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[PATCH 00/10] paravirt: make amount of paravirtualization configurable

Started byJuergen Gross <jgross@suse.com>
First post2017-05-19 18:00 +0200
Last post2017-05-23 08:30 +0200
Articles 5 — 2 participants

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  [PATCH 00/10] paravirt: make amount of paravirtualization configurable Juergen Gross <jgross@suse.com> - 2017-05-19 18:00 +0200
    [PATCH 03/10] xen: move interrupt handling for pv guests under CONFIG_XEN_PV umbrella Juergen Gross <jgross@suse.com> - 2017-05-19 18:00 +0200
    [PATCH 04/10] xen: remove non-pv test from arch/x86/xen/irq.c Juergen Gross <jgross@suse.com> - 2017-05-19 18:00 +0200
    Re: [PATCH 00/10] paravirt: make amount of paravirtualization  configurable Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2017-05-22 21:50 +0200
      Re: [PATCH 00/10] paravirt: make amount of paravirtualization  configurable Juergen Gross <jgross@suse.com> - 2017-05-23 08:30 +0200

#1645702 — [PATCH 00/10] paravirt: make amount of paravirtualization configurable

FromJuergen Gross <jgross@suse.com>
Date2017-05-19 18:00 +0200
Subject[PATCH 00/10] paravirt: make amount of paravirtualization configurable
Message-ID<tISk9-4bg-3@gated-at.bofh.it>
Today paravirtualization is a all-or-nothing game: either a kernel is
compiled with no paravirtualization support at all, or it is supporting
paravirtualized environments like Xen pv-guests or lguest additionally
to some paravirtualized tuning for KVM, Hyperv, VMWare or Xen
HVM-guests.

As support of pv-guests requires quite intrusive pv-hooks (e.g. all
access functions to page table entries, privileged instructions) it is
desirable to enable those hooks only in cases where support of
pv-guests is really desired.

With splitting up of Xen guest support into pv-guest support and
support for HVM-guests it is now possible to do the same for support
of paravirtualization: only if XEN_PV or LGUEST_GUEST are configured
full paravirtualization is required.

This patch series carves out pv-guest support form PARAVIRT by
introducing PARAVIRT_FULL config option selected by XEN_PV and
LGUEST_GUEST config options.

The series has been tested for 32 and 64 bit kernels without
PARAVIRT, with PARAVIRT, and with PARAVIRT + PARAVIRT_FULL configured.


Juergen Gross (10):
  x86: remove stale prototype from arch/x86/include/asm/pgalloc.h
  paravirt: remove unused function paravirt_disable_iospace()
  xen: move interrupt handling for pv guests under CONFIG_XEN_PV
    umbrella
  xen: remove non-pv test from arch/x86/xen/irq.c
  paravirt: add new PARAVIRT_FULL config item
  paravirt: split pv_cpu_ops for support of PARAVIRT_FULL
  paravirt: split pv_irq_ops for support of PARAVIRT_FULL
  paravirt: split pv_mmu_ops for support of PARAVIRT_FULL
  paravirt: split pv_info for support of PARAVIRT_FULL
  paravirt: merge pv_ops_* structures into one

 MAINTAINERS                                 |   2 +-
 arch/x86/Kconfig                            |   4 +
 arch/x86/boot/compressed/misc.h             |   1 +
 arch/x86/entry/entry_32.S                   |   4 +-
 arch/x86/entry/entry_64.S                   |  10 +-
 arch/x86/include/asm/debugreg.h             |   2 +-
 arch/x86/include/asm/desc.h                 |   4 +-
 arch/x86/include/asm/fixmap.h               |   2 +-
 arch/x86/include/asm/irqflags.h             |  40 +-
 arch/x86/include/asm/mmu_context.h          |   4 +-
 arch/x86/include/asm/msr.h                  |   4 +-
 arch/x86/include/asm/paravirt.h             | 738 ++--------------------------
 arch/x86/include/asm/paravirt_full.h        | 714 +++++++++++++++++++++++++++
 arch/x86/include/asm/paravirt_types.h       | 243 +--------
 arch/x86/include/asm/paravirt_types_full.h  | 218 ++++++++
 arch/x86/include/asm/pgalloc.h              |   4 +-
 arch/x86/include/asm/pgtable-3level_types.h |   4 +-
 arch/x86/include/asm/pgtable.h              |   8 +-
 arch/x86/include/asm/processor.h            |   4 +-
 arch/x86/include/asm/ptrace.h               |   5 +-
 arch/x86/include/asm/segment.h              |   2 +-
 arch/x86/include/asm/special_insns.h        |  25 +-
 arch/x86/include/asm/tlbflush.h             |   2 +-
 arch/x86/kernel/Makefile                    |   1 +
 arch/x86/kernel/alternative.c               |   4 +-
 arch/x86/kernel/asm-offsets.c               |  21 +-
 arch/x86/kernel/asm-offsets_64.c            |   9 +-
 arch/x86/kernel/cpu/common.c                |   4 +-
 arch/x86/kernel/cpu/vmware.c                |   6 +-
 arch/x86/kernel/head_64.S                   |   2 +-
 arch/x86/kernel/kvm.c                       |   6 +-
 arch/x86/kernel/kvmclock.c                  |   6 +-
 arch/x86/kernel/paravirt.c                  | 303 +-----------
 arch/x86/kernel/paravirt_full.c             | 277 +++++++++++
 arch/x86/kernel/paravirt_patch_32.c         |  36 +-
 arch/x86/kernel/paravirt_patch_64.c         |  50 +-
 arch/x86/kernel/tsc.c                       |   2 +-
 arch/x86/kernel/vsmp_64.c                   |  18 +-
 arch/x86/lguest/Kconfig                     |   1 +
 arch/x86/lguest/boot.c                      | 100 ++--
 arch/x86/xen/Kconfig                        |   1 +
 arch/x86/xen/Makefile                       |   8 +-
 arch/x86/xen/enlighten_hvm.c                |   4 +-
 arch/x86/xen/enlighten_pv.c                 |  58 ++-
 arch/x86/xen/irq.c                          |  15 +-
 arch/x86/xen/mmu_hvm.c                      |   2 +-
 arch/x86/xen/mmu_pv.c                       |  34 +-
 arch/x86/xen/time.c                         |  11 +-
 drivers/xen/time.c                          |   2 +-
 49 files changed, 1548 insertions(+), 1477 deletions(-)
 create mode 100644 arch/x86/include/asm/paravirt_full.h
 create mode 100644 arch/x86/include/asm/paravirt_types_full.h
 create mode 100644 arch/x86/kernel/paravirt_full.c

-- 
2.12.0

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#1645706 — [PATCH 03/10] xen: move interrupt handling for pv guests under CONFIG_XEN_PV umbrella

FromJuergen Gross <jgross@suse.com>
Date2017-05-19 18:00 +0200
Subject[PATCH 03/10] xen: move interrupt handling for pv guests under CONFIG_XEN_PV umbrella
Message-ID<tIStQ-4fG-37@gated-at.bofh.it>
In reply to#1645702
There is no need to include pv-guest only object files in a kernel not
configured to support those. Move Xen's irq.o, xen-asm*.o and pv parts
of entry_*.o into CONFIG_XEN_PV sections.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 arch/x86/entry/entry_32.S | 4 +++-
 arch/x86/entry/entry_64.S | 6 ++++--
 arch/x86/xen/Makefile     | 8 ++++----
 3 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 50bc26949e9e..37ae4a7809d9 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -789,7 +789,7 @@ ENTRY(spurious_interrupt_bug)
 	jmp	common_exception
 END(spurious_interrupt_bug)
 
-#ifdef CONFIG_XEN
+#ifdef CONFIG_XEN_PV
 ENTRY(xen_hypervisor_callback)
 	pushl	$-1				/* orig_ax = -1 => not a system call */
 	SAVE_ALL
@@ -870,7 +870,9 @@ ENTRY(xen_failsafe_callback)
 	_ASM_EXTABLE(3b, 8b)
 	_ASM_EXTABLE(4b, 9b)
 ENDPROC(xen_failsafe_callback)
+#endif /* CONFIG_XEN_PV */
 
+#ifdef CONFIG_XEN
 BUILD_INTERRUPT3(xen_hvm_callback_vector, HYPERVISOR_CALLBACK_VECTOR,
 		xen_evtchn_do_upcall)
 
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 607d72c4a485..cd47214ff402 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -902,7 +902,7 @@ ENTRY(do_softirq_own_stack)
 	ret
 END(do_softirq_own_stack)
 
-#ifdef CONFIG_XEN
+#ifdef CONFIG_XEN_PV
 idtentry xen_hypervisor_callback xen_do_hypervisor_callback has_error_code=0
 
 /*
@@ -983,7 +983,9 @@ ENTRY(xen_failsafe_callback)
 	ENCODE_FRAME_POINTER
 	jmp	error_exit
 END(xen_failsafe_callback)
+#endif /* CONFIG_XEN_PV */
 
+#ifdef CONFIG_XEN
 apicinterrupt3 HYPERVISOR_CALLBACK_VECTOR \
 	xen_hvm_callback_vector xen_evtchn_do_upcall
 
@@ -998,7 +1000,7 @@ idtentry debug			do_debug		has_error_code=0	paranoid=1 shift_ist=DEBUG_STACK
 idtentry int3			do_int3			has_error_code=0	paranoid=1 shift_ist=DEBUG_STACK
 idtentry stack_segment		do_stack_segment	has_error_code=1
 
-#ifdef CONFIG_XEN
+#ifdef CONFIG_XEN_PV
 idtentry xen_debug		do_debug		has_error_code=0
 idtentry xen_int3		do_int3			has_error_code=0
 idtentry xen_stack_segment	do_stack_segment	has_error_code=1
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index fffb0a16f9e3..5fc463eaafff 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -10,13 +10,13 @@ nostackp := $(call cc-option, -fno-stack-protector)
 CFLAGS_enlighten_pv.o		:= $(nostackp)
 CFLAGS_mmu_pv.o		:= $(nostackp)
 
-obj-y		:= enlighten.o multicalls.o mmu.o irq.o \
-			time.o xen-asm.o xen-asm_$(BITS).o \
+obj-y		:= enlighten.o multicalls.o mmu.o time.o \
 			grant-table.o suspend.o platform-pci-unplug.o
 
 obj-$(CONFIG_XEN_PVHVM)		+= enlighten_hvm.o mmu_hvm.o suspend_hvm.o
-obj-$(CONFIG_XEN_PV)			+= setup.o apic.o pmu.o suspend_pv.o \
-						p2m.o enlighten_pv.o mmu_pv.o
+obj-$(CONFIG_XEN_PV)		+= setup.o apic.o pmu.o suspend_pv.o irq.o \
+					p2m.o enlighten_pv.o mmu_pv.o \
+					xen-asm.o xen-asm_$(BITS).o
 obj-$(CONFIG_XEN_PVH)			+= enlighten_pvh.o
 
 obj-$(CONFIG_EVENT_TRACING) += trace.o
-- 
2.12.0

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#1645710 — [PATCH 04/10] xen: remove non-pv test from arch/x86/xen/irq.c

FromJuergen Gross <jgross@suse.com>
Date2017-05-19 18:00 +0200
Subject[PATCH 04/10] xen: remove non-pv test from arch/x86/xen/irq.c
Message-ID<tIStR-4fG-47@gated-at.bofh.it>
In reply to#1645702
As arch/x86/xen/irq.c is used for pv-guests only, there is no need to
have a test targeting a HVM guest in it. Remove it.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 arch/x86/xen/irq.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c
index 33e92955e09d..3b55ae664521 100644
--- a/arch/x86/xen/irq.c
+++ b/arch/x86/xen/irq.c
@@ -130,8 +130,6 @@ static const struct pv_irq_ops xen_irq_ops __initconst = {
 
 void __init xen_init_irq_ops(void)
 {
-	/* For PVH we use default pv_irq_ops settings. */
-	if (!xen_feature(XENFEAT_hvm_callback_vector))
-		pv_irq_ops = xen_irq_ops;
+	pv_irq_ops = xen_irq_ops;
 	x86_init.irqs.intr_init = xen_init_IRQ;
 }
-- 
2.12.0

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#1647314 — Re: [PATCH 00/10] paravirt: make amount of paravirtualization configurable

FromBoris Ostrovsky <boris.ostrovsky@oracle.com>
Date2017-05-22 21:50 +0200
SubjectRe: [PATCH 00/10] paravirt: make amount of paravirtualization configurable
Message-ID<tK1v4-1nY-37@gated-at.bofh.it>
In reply to#1645702
>  49 files changed, 1548 insertions(+), 1477 deletions(-)
>  create mode 100644 arch/x86/include/asm/paravirt_full.h
>  create mode 100644 arch/x86/include/asm/paravirt_types_full.h
>  create mode 100644 arch/x86/kernel/paravirt_full.c


Do you have this in a tree that can be pulled?

-boris

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#1647670 — Re: [PATCH 00/10] paravirt: make amount of paravirtualization configurable

FromJuergen Gross <jgross@suse.com>
Date2017-05-23 08:30 +0200
SubjectRe: [PATCH 00/10] paravirt: make amount of paravirtualization configurable
Message-ID<tKbuq-7MU-7@gated-at.bofh.it>
In reply to#1647314
On 22/05/17 21:42, Boris Ostrovsky wrote:
> 
>>  49 files changed, 1548 insertions(+), 1477 deletions(-)
>>  create mode 100644 arch/x86/include/asm/paravirt_full.h
>>  create mode 100644 arch/x86/include/asm/paravirt_types_full.h
>>  create mode 100644 arch/x86/kernel/paravirt_full.c
> 
> 
> Do you have this in a tree that can be pulled?

https://github.com/jgross1/linux pvops


Juergen

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