)
> + if (!size)
> return 0;
>
> - if (end_pos < 0 || pos < end_pos) {
> - unsigned int copy = end_pos < 0 ? count : min(count, end_pos - pos);
> + if (size_total < 0 || offset < size_total) {
And why would it be < 0? The call sites of this inline are all inside of:
int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave,
unsigned int offset_start, int size_total)
and hand in size_total completely unmodified. copy_xstate_to_kernel()
itself has a single callsite:
int xstateregs_get(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
and that hands in count unmodified.
The same issue is with the to_user() variant which is even more
obvious. All callers are inside of copy_xstate_to_user() where size_total
is an unsigned int argument which is handed in unmodified.
This signed/unsigned mismatch is confusing at best.
Thanks,
tglx
[toc] | [prev] | [next] | [standalone]
| From | Thomas Gleixner <tglx@linutronix.de> |
|---|---|
| Date | 2017-09-25 22:10 +0200 |
| Subject | Re: [PATCH 08/33] x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods |
| Message-ID | <utHRx-2MV-19@gated-at.bofh.it> |
| In reply to | #1739252 |
On Mon, 25 Sep 2017, Thomas Gleixner wrote: > > This signed/unsigned mismatch is confusing at best. Bah, should have read the next patch before staring at the code .... Thanks, tglx
[toc] | [prev] | [next] | [standalone]
| From | tip-bot for Ingo Molnar <tipbot@zytor.com> |
|---|---|
| Date | 2017-09-26 10:40 +0200 |
| Subject | [tip:x86/fpu] x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods |
| Message-ID | <utTzn-2jm-81@gated-at.bofh.it> |
| In reply to | #1738019 |
Commit-ID: 56583c9a1400fe1935edd55b24b4fbbc779b59cb
Gitweb: http://git.kernel.org/tip/56583c9a1400fe1935edd55b24b4fbbc779b59cb
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Sat, 23 Sep 2017 14:59:51 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sun, 24 Sep 2017 13:04:32 +0200
x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods
Right now there's a confusing mixture of 'offset' and 'size' parameters:
- __copy_xstate_to_*() input parameter 'end_pos' not not really an offset,
but the full size of the copy to be performed.
- input parameter 'count' to copy_xstate_to_*() shadows that of
__copy_xstate_to_*()'s 'count' parameter name - but the roles
are different: the first one is the total number of bytes to
be copied, while the second one is a partial copy size.
To unconfuse all this, use a consistent set of parameter names:
- 'size' is the partial copy size within a single xstate component
- 'size_total' is the total copy requested
- 'offset_start' is the requested starting offset.
- 'offset' is the offset within an xstate component.
No change in functionality.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-9-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/fpu/xstate.h | 4 ++--
arch/x86/kernel/fpu/xstate.c | 44 +++++++++++++++++++--------------------
2 files changed, 24 insertions(+), 24 deletions(-)
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index e4430b8..fed6617 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -48,8 +48,8 @@ void fpu__xstate_clear_all_cpu_caps(void);
void *get_xsave_addr(struct xregs_state *xsave, int xstate);
const void *get_xsave_field_ptr(int xstate_field);
int using_compacted_format(void);
-int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int pos, unsigned int count);
-int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int pos, unsigned int count);
+int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
+int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
struct xregs_state *xsave);
#endif
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 1f50fda..c130835 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -927,15 +927,15 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
static inline int
__copy_xstate_to_kernel(void *kbuf,
const void *data,
- unsigned int pos, unsigned int count, int end_pos)
+ unsigned int offset, unsigned int size, int size_total)
{
- if (!count)
+ if (!size)
return 0;
- if (end_pos < 0 || pos < end_pos) {
- unsigned int copy = end_pos < 0 ? count : min(count, end_pos - pos);
+ if (size_total < 0 || offset < size_total) {
+ unsigned int copy = size_total < 0 ? size : min(size, size_total - offset);
- memcpy(kbuf + pos, data, copy);
+ memcpy(kbuf + offset, data, copy);
}
return 0;
}
@@ -947,7 +947,7 @@ __copy_xstate_to_kernel(void *kbuf,
* It supports partial copy but pos always starts from zero. This is called
* from xstateregs_get() and there we check the CPU has XSAVES.
*/
-int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int pos, unsigned int count)
+int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset_start, unsigned int size_total)
{
unsigned int offset, size;
int ret, i;
@@ -956,7 +956,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
/*
* Currently copy_regset_to_user() starts from pos 0:
*/
- if (unlikely(pos != 0))
+ if (unlikely(offset_start != 0))
return -EFAULT;
/*
@@ -972,7 +972,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = offsetof(struct xregs_state, header);
size = sizeof(header);
- ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, count);
+ ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, size_total);
if (ret)
return ret;
@@ -986,11 +986,11 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = xstate_offsets[i];
size = xstate_sizes[i];
- ret = __copy_xstate_to_kernel(kbuf, src, offset, size, count);
+ ret = __copy_xstate_to_kernel(kbuf, src, offset, size, size_total);
if (ret)
return ret;
- if (offset + size >= count)
+ if (offset + size >= size_total)
break;
}
@@ -1002,7 +1002,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = offsetof(struct fxregs_state, sw_reserved);
size = sizeof(xstate_fx_sw_bytes);
- ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, count);
+ ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, size_total);
if (ret)
return ret;
@@ -1010,15 +1010,15 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
}
static inline int
-__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, unsigned int count, int end_pos)
+__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int offset, unsigned int size, int size_total)
{
- if (!count)
+ if (!size)
return 0;
- if (end_pos < 0 || pos < end_pos) {
- unsigned int copy = end_pos < 0 ? count : min(count, end_pos - pos);
+ if (size_total < 0 || offset < size_total) {
+ unsigned int copy = size_total < 0 ? size : min(size, size_total - offset);
- if (__copy_to_user(ubuf + pos, data, copy))
+ if (__copy_to_user(ubuf + offset, data, copy))
return -EFAULT;
}
return 0;
@@ -1030,7 +1030,7 @@ __copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, uns
* zero. This is called from xstateregs_get() and there we check the CPU
* has XSAVES.
*/
-int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int pos, unsigned int count)
+int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset_start, unsigned int size_total)
{
unsigned int offset, size;
int ret, i;
@@ -1039,7 +1039,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
/*
* Currently copy_regset_to_user() starts from pos 0:
*/
- if (unlikely(pos != 0))
+ if (unlikely(offset_start != 0))
return -EFAULT;
/*
@@ -1055,7 +1055,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = offsetof(struct xregs_state, header);
size = sizeof(header);
- ret = __copy_xstate_to_user(ubuf, &header, offset, size, count);
+ ret = __copy_xstate_to_user(ubuf, &header, offset, size, size_total);
if (ret)
return ret;
@@ -1069,11 +1069,11 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = xstate_offsets[i];
size = xstate_sizes[i];
- ret = __copy_xstate_to_user(ubuf, src, offset, size, count);
+ ret = __copy_xstate_to_user(ubuf, src, offset, size, size_total);
if (ret)
return ret;
- if (offset + size >= count)
+ if (offset + size >= size_total)
break;
}
@@ -1085,7 +1085,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = offsetof(struct fxregs_state, sw_reserved);
size = sizeof(xstate_fx_sw_bytes);
- ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, count);
+ ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, size_total);
if (ret)
return ret;
[toc] | [prev] | [next] | [standalone]
Page 2 of 4 — ← Prev page 1 [2] 3 4 Next page →
Back to top | Article view | linux.kernel
csiph-web