From: Sean Christopherson <seanjc@google.com>
To: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Xuanqing Shi <1356292400@qq.com>
Subject: Re: [PATCH v2] KVM: VMX: Handle bad values on proxied writes to LBR MSRs
Date: Fri, 29 May 2026 15:47:54 -0700 [thread overview]
Message-ID: <178009472610.881059.2932861959029055304.b4-ty@google.com> (raw)
In-Reply-To: <20260527022617.3973884-1-seanjc@google.com>
On Tue, 26 May 2026 19:26:17 -0700, Sean Christopherson wrote:
> Use the "safe" WRMSR API when writing LBRs on behalf of the guest (or host
> userspace), and propagate any errors back to the instigator, as the value
> being written is untrusted. E.g. if the guest (or host userspace) attempts
> to set reserved bits in LBR_SELECT, then KVM needs to return an error, and
> not WARN on the bad value.
>
> Continue using the "unsafe" version of RDMSR, as it should be impossible to
> reach the helper with a completely bogus MSR, i.e. WARNing on RDMSR failure
> is very desirable, e.g. to make KVM bugs more visible.
>
> [...]
Applied to kvm-x86 vmx, thanks!
[1/1] KVM: VMX: Handle bad values on proxied writes to LBR MSRs
https://github.com/kvm-x86/linux/commit/ca674df13b19
--
https://github.com/kvm-x86/linux/tree/next
prev parent reply other threads:[~2026-05-29 22:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-27 2:26 Sean Christopherson
2026-05-27 2:59 ` 回复：[PATCH " 快乐豆豆
2026-05-29 22:47 ` Sean Christopherson [this message]
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