From: Alexander Graf <agraf@suse.de> To: kvm-ppc@vger.kernel.org Cc: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, KVM list <kvm@vger.kernel.org> Subject: [PATCH 00/27] KVM PPC PV framework v3 Date: Thu, 29 Jul 2010 14:47:41 +0200 [thread overview] Message-ID: <1280407688-9815-1-git-send-email-agraf@suse.de> (raw) On PPC we run PR=0 (kernel mode) code in PR=1 (user mode) and don't use the hypervisor extensions. While that is all great to show that virtualization is possible, there are quite some cases where the emulation overhead of privileged instructions is killing performance. This patchset tackles exactly that issue. It introduces a paravirtual framework using which KVM and Linux share a page to exchange register state with. That way we don't have to switch to the hypervisor just to change a value of a privileged register. To prove my point, I ran the same test I did for the MMU optimizations against the PV framework. Here are the results: [without] debian-powerpc:~# time for i in {1..1000}; do /bin/echo hello > /dev/null; done real 0m14.659s user 0m8.967s sys 0m5.688s [with] debian-powerpc:~# time for i in {1..1000}; do /bin/echo hello > /dev/null; done real 0m7.557s user 0m4.121s sys 0m3.426s So this is a significant performance improvement! I'm quite happy how fast this whole thing becomes :) I tried to take all comments I've heard from people so far about such a PV framework into account. In case you told me something before that is a no-go and I still did it, please just tell me again. To make use of this whole thing you also need patches to qemu and openbios. I have them in my queue, but want to see this set upstream first before I start sending patches to the other projects. Now go and have fun with fast VMs on PPC! Get yourself a G5 on ebay and start experiencing the power yourself. - heh v1 -> v2: - change hypervisor calls to use r0 and r3 - make crit detection only trigger in supervisor mode - RMO -> PAM - introduce kvm_patch_ins - only flush icache when patching - introduce kvm_patch_ins_b - update documentation v2 -> v3: - use pPAPR conventions for hypercall interface - only use r0 as magic sc number - remove PVR detection - remove BookE shared page mapping support - combine book3s-64 and -32 magic page ra override - add self-test check if the mapping works to guest code - add safety check for relocatable kernels Alexander Graf (27): KVM: PPC: Introduce shared page KVM: PPC: Convert MSR to shared page KVM: PPC: Convert DSISR to shared page KVM: PPC: Convert DAR to shared page. KVM: PPC: Convert SRR0 and SRR1 to shared page KVM: PPC: Convert SPRG[0-4] to shared page KVM: PPC: Implement hypervisor interface KVM: PPC: Add PV guest critical sections KVM: PPC: Add PV guest scratch registers KVM: PPC: Tell guest about pending interrupts KVM: PPC: Make PAM a define KVM: PPC: First magic page steps KVM: PPC: Magic Page Book3s support KVM: PPC: Expose magic page support to guest KVM: Move kvm_guest_init out of generic code KVM: PPC: Generic KVM PV guest support KVM: PPC: KVM PV guest stubs KVM: PPC: PV instructions to loads and stores KVM: PPC: PV tlbsync to nop KVM: PPC: Introduce kvm_tmp framework KVM: PPC: Introduce branch patching helper KVM: PPC: PV assembler helpers KVM: PPC: PV mtmsrd L=1 KVM: PPC: PV mtmsrd L=0 and mtmsr KVM: PPC: PV wrteei KVM: PPC: Add Documentation about PV interface KVM: PPC: Add get_pvinfo interface to query hypercall instructions Documentation/kvm/api.txt | 23 ++ Documentation/kvm/ppc-pv.txt | 180 +++++++++++ arch/powerpc/include/asm/kvm_book3s.h | 2 +- arch/powerpc/include/asm/kvm_host.h | 15 +- arch/powerpc/include/asm/kvm_para.h | 135 ++++++++- arch/powerpc/include/asm/kvm_ppc.h | 1 + arch/powerpc/kernel/Makefile | 2 + arch/powerpc/kernel/asm-offsets.c | 18 +- arch/powerpc/kernel/kvm.c | 485 ++++++++++++++++++++++++++++++ arch/powerpc/kernel/kvm_emul.S | 247 +++++++++++++++ arch/powerpc/kvm/44x.c | 7 + arch/powerpc/kvm/44x_tlb.c | 8 +- arch/powerpc/kvm/book3s.c | 188 ++++++++---- arch/powerpc/kvm/book3s_32_mmu.c | 28 ++- arch/powerpc/kvm/book3s_32_mmu_host.c | 6 +- arch/powerpc/kvm/book3s_64_mmu.c | 42 +++- arch/powerpc/kvm/book3s_64_mmu_host.c | 13 +- arch/powerpc/kvm/book3s_emulate.c | 25 +- arch/powerpc/kvm/book3s_paired_singles.c | 11 +- arch/powerpc/kvm/booke.c | 83 ++++-- arch/powerpc/kvm/booke.h | 6 +- arch/powerpc/kvm/booke_emulate.c | 14 +- arch/powerpc/kvm/booke_interrupts.S | 3 +- arch/powerpc/kvm/e500.c | 7 + arch/powerpc/kvm/e500_tlb.c | 12 +- arch/powerpc/kvm/e500_tlb.h | 2 +- arch/powerpc/kvm/emulate.c | 36 ++- arch/powerpc/kvm/powerpc.c | 84 +++++- arch/powerpc/platforms/Kconfig | 10 + arch/x86/include/asm/kvm_para.h | 6 + include/linux/kvm.h | 11 + include/linux/kvm_para.h | 7 +- 32 files changed, 1538 insertions(+), 179 deletions(-) create mode 100644 Documentation/kvm/ppc-pv.txt create mode 100644 arch/powerpc/kernel/kvm.c create mode 100644 arch/powerpc/kernel/kvm_emul.S
WARNING: multiple messages have this Message-ID (diff)
From: Alexander Graf <agraf@suse.de> To: kvm-ppc@vger.kernel.org Cc: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, KVM list <kvm@vger.kernel.org> Subject: [PATCH 00/27] KVM PPC PV framework v3 Date: Thu, 29 Jul 2010 12:47:41 +0000 [thread overview] Message-ID: <1280407688-9815-1-git-send-email-agraf@suse.de> (raw) On PPC we run PR=0 (kernel mode) code in PR=1 (user mode) and don't use the hypervisor extensions. While that is all great to show that virtualization is possible, there are quite some cases where the emulation overhead of privileged instructions is killing performance. This patchset tackles exactly that issue. It introduces a paravirtual framework using which KVM and Linux share a page to exchange register state with. That way we don't have to switch to the hypervisor just to change a value of a privileged register. To prove my point, I ran the same test I did for the MMU optimizations against the PV framework. Here are the results: [without] debian-powerpc:~# time for i in {1..1000}; do /bin/echo hello > /dev/null; done real 0m14.659s user 0m8.967s sys 0m5.688s [with] debian-powerpc:~# time for i in {1..1000}; do /bin/echo hello > /dev/null; done real 0m7.557s user 0m4.121s sys 0m3.426s So this is a significant performance improvement! I'm quite happy how fast this whole thing becomes :) I tried to take all comments I've heard from people so far about such a PV framework into account. In case you told me something before that is a no-go and I still did it, please just tell me again. To make use of this whole thing you also need patches to qemu and openbios. I have them in my queue, but want to see this set upstream first before I start sending patches to the other projects. Now go and have fun with fast VMs on PPC! Get yourself a G5 on ebay and start experiencing the power yourself. - heh v1 -> v2: - change hypervisor calls to use r0 and r3 - make crit detection only trigger in supervisor mode - RMO -> PAM - introduce kvm_patch_ins - only flush icache when patching - introduce kvm_patch_ins_b - update documentation v2 -> v3: - use pPAPR conventions for hypercall interface - only use r0 as magic sc number - remove PVR detection - remove BookE shared page mapping support - combine book3s-64 and -32 magic page ra override - add self-test check if the mapping works to guest code - add safety check for relocatable kernels Alexander Graf (27): KVM: PPC: Introduce shared page KVM: PPC: Convert MSR to shared page KVM: PPC: Convert DSISR to shared page KVM: PPC: Convert DAR to shared page. KVM: PPC: Convert SRR0 and SRR1 to shared page KVM: PPC: Convert SPRG[0-4] to shared page KVM: PPC: Implement hypervisor interface KVM: PPC: Add PV guest critical sections KVM: PPC: Add PV guest scratch registers KVM: PPC: Tell guest about pending interrupts KVM: PPC: Make PAM a define KVM: PPC: First magic page steps KVM: PPC: Magic Page Book3s support KVM: PPC: Expose magic page support to guest KVM: Move kvm_guest_init out of generic code KVM: PPC: Generic KVM PV guest support KVM: PPC: KVM PV guest stubs KVM: PPC: PV instructions to loads and stores KVM: PPC: PV tlbsync to nop KVM: PPC: Introduce kvm_tmp framework KVM: PPC: Introduce branch patching helper KVM: PPC: PV assembler helpers KVM: PPC: PV mtmsrd L=1 KVM: PPC: PV mtmsrd L=0 and mtmsr KVM: PPC: PV wrteei KVM: PPC: Add Documentation about PV interface KVM: PPC: Add get_pvinfo interface to query hypercall instructions Documentation/kvm/api.txt | 23 ++ Documentation/kvm/ppc-pv.txt | 180 +++++++++++ arch/powerpc/include/asm/kvm_book3s.h | 2 +- arch/powerpc/include/asm/kvm_host.h | 15 +- arch/powerpc/include/asm/kvm_para.h | 135 ++++++++- arch/powerpc/include/asm/kvm_ppc.h | 1 + arch/powerpc/kernel/Makefile | 2 + arch/powerpc/kernel/asm-offsets.c | 18 +- arch/powerpc/kernel/kvm.c | 485 ++++++++++++++++++++++++++++++ arch/powerpc/kernel/kvm_emul.S | 247 +++++++++++++++ arch/powerpc/kvm/44x.c | 7 + arch/powerpc/kvm/44x_tlb.c | 8 +- arch/powerpc/kvm/book3s.c | 188 ++++++++---- arch/powerpc/kvm/book3s_32_mmu.c | 28 ++- arch/powerpc/kvm/book3s_32_mmu_host.c | 6 +- arch/powerpc/kvm/book3s_64_mmu.c | 42 +++- arch/powerpc/kvm/book3s_64_mmu_host.c | 13 +- arch/powerpc/kvm/book3s_emulate.c | 25 +- arch/powerpc/kvm/book3s_paired_singles.c | 11 +- arch/powerpc/kvm/booke.c | 83 ++++-- arch/powerpc/kvm/booke.h | 6 +- arch/powerpc/kvm/booke_emulate.c | 14 +- arch/powerpc/kvm/booke_interrupts.S | 3 +- arch/powerpc/kvm/e500.c | 7 + arch/powerpc/kvm/e500_tlb.c | 12 +- arch/powerpc/kvm/e500_tlb.h | 2 +- arch/powerpc/kvm/emulate.c | 36 ++- arch/powerpc/kvm/powerpc.c | 84 +++++- arch/powerpc/platforms/Kconfig | 10 + arch/x86/include/asm/kvm_para.h | 6 + include/linux/kvm.h | 11 + include/linux/kvm_para.h | 7 +- 32 files changed, 1538 insertions(+), 179 deletions(-) create mode 100644 Documentation/kvm/ppc-pv.txt create mode 100644 arch/powerpc/kernel/kvm.c create mode 100644 arch/powerpc/kernel/kvm_emul.S
next reply other threads:[~2010-07-29 12:47 UTC|newest] Thread overview: 115+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-07-29 12:47 Alexander Graf [this message] 2010-07-29 12:47 ` [PATCH 00/27] KVM PPC PV framework v3 Alexander Graf 2010-07-29 12:47 ` [PATCH 04/27] KVM: PPC: Convert DAR to shared page Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 05/27] KVM: PPC: Convert SRR0 and SRR1 " Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 07/27] KVM: PPC: Implement hypervisor interface Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 09/27] KVM: PPC: Add PV guest scratch registers Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 11/27] KVM: PPC: Make PAM a define Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 12/27] KVM: PPC: First magic page steps Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 13/27] KVM: PPC: Magic Page Book3s support Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 15/27] KVM: Move kvm_guest_init out of generic code Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 16/27] KVM: PPC: Generic KVM PV guest support Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 17/27] KVM: PPC: KVM PV guest stubs Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf [not found] ` <1280407688-9815-18-git-send-email-agraf-l3A5Bk7waGM@public.gmane.org> 2010-08-05 17:16 ` Hollis Blanchard 2010-08-05 17:16 ` Hollis Blanchard 2010-08-05 17:16 ` Hollis Blanchard 2010-07-29 12:47 ` [PATCH 18/27] KVM: PPC: PV instructions to loads and stores Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:48 ` [PATCH 22/27] KVM: PPC: PV assembler helpers Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` [PATCH 24/27] KVM: PPC: PV mtmsrd L=0 and mtmsr Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` [PATCH 27/27] KVM: PPC: Add get_pvinfo interface to query hypercall instructions Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` Alexander Graf [not found] ` <1280407688-9815-1-git-send-email-agraf-l3A5Bk7waGM@public.gmane.org> 2010-07-29 12:47 ` [PATCH 01/27] KVM: PPC: Introduce shared page Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf [not found] ` <1280407688-9815-2-git-send-email-agraf-l3A5Bk7waGM@public.gmane.org> 2010-08-05 17:05 ` Hollis Blanchard 2010-08-05 17:05 ` Hollis Blanchard 2010-08-05 17:05 ` Hollis Blanchard 2010-07-29 12:47 ` [PATCH 02/27] KVM: PPC: Convert MSR to " Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 03/27] KVM: PPC: Convert DSISR " Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 06/27] KVM: PPC: Convert SPRG[0-4] " Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 08/27] KVM: PPC: Add PV guest critical sections Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 10/27] KVM: PPC: Tell guest about pending interrupts Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` [PATCH 14/27] KVM: PPC: Expose magic page support to guest Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:47 ` Alexander Graf 2010-07-29 12:48 ` [PATCH 19/27] KVM: PPC: PV tlbsync to nop Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` [PATCH 20/27] KVM: PPC: Introduce kvm_tmp framework Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` [PATCH 21/27] KVM: PPC: Introduce branch patching helper Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` [PATCH 23/27] KVM: PPC: PV mtmsrd L=1 Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` [PATCH 25/27] KVM: PPC: PV wrteei Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` [PATCH 26/27] KVM: PPC: Add Documentation about PV interface Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-07-29 12:48 ` Alexander Graf 2010-08-01 14:02 ` [PATCH 00/27] KVM PPC PV framework v3 Avi Kivity 2010-08-01 14:02 ` Avi Kivity 2010-08-01 14:02 ` Avi Kivity [not found] ` <4C557E7A.3010606-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 2010-08-01 20:21 ` Alexander Graf 2010-08-01 20:21 ` Alexander Graf 2010-08-01 20:21 ` Alexander Graf 2010-08-03 16:16 ` Scott Wood 2010-08-03 16:16 ` Scott Wood 2010-08-03 16:16 ` Scott Wood [not found] ` <20100803111611.38ca87e6-1MYqz8GpK7RekFaExTCHk1jVikpgYyvb5NbjCUgZEJk@public.gmane.org> 2010-08-05 7:57 ` Avi Kivity 2010-08-05 7:57 ` Avi Kivity 2010-08-05 7:57 ` Avi Kivity 2010-08-05 8:01 ` Alexander Graf 2010-08-05 8:01 ` Alexander Graf 2010-08-05 8:01 ` Alexander Graf 2010-08-05 8:05 ` Avi Kivity 2010-08-05 8:05 ` Avi Kivity 2010-08-05 8:25 ` Avi Kivity 2010-08-05 8:25 ` Avi Kivity 2010-08-05 8:25 ` Avi Kivity 2010-08-06 16:28 ` Kumar Gala 2010-08-06 16:28 ` Kumar Gala 2010-08-06 16:28 ` Kumar Gala [not found] ` <17DF4824-9EC7-44F4-9408-EA6241C33E70-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org> 2010-08-16 13:11 ` Alexander Graf 2010-08-16 13:11 ` Alexander Graf 2010-08-16 13:11 ` Alexander Graf
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