Re: [PATCH 5/5] KVM: x86/pmu: Hide guest counter updates from the VMRUN instruction

From: Like Xu
Date: Mon May 29 2023 - 10:37:15 EST

On 25/5/2023 5:30 am, Jim Mattson wrote:
Note that there's a bug in the original code for this that has
probably never been fixed: it ignores CMASK and INV in the PerfEvtSel.

Regarding the emulation of CMASK, INV and PIN_CONTROL bits on vPMU,
please forgive me for never having the right expectations (so there will be no
correct emulation), an share more *architecture* descriptions of those hw
behavior, and it would be great to have corresponding selftests as a bug report.