On Tue, Sep 20, 2022 at 09:36:18PM +0000, Sean Christopherson wrote:
> Yes, but ideally KVM would explicitly tell the guest "you don't have LMSLE".
> Probably a moot point, but at the same time I don't see a reason not to be
> explicit.
Yes but...
On Tue, Sep 20, 2022 at 02:36:34PM -0700, Jim Mattson wrote:
> Reporting that CPUID bit gives us the right to raise #GP. AMD CPUs
> (going way back) that don't report EferLmsleUnsupported do not raise
> #GP.
... what does "gives us the right" mean exactly?
I'm pretty sure I'm missing something about how KVM works but wouldn't
it raise a guest #GP when the guest tries to set an unsupported EFER
bit? I.e., why do you need to explicitly do
kvm_cpu_cap_set(X86_FEATURE_NO_LMSLE);
and not handle this like any other EFER reserved bit?
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
