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SubjectRe: [RFC PATCH 00/62] Linux as SEV-ES Guest Support
On Tue, Feb 11, 2020 at 03:50:08PM +0100, Peter Zijlstra wrote:

> Oh gawd; so instead of improving the whole NMI situation, AMD went and
> made it worse still ?!?

Well, depends on how you want to see it. Under SEV-ES an IRET will not
re-open the NMI window, but the guest has to tell the hypervisor
explicitly when it is ready to receive new NMIs via the NMI_COMPLETE
message. NMIs stay blocked even when an exception happens in the
handler, so this could also be seen as a (slight) improvement.



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