Re: [PATCH v2] KVM: x86: Ignore MSR_AMD64_TW_CFG access

[Sean Christopherson]

On Thu, 19 Oct 2023 18:06:57 +0200, Maciej S. Szmigiero wrote:
> Hyper-V enabled Windows Server 2022 KVM VM cannot be started on Zen1 Ryzen
> since it crashes at boot with SYSTEM_THREAD_EXCEPTION_NOT_HANDLED +
> STATUS_PRIVILEGED_INSTRUCTION (in other words, because of an unexpected #GP
> in the guest kernel).
> 
> This is because Windows tries to set bit 8 in MSR_AMD64_TW_CFG and can't
> handle receiving a #GP when doing so.
> 
> [...]

Applied to kvm-x86 misc, thanks!  I added a paragraph at the end of the
changelog to capture the gist of the discussion on why we agreed that having
KVM eat MSR accesses is the least awful option.  I also tagged this for stable.

Paolo, holler if you want to grab this for v6.6 and I'll drop my copy.

[1/1] KVM: x86: Ignore MSR_AMD64_TW_CFG access
      https://github.com/kvm-x86/linux/commit/2770d4722036

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