[Bug 217304] KVM does not handle NMI blocking correctly in nested virtualization

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217304

--- Comment #2 from Eric Li (lixiaoyi13691419520@gmail.com) ---
<bugzilla-daemon@kernel.org> 于2023年4月6日周四 15:14写道：
>
> https://bugzilla.kernel.org/show_bug.cgi?id=217304
>
> --- Comment #1 from Sean Christopherson (seanjc@google.com) ---
> On Thu, Apr 06, 2023, bugzilla-daemon@kernel.org wrote:
> Ya, KVM blocks NMIs on nested NMI VM-Exits, but doesn't unblock NMIs for all
> other
> exit types.  I believe this is the fix (untested):
>
Thanks for the fix. I tested it on Linux 5.19.14, and it passes my experiments.

Detail: I wrote 30 experiments (i.e., tests), numbered from 1 to 30.
Before this bug fix, KVM passes 21 experiments. After this bug fix,
KVM passes 3 more experiments (3, 13, and 14) without introducing any
regression in my experiments. There are 6 more experiments that KVM
still fails (2, 4, 6, 18, 19, and 24). I think we can address them in
another bug on Bugzilla.

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