linux-kernel - Re: [PATCH v6 8/8] KVM: VMX: Preserve host's DEBUGCTLMSR_FREEZE_IN

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <aHBIqCNLrRZjBt0N@google.com>
Date: Thu, 10 Jul 2025 16:11:36 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: mlevitsk@...hat.com
Cc: Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH v6 8/8] KVM: VMX: Preserve host's DEBUGCTLMSR_FREEZE_IN_SMM
 while running the guest

On Thu, Jun 26, 2025, mlevitsk@...hat.com wrote:
> On Thu, 2025-06-26 at 09:17 -0700, Sean Christopherson wrote:
> > --
> > From: Sean Christopherson <seanjc@...gle.com>
> > Date: Thu, 26 Jun 2025 09:14:20 -0700
> > Subject: [PATCH] KVM: VMX: Add a macro to track which DEBUGCTL bits are
> >  host-owned
> > 
> > Add VMX_HOST_OWNED_DEBUGCTL_BITS to track which bits are host-owned, i.e.
> > need to be preserved when running the guest, to dedup the logic without
> > having to incur a memory load to get at kvm_x86_ops.HOST_OWNED_DEBUGCTL.
> > 
> > No functional change intended.
> > 
> > Suggested-by: Maxim Levitsky <mlevitsk@...hat.com>
> > Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> > ---

...

> Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Applied to kvm-x86 misc, thanks!

[1/1] KVM: VMX: Add a macro to track which DEBUGCTL bits are host-owned
      https://github.com/kvm-x86/linux/commit/e1ef1c57ff70