Re: [PATCH v6 24/51] x86/kvm: Get CPU base frequency from CPUID when it's available

David Woodhouse <[email protected]> Sat, 08 Aug 2026 16:06:56 +0100

Newsgroups	org.kernel.vger.linux-hyperv,dev.linux.lists.linux-coco,dev.linux.lists.virtualization,org.kernel.vger.kvm,org.kernel.vger.linux-kernel,org.xenproject.lists.xen-devel
Message-ID	<[email protected]>

On Thu, 2026-08-06 at 16:35 -0700, Sean Christopherson wrote:
> If CPUID.0x16 is present and valid, use the CPU frequency provided by
> CPUID instead of assuming that the virtual CPU runs at the same
> frequency as TSC and/or kvmclock.  Back before constant TSCs were a
> thing, treating the TSC and CPU frequencies as one and the same was
> somewhat reasonable, but now it's nonsensical, especially if the
> hypervisor explicitly enumerates the CPU frequency.
>
> Signed-off-by: Sean Christopherson <[email protected]>

I still don't think I care about Sashiko's complaint.

Reviewed-by: David Woodhouse <[email protected]>

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