Re: [PATCH v3 0/5] KVM: nVMX: Fix Windows 11 + WSL2 + Enlightened VMCS

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On 1/18/22 15:22, Vitaly Kuznetsov wrote:
Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> writes:

Changes since v2 [Sean]:
- Tweak a comment in PATCH5.
- Add Reviewed-by: tags to PATCHes 3 and 5.

Original description:

Windows 11 with enabled Hyper-V role doesn't boot on KVM when Enlightened
VMCS interface is provided to it. The observed behavior doesn't conform to
Hyper-V TLFS. In particular, I'm observing 'VMREAD' instructions trying to
access field 0x4404 ("VM-exit interruption information"). TLFS, however, is
very clear this should not be happening:

"Any VMREAD or VMWRITE instructions while an enlightened VMCS is active is
unsupported and can result in unexpected behavior."

Microsoft confirms this is a bug in Hyper-V which is supposed to get fixed
eventually. For the time being, implement a workaround in KVM allowing
VMREAD instructions to read from the currently loaded Enlightened VMCS.

Patches 1-2 are unrelated fixes to VMX feature MSR filtering when eVMCS is
enabled. Patches 3 and 4 are preparatory changes, patch 5 implements the
workaround.


Paolo,

would it be possible to pick this up for 5.17? Technically, this is a
"fix", even if the bug itself is not in KVM)

Yes, it is. I have queued the patch, and feel free to send a 5.16 backport too.

Paolo




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