From: Chao Gao <chao.gao@intel.com>
To: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, <kvm@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
Mathias Krause <minipli@grsecurity.net>,
"John Allen" <john.allen@amd.com>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
Binbin Wu <binbin.wu@linux.intel.com>,
Xiaoyao Li <xiaoyao.li@intel.com>,
"Jim Mattson" <jmattson@google.com>
Subject: Re: [PATCH 2/3] KVM: x86: Harden against unexpected adjustments to kvm_cpu_caps
Date: Tue, 27 Jan 2026 15:47:33 +0800 [thread overview]
Message-ID: <aXhtlcLi+M1MUT3t@intel.com> (raw)
In-Reply-To: <20260123221542.2498217-3-seanjc@google.com>
On Fri, Jan 23, 2026 at 02:15:41PM -0800, Sean Christopherson wrote:
>Add a flag to track when KVM is actively configuring its CPU caps, and
>WARN if a cap is set or cleared if KVM isn't in its configuration stage.
>Modifying CPU caps after {svm,vmx}_set_cpu_caps() can be fatal to KVM, as
>vendor setup code expects the CPU caps to be frozen at that point, e.g.
>will do additional configuration based on the caps.
>
>Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Chao Gao <chao.gao@intel.com>
next prev parent reply other threads:[~2026-01-27 7:47 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-23 22:15 [PATCH 0/3] KVM: x86: CET vs. nVMX fix and hardening Sean Christopherson
2026-01-23 22:15 ` [PATCH 1/3] KVM: x86: Finalize kvm_cpu_caps setup from {svm,vmx}_set_cpu_caps() Sean Christopherson
2026-01-27 7:42 ` Chao Gao
2026-01-27 15:12 ` Xiaoyao Li
2026-01-27 16:19 ` Sean Christopherson
2026-01-23 22:15 ` [PATCH 2/3] KVM: x86: Harden against unexpected adjustments to kvm_cpu_caps Sean Christopherson
2026-01-27 7:47 ` Chao Gao [this message]
2026-01-23 22:15 ` [PATCH 3/3] KVM: VMX: Print out "bad" offsets+value on VMCS config mismatch Sean Christopherson
2026-01-26 14:57 ` Sean Christopherson
2026-01-27 7:53 ` Chao Gao
2026-01-27 18:59 ` Sean Christopherson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=aXhtlcLi+M1MUT3t@intel.com \
--to=chao.gao@intel.com \
--cc=binbin.wu@linux.intel.com \
--cc=jmattson@google.com \
--cc=john.allen@amd.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=minipli@grsecurity.net \
--cc=pbonzini@redhat.com \
--cc=rick.p.edgecombe@intel.com \
--cc=seanjc@google.com \
--cc=xiaoyao.li@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.