Re: VMX Preemption Timer appears to be buggy on SKX, CLX, and ICX

[Jim Mattson]

On Thu, Jun 4, 2026 at 10:56 PM Chao Gao <chao.gao@xxxxxxxxx> wrote:
>
> On Thu, Jun 04, 2026 at 10:34:40PM -0700, Jim Mattson wrote:
...
> >With respect to EMR, you wrote previously, "A mitigation for this
> >erratum is for software to program the VMX preemption timer for values
> >below 2^25 * CPUID.15H:EBX[31:0] / CPUID.15H:EAX[31:0]."
> >
> >My question is whether the exponent, 25, is a fixed value for all
> >CPUs, regardless of their IA32_VMX_MISC[4:0]. It sounds like you are
> >saying that the exponent may depend on IA32_VMX_MISC[4:0].
>
> Let me double-check this with the internal team and get back to you.

Have you discovered anything?