Re: [PATCH 7/8] kvm-kmod: x86: Add MSR_IA32_TSC compat define

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Jaswinder Singh Rajput wrote:
> Hello Jan,
> 
> On Tue, 2009-05-26 at 13:52 +0200, Jan Kiszka wrote:
>> Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
>> ---
>>
>>  x86/external-module-compat.h |    4 ++++
>>  1 files changed, 4 insertions(+), 0 deletions(-)
>>
>> diff --git a/x86/external-module-compat.h b/x86/external-module-compat.h
>> index 3e6fc11..c33eb2e 100644
>> --- a/x86/external-module-compat.h
>> +++ b/x86/external-module-compat.h
>> @@ -497,6 +497,10 @@ struct kvm_desc_ptr {
>>  #define FEATURE_CONTROL_VMXON_ENABLED	(1<<2)
>>  #endif
>>  
>> +#ifndef MSR_IA32_TSC
>> +#define MSR_IA32_TSC                    0x00000010
>> +#endif
>> +
> 
> AFAIK, MSR_IA32_TSC is defined in include/asm/msr-index.h which is
> available for kernel as well as user space and it is available from long
> time.

msr-index.h is "fairly" new (keep in mind all the x86 unifications and
renaming of msr.h to msr-index.h).

> 
> Can you please point me in which case MSR_IA32_TSC is not visible.

I'm about to loose overview of all those issues I ran into with older
kernels (still more to fix, sigh), but I think to remember this was a
2.6.18 x86_32 problem. Wait... yes, 2.6.18 asm-i386 does not include this.

Jan

-- 
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux
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