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[91.219.240.8]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42bbef54b23sm141833145e9.44.2024.09.03.09.20.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Sep 2024 09:20:27 -0700 (PDT) From: Vitaly Kuznetsov To: Sean Christopherson Cc: Yan Zhao , Gerd Hoffmann , Paolo Bonzini , kvm@vger.kernel.org, rcu@vger.kernel.org, linux-kernel@vger.kernel.org, Kevin Tian , Yiwei Zhang , Lai Jiangshan , "Paul E. McKenney" , Josh Triplett Subject: Re: [PATCH 5/5] KVM: VMX: Always honor guest PAT on CPUs that support self-snoop In-Reply-To: References: <20240309010929.1403984-1-seanjc@google.com> <20240309010929.1403984-6-seanjc@google.com> <877cbyuzdn.fsf@redhat.com> <871q26unq8.fsf@redhat.com> <87jzfutmfc.fsf@redhat.com> Date: Tue, 03 Sep 2024 18:20:27 +0200 Message-ID: <87frqgu2t0.fsf@redhat.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Sean Christopherson writes: > On Mon, Sep 02, 2024, Vitaly Kuznetsov wrote: >> FWIW, I use QEMU-9.0 from the same C10S (qemu-kvm-9.0.0-7.el10.x86_64) >> but I don't think it matters in this case. My CPU is "Intel(R) Xeon(R) >> Silver 4410Y". > > Has this been reproduced on any other hardware besides SPR? I.e. did we stumble > on another hardware issue? Very possible, as according to Yan Zhao this doesn't reproduce on at least "Coffee Lake-S". Let me try to grab some random hardware around and I'll be back with my observations. -- Vitaly