Re: [PATCH] KVM: x86/mmu: Precisely invalidate MMU root_role during CPUID update

[Sean Christopherson]

On Mon, 08 Apr 2024 16:11:15 -0700, Sean Christopherson wrote:
> Set kvm_mmu_page_role.invalid to mark the various MMU root_roles invalid
> during CPUID update in order to force a refresh, instead of zeroing out
> the entire role.  This fixes a bug where kvm_mmu_free_roots() incorrectly
> thinks a root is indirect, i.e. not a TDP MMU, due to "direct" being
> zeroed, which in turn causes KVM to take mmu_lock for write instead of
> read.
> 
> [...]

Applied super quickly to kvm-x86 fixes, so that it gets time in -next before I
pass it on to Paolo.  This is the last commit in "fixes", so it's easy to drop
and/or modify if there's an issue.

[1/1] KVM: x86/mmu: Precisely invalidate MMU root_role during CPUID update
      https://github.com/kvm-x86/linux/commit/4fa96da3e6fe

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