Messages in this thread | | | From | Vitaly Kuznetsov <> | Subject | Re: [PATCH v3 0/5] KVM: nVMX: Fix Windows 11 + WSL2 + Enlightened VMCS | Date | Fri, 28 Jan 2022 15:11:22 +0100 |
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Paolo Bonzini <pbonzini@redhat.com> writes:
> On 1/18/22 15:22, Vitaly Kuznetsov wrote: >> 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) > > Yes, it is. I have queued the patch
Thanks!
> and feel free to send a 5.16 backport too.
I see your pull request to Linus, will send the backport when it lands. In fact, all 5 patches apply to 5.16 without issues but I guess stable@ tooling won't pick them up automatically.
-- Vitaly
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