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|---|---|
| From | Josh Poimboeuf <jpoimboe@redhat.com> |
| Newsgroups | linux.kernel |
| Subject | [PATCH v5 05/15] livepatch/powerpc: add TIF_PATCH_PENDING thread flag |
| Date | Tue, 14 Feb 2017 02:50:02 +0100 |
| Message-ID | <taApI-3o3-23@gated-at.bofh.it> (permalink) |
| References | <taApH-3o3-3@gated-at.bofh.it> |
| X-Scanned-By | MIMEDefang 2.74 on 10.5.11.28 |
| X-Greylist | Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Tue, 14 Feb 2017 01:43:04 +0000 (UTC) |
| Sender | robomod@news.nic.it |
| List-ID | <linux-kernel.vger.kernel.org> |
| X-Mailing-List | linux-kernel@vger.kernel.org |
| Approved | robomod@news.nic.it |
| Lines | 71 |
| Organization | linux.* mail to news gateway |
| X-Original-Cc | linux-kernel@vger.kernel.org, live-patching@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>, Heiko Carstens <heiko.carstens@de.ibm.com>, x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Vojtech Pavlik <vojtech@suse.com>, Jiri Slaby <jslaby@suse.cz>, Chris J Arges <chris.j.arges@canonical.com>, Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>, Balbir Singh <bsingharora@gmail.com> |
| X-Original-Date | Mon, 13 Feb 2017 19:42:32 -0600 |
| X-Original-Message-ID | <69e7b24fd0bcf912aa1ea6071d0a345901b3c741.1487036215.git.jpoimboe@redhat.com> |
| X-Original-References | <cover.1487036215.git.jpoimboe@redhat.com> |
| X-Original-Sender | linux-kernel-owner@vger.kernel.org |
| Xref | csiph.com linux.kernel:1580203 |
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Add the TIF_PATCH_PENDING thread flag to enable the new livepatch per-task consistency model for powerpc. The bit getting set indicates the thread has a pending patch which needs to be applied when the thread exits the kernel. The bit is included in the _TIF_USER_WORK_MASK macro so that do_notify_resume() and klp_update_patch_state() get called when the bit is set. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> --- arch/powerpc/include/asm/thread_info.h | 4 +++- arch/powerpc/kernel/signal.c | 4 ++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index 87e4b2d..6fc6464 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -92,6 +92,7 @@ static inline struct thread_info *current_thread_info(void) TIF_NEED_RESCHED */ #define TIF_32BIT 4 /* 32 bit binary */ #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ +#define TIF_PATCH_PENDING 6 /* pending live patching update */ #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ #define TIF_SINGLESTEP 8 /* singlestepping active */ #define TIF_NOHZ 9 /* in adaptive nohz mode */ @@ -115,6 +116,7 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) #define _TIF_32BIT (1<<TIF_32BIT) #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) +#define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING) #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) #define _TIF_SECCOMP (1<<TIF_SECCOMP) @@ -131,7 +133,7 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ - _TIF_RESTORE_TM) + _TIF_RESTORE_TM | _TIF_PATCH_PENDING) #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) /* Bits in local_flags */ diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c index 3a36711..e9436c5 100644 --- a/arch/powerpc/kernel/signal.c +++ b/arch/powerpc/kernel/signal.c @@ -14,6 +14,7 @@ #include <linux/uprobes.h> #include <linux/key.h> #include <linux/context_tracking.h> +#include <linux/livepatch.h> #include <asm/hw_breakpoint.h> #include <linux/uaccess.h> #include <asm/unistd.h> @@ -162,6 +163,9 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) tracehook_notify_resume(regs); } + if (thread_info_flags & _TIF_PATCH_PENDING) + klp_update_patch_state(current); + user_enter(); } -- 2.7.4
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[PATCH v5 05/15] livepatch/powerpc: add TIF_PATCH_PENDING thread flag Josh Poimboeuf <jpoimboe@redhat.com> - 2017-02-14 02:50 +0100
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