Re: [PATCH v3 1/2][XTF] xtf/vpmu: Add Intel PMU MSR addresses

[Mohit Gambhir <mohit.gambhir@oracle.com>]

On 04/25/2017 11:24 AM, Andrew Cooper wrote:
> On 24/04/17 18:54, Mohit Gambhir wrote:
>> This patch adds Intel PMU MSR addresses as macros for VPMU testing
>>
>> Signed-off-by: Mohit Gambhir <mohit.gambhir@oracle.com>
>> ---
>>   arch/x86/include/arch/msr-index.h | 11 +++++++++++
>>   1 file changed, 11 insertions(+)
>>
>> diff --git a/arch/x86/include/arch/msr-index.h b/arch/x86/include/arch/msr-index.h
>> index 2e90079..3a79025 100644
>> --- a/arch/x86/include/arch/msr-index.h
>> +++ b/arch/x86/include/arch/msr-index.h
>> @@ -38,6 +38,17 @@
>>   #define MSR_GS_BASE                     0xc0000101
>>   #define MSR_SHADOW_GS_BASE              0xc0000102
>>   
>> +#define MSR_IA32_PMC(n)                 (0x000000c1 + (n))
>> +#define MSR_IA32_PERFEVTSEL(n)          (0x00000186 + (n))
>> +#define MSR_IA32_DEBUGCTL                0x000001d9
> I have just recently pushed the LBR/TSX test case, which adds DEBUGCTL.
OK
>> +#define MSR_IA32_FIXED_CTR(n)           (0x00000309 + (n))
>> +#define MSR_IA32_PERF_CAPABILITIES       0x00000345
>> +#define MSR_IA32_FIXED_CTR_CTRL          0x0000038d
>> +#define MSR_IA32_PERF_GLOBAL_CTRL        0x0000038f
>> +#define MSR_IA32_PERF_GLOBAL_STATUS      0x0000038e
>> +#define MSR_IA32_PERF_GLOBAL_OVF_CTRL    0x00000390
>> +#define MSR_IA32_A_PMC(n)               (0x000004c1 + (n))
> Please drop the IA32 infixes.  They only add extra clutter.  Please also
> keep the entire file sorted by MSR index, which will require splitting
> this block into two.
OK
> What is the difference between (what will be) MSR_PMC() and MSR_A_PMC() ?
MSR_A_PMCx are alias addresses to MSR_PMCx that are used for full-width 
read/write access while
MSR_PMCx can only be used for 32 bit read/writes. You can take a look at 
Intel SDM Vol 3B section 18.2.5
"Full-Width Write to Performance Counter Registers" for details.
>
> ~Andrew
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> https://lists.xen.org/xen-devel


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel