Re: [PATCH 2/9] KVM: x86: Emulate triple fault shutdown if RSM emulation fails

[Paolo Bonzini]

On 09/06/21 20:56, Sean Christopherson wrote:
> For recent Intel CPUs, restoring NMI blocking is technically wrong, but
> so is restoring NMI blocking in the first place, and Intel's RSM
> "architecture" is such a mess that just about anything is allowed and can
> be justified as micro-architectural behavior.

The Intel manual is an absolute mess with respect to NMI blocking, and 
for once AMD followed suit.

Some versions of the AMD BIOS and Kernel Developer Manual provide the 
offset of the "NMI masked" flag in the SMM state save area, but 
unfortunately that was discovered too late.

Paolo