Re: [PATCH v2 00/11] KVM in-guest performance monitoring

[Avi Kivity <avi@redhat.com>]

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On 06/13/2011 10:55 PM, David Ahern wrote:
> On 06/13/2011 07:34 AM, Avi Kivity wrote:
> >  This patchset exposes an emulated version 1 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.
>
> Any particular magic needed to try this patchset?
>

You'll need the attached patch, '-cpu host' (or '-cpu host,model=0' 
sometimes), and, as patch 2 is a guest bug fix, you'll need to run the 
patched kernel in the guest as well.

-- 
error compiling committee.c: too many arguments to function


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>From 520cf568954500457e1efe37e144c022a767e41f Mon Sep 17 00:00:00 2001
From: Avi Kivity <avi@redhat.com>
Date: Mon, 9 May 2011 09:59:52 +0300
Subject: [PATCH] pmu hack

Signed-off-by: Avi Kivity <avi@redhat.com>
---
 target-i386/cpuid.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/target-i386/cpuid.c b/target-i386/cpuid.c
index 091d812..52ee7a6 100644
--- a/target-i386/cpuid.c
+++ b/target-i386/cpuid.c
@@ -1124,7 +1124,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
         break;
     case 0xA:
         /* Architectural Performance Monitoring Leaf */
-        *eax = 0;
+        *eax = 0x07280201;
         *ebx = 0;
         *ecx = 0;
         *edx = 0;
-- 
1.7.5.3