Re: [Xen-devel] vmx_disable_intercept_for_msr(v, MSR_SHADOW_GS_BASE)

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 01/07/13 10:38, Jan Beulich wrote:
>>>> On 28.06.13 at 23:02, Cyclonus J <cyclonusj@xxxxxxxxx> wrote:
>> I am wondering if we can disable the VMX interception for
>> MSR_SHADOW_GS_BASE as AMD is already doing that.
> I can't immediately see any reason why we shouldn't be permitted
> to do this, but I also don't think this should be performance critical.
>
> If you feel this is important, why don't you contribute a patch,
> with its description saying under what conditions this can yield
> measurable benefit?
>
> Jan

Will this not cause a VMexit on each swapgs instruction, as the
instruction itself does write to MSR 0xC0000102?

I have looked quite closely through the Intel manuals and cant find
confirmation one way or another.

~Andrew

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