Re: [PATCH] KVM: x86/mmu: Always guard rmaps with mmu_lock on PREEMPT_RT=y kernels

[Sean Christopherson]

On Wed, 02 Sep 2026 14:17:59 -0700, Sean Christopherson wrote:
> For all intents and purposes, revert KVM's ability to walk rmaps outside of
> mmu_lock when running on a realtime (PREEMPT_RT=y) kernel.  I.e. don't use
> a non-sleepable bit-spinlock to protect rmap entries, as realtime kernels
> are highly unlikely to benefit from increased aging throughput and reduced
> jitter for memory-overcommitted nested VMs, whereas using a non-sleepable
> lock is currently buggy and goes against the spirit of realtime kernels.
> 
> [...]

Applied to kvm-x86 mmu, thanks!

[1/1] KVM: x86/mmu: Always guard rmaps with mmu_lock on PREEMPT_RT=y kernels
      https://github.com/kvm-x86/linux/commit/df269c8e097f

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