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SubjectRe: [PATCH] KVM: VMX: Flush shadow VMCS on emergency reboot
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On 4/12/2025 12:57 AM, Sean Christopherson wrote:
>> If a VMM wants to leverage the VMXOFF behavior, software enumeration
>> might be needed for nested virtualization. Using CPU F/M/S (SPR+) to
>> enumerate a behavior could be problematic for virtualization. Right?
> Yeah, F/M/S is a bad idea. Architecturally, I think the behavior needs to be
> tied to support for SEAM. Is there a safe-ish way to probe for SEAM support,
> without having to glean it from MSR_IA32_MKTME_KEYID_PARTITIONING?

yes, the bit 15 of MSR_IA32_MTRRCAP.

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