Messages in this thread | | | From | Vitaly Kuznetsov <> | Subject | Re: [PATCH v3 0/5] KVM: nVMX: Fix Windows 11 + WSL2 + Enlightened VMCS | Date | Tue, 18 Jan 2022 15:22:22 +0100 |
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Vitaly Kuznetsov <vkuznets@redhat.com> 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)
-- Vitaly
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