Message-ID: <4F4D111A.8020001@redhat.com>
Date: Tue, 28 Feb 2012 19:38:34 +0200
From: Avi Kivity <avi@redhat.com>
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To: David Ahern <dsahern@gmail.com>
CC: Joerg Roedel <joerg.roedel@amd.com>, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, joro@8bytes.org,
        Peter Zijlstra <a.p.zijlstra@chello.nl>, Ingo Molnar <mingo@elte.hu>,
        Stephane Eranian <eranian@google.com>, Gleb Natapov <gleb@redhat.com>,
        Robert Richter <robert.richter@amd.com>
Subject: Re: [PATCH] perf/x86: Fix HO/GO counting with SVM disabled
References: <20120227182325.GA12302@8bytes.org> <1330444544-15665-1-git-send-email-joerg.roedel@amd.com> <4F4D0DD6.9030302@redhat.com> <4F4D10A9.5010707@gmail.com>
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On 02/28/2012 07:36 PM, David Ahern wrote:
> On 2/28/12 10:24 AM, Avi Kivity wrote:
>> On 02/28/2012 05:55 PM, Joerg Roedel wrote:
>>>
>>>   __init int amd_pmu_init(void)
>>> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
>>> index 5fa553b..773fee2 100644
>>> --- a/arch/x86/kvm/svm.c
>>> +++ b/arch/x86/kvm/svm.c
>>> @@ -29,6 +29,7 @@
>>>   #include<linux/ftrace_event.h>
>>>   #include<linux/slab.h>
>>>
>>> +#include<asm/perf_event.h>
>>>   #include<asm/tlbflush.h>
>>>   #include<asm/desc.h>
>>>   #include<asm/kvm_para.h>
>>> @@ -575,6 +576,8 @@ static void svm_hardware_disable(void *garbage)
>>>           wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
>>>
>>>       cpu_svm_disable();
>>> +
>>> +    x86_pmu_disable_virt();
>>>   }
>>>
>>>   static int svm_hardware_enable(void *garbage)
>>> @@ -622,6 +625,8 @@ static int svm_hardware_enable(void *garbage)
>>>
>>>       svm_init_erratum_383();
>>>
>>> +    x86_pmu_enable_virt();
>>> +
>>>       return 0;
>>>   }
>>>
>>
>> These should go into x86.c.  If the functions later gain meaning on
>> Intel, we want them to be called (and nothing in the name suggests
>> they're AMD specific).
>>
>
> I was to suggest the reverse: since this patch addesses an AMD bug,
> why not push those functions into perf_event_amd.c and make them
> dependent on CONFIG_CPU_SUP_AMD as well.

It depends on which direction you expect the code to grow.  These hooks
seem reasonable, so I think they should be generic.

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

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