linux-kernel - Re: [PATCH 0/3] Unify VERW mitigation for guests

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Message-ID: <aQKxVLoS2MzBiSIm@google.com>
Date: Wed, 29 Oct 2025 17:29:08 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>, 
	Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>, 
	Ingo Molnar <mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>, Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org, 
	kvm@...r.kernel.org, Tao Zhang <tao1.zhang@...el.com>, 
	Jim Mattson <jmattson@...gle.com>, Brendan Jackman <jackmanb@...gle.com>
Subject: Re: [PATCH 0/3] Unify VERW mitigation for guests

On Wed, Oct 29, 2025, Pawan Gupta wrote:
> ---
> Pawan Gupta (3):
>       x86/bugs: Use VM_CLEAR_CPU_BUFFERS in VMX as well
>       x86/mmio: Rename cpu_buf_vm_clear to cpu_buf_vm_clear_mmio_only
>       x86/mmio: Unify VERW mitigation for guests
> 
>  arch/x86/include/asm/nospec-branch.h |  2 +-
>  arch/x86/kernel/cpu/bugs.c           | 17 +++++++++++------
>  arch/x86/kvm/mmu/spte.c              |  2 +-
>  arch/x86/kvm/vmx/run_flags.h         | 12 ++++++------
>  arch/x86/kvm/vmx/vmenter.S           |  8 +++++++-
>  arch/x86/kvm/vmx/vmx.c               | 26 ++++++++++----------------
>  6 files changed, 36 insertions(+), 31 deletions(-)
> ---

Any objection to taking these through the KVM tree when they're ready?  There
will be a conflict in vmx.c with an L1TF related cleanup, and that conflict is
actually helpful in that the two series feed off each other a little bit.