Re: [PATCH 3/5] KVM: x86: Apply TSX_CTRL_CPUID_CLEAR if and only if the vCPU has RTM or HLE

[Jim Mattson]

On Tue, Dec 10, 2024 at 5:33 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote:
>
> When emulating CPUID, retrieve MSR_IA32_TSX_CTRL.TSX_CTRL_CPUID_CLEAR if
> and only if RTM and/or HLE feature bits need to be cleared.  Getting the
> MSR value is unnecessary if neither bit is set, and avoiding the lookup
> saves ~80 cycles for vCPUs without RTM or HLE.
>
> Cc: Jim Mattson <jmattson@xxxxxxxxxx>
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>

I'm not sure why you cc'd me :), but...

Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>