linux-kernel - Re: [PATCH 0/9] KVM in-guest performance monitoring

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Date:	Thu, 3 Nov 2011 14:40:17 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	kvm@...r.kernel.org
Cc:	avi@...hat.com, mtosatti@...hat.com, linux-kernel@...r.kernel.org,
	mingo@...e.hu, a.p.zijlstra@...llo.nl, acme@...stprotocols.net
Subject: Re: [PATCH 0/9] KVM in-guest performance monitoring

Disregard this one please. I've sent old version of the patch series
along with new one by mistake. Please look at PATCHv2 version of the
patch series. Sorry about that :(

On Thu, Nov 03, 2011 at 02:31:29PM +0200, Gleb Natapov wrote:
> This patchset exposes an emulated version 2 architectural performance
> monitoring unit to KVM guests.  The PMU is emulated using perf_events,
> so the host kernel can multiplex host-wide, host-user, and the
> guest on available resources.
> 
> The patches should be applied on top of KVM patches from the patch series
> "[PATCH v2 0/9] perf support for x86 guest/host-only bits" [1]
> 
> If you want to try running perf in a guest you need to apply the patch
> below to qemu-kvm and use -cpu host on qemu command line. But DO NOT
> TRY those patches without applying [2][3] to the host kernel first.
> Don't tell me I didn't warn you!
> 
> [1] https://lkml.org/lkml/2011/10/5/153
> [2] https://lkml.org/lkml/2011/10/18/390
> [3] https://lkml.org/lkml/2011/10/23/163
> 
> Avi Kivity (8):
>   KVM: Expose kvm_lapic_local_deliver()
>   KVM: Expose a version 2 architectural PMU to a guests
>   KVM: Add generic RDPMC support
>   KVM: SVM: Intercept RDPMC
>   KVM: VMX: Intercept RDPMC
>   KVM: Expose the architectural performance monitoring CPUID leaf
>   KVM: x86 emulator: fix RDPMC privilege check
>   KVM: x86 emulator: implement RDPMC (0F 33)
> 
> Gleb Natapov (1):
>   perf: expose perf capability to other modules.
> 
>  arch/x86/include/asm/kvm_emulate.h     |    1 +
>  arch/x86/include/asm/kvm_host.h        |   44 +++
>  arch/x86/include/asm/perf_event.h      |   11 +
>  arch/x86/kernel/cpu/perf_event.c       |   11 +
>  arch/x86/kernel/cpu/perf_event.h       |    2 +
>  arch/x86/kernel/cpu/perf_event_intel.c |    3 +
>  arch/x86/kvm/Makefile                  |    2 +-
>  arch/x86/kvm/emulate.c                 |   13 +-
>  arch/x86/kvm/lapic.c                   |    2 +-
>  arch/x86/kvm/lapic.h                   |    1 +
>  arch/x86/kvm/pmu.c                     |  513 ++++++++++++++++++++++++++++++++
>  arch/x86/kvm/svm.c                     |   15 +
>  arch/x86/kvm/vmx.c                     |   15 +-
>  arch/x86/kvm/x86.c                     |   65 ++++-
>  include/linux/kvm_host.h               |    1 +
>  15 files changed, 686 insertions(+), 13 deletions(-)
>  create mode 100644 arch/x86/kvm/pmu.c
> 
> diff --git a/target-i386/cpuid.c b/target-i386/cpuid.c
> index f179999..ff2a0ca 100644
> --- a/target-i386/cpuid.c
> +++ b/target-i386/cpuid.c
> @@ -1178,11 +1178,20 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
>          *edx = 0;
>          break;
>      case 0xA:
> -        /* Architectural Performance Monitoring Leaf */
> -        *eax = 0;
> -        *ebx = 0;
> -        *ecx = 0;
> -        *edx = 0;
> +	if (kvm_enabled()) {
> +            KVMState *s = env->kvm_state;
> +
> +            *eax = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EAX);
> +            *ebx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EBX);
> +            *ecx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_ECX);
> +            *edx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EDX);
> +	} else {
> +		/* Architectural Performance Monitoring Leaf */
> +		*eax = 0; //0x07280402;
> +		*ebx = 0;
> +		*ecx = 0;
> +		*edx = 0; //0x00000503;
> +	}
>          break;
>      case 0xD:
>          /* Processor Extended State */
> -- 
> 1.7.5.3
> 
> --
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--
			Gleb.
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