On 12/01/21 18:59, Sean Christopherson wrote:
It would be very helpful to list exactly which CPUs are/aren't affected, even if
that just means stating something like "all CPUs before XYZ". Given patch 2/2,
I assume it's all CPUs without the new CPUID flag?
Ah, despite calling this an 'errata', the bad behavior is explicitly documented
in the APM, i.e. it's an architecture bug, not a silicon bug.
I would still call it an errata for the case when virtualized
VMSAVE/VMLOAD is enabled (and therefore VMLOAD intercepts are disabled).
In that case, the problem is that the GPA does not go through NPT
before it is checked against *host* reserved memory regions.
In fact I hope that, on processors that have the fix, VMSAVE/VMLOAD
from guest mode _does_ check the GPA after it's been translated!
Paolo
