Re: [PATCH 0/2] KVM: x86: Fastpath userspace exit fix and hardening

[Sean Christopherson]

On Thu, 23 Apr 2026 09:26:26 -0700, Sean Christopherson wrote:
> Fix a found-by-inspection bug where KVM could fail to flush the PML buffer
> (VMX) or fail to grab the most recet CR0/CR3 (SVM) prior to exiting to
> userspace, which could prove to be fatal if that exit is that last exit prior
> to save/restore, e.g. the last exit before userspace commits to migrating the
> VM.
> 
> Patch 2 is related hardening, i.e. isn't fixing any existing bugs (AFAIK).
> 
> [...]

Applied to kvm-x86 misc, thanks!

[1/2] KVM: x86: Ensure vendor's exit handler runs before fastpath userspace exits
      https://github.com/kvm-x86/linux/commit/0ffedf43910e
[2/2] KVM: SVM: Refresh vcpu->arch.cr{0,3} prior to invoking fastpath handler
      https://github.com/kvm-x86/linux/commit/b21525756e82

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https://github.com/kvm-x86/linux/tree/next