On Tue, Jan 12, 2021, Sean Christopherson wrote:
On Tue, Jan 12, 2021, Wei Huang wrote:
From: Bandan Das <bsd@xxxxxxxxxx>
While running VM related instructions (VMRUN/VMSAVE/VMLOAD), some AMD
CPUs check EAX against reserved memory regions (e.g. SMM memory on host)
before checking VMCB's instruction intercept.
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.
Can you reword the changelog to make it clear that the premature #GP is the
correct architectural behavior for CPUs without the new CPUID flag?