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AJvYcCUWA5IZ8gcdvhZWF6pFwXC3bKseTQlxjYYXpxWyQrH4tLhR6muXuNTW5QgcwSHuVXbbmAmRj76MAX3hx19vD1D7gkNjOk/+LPZsxdUkBcvvTA== X-Gm-Message-State: AOJu0YxPZRVdBACf/zU5yS/iuQALmiPsYQEA7VpdwW4ZGIAU0LtAgWmT oBAsJ2Py7GlksYpuqe4COZVssbRRJHJPOJ3NdBNedI1wktCuWZLVUnF2CfHe793tmJsCu1bKLm2 wrg== X-Google-Smtp-Source: AGHT+IGkE+X2zxbr1hHNUpWg21uobjE0x+B1Mp3y6MyplpSZTK7tHQrQsbMRcsPEdX3tPdwzxY1iWabyoHQ= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a63:7157:0:b0:5f0:5034:1c21 with SMTP id b23-20020a637157000000b005f050341c21mr2010pgn.12.1712872599915; Thu, 11 Apr 2024 14:56:39 -0700 (PDT) Date: Thu, 11 Apr 2024 14:56:38 -0700 In-Reply-To: <20240126085444.324918-37-xiong.y.zhang@linux.intel.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240126085444.324918-1-xiong.y.zhang@linux.intel.com> <20240126085444.324918-37-xiong.y.zhang@linux.intel.com> Message-ID: Subject: Re: [RFC PATCH 36/41] KVM: x86/pmu: Intercept FIXED_CTR_CTRL MSR From: Sean Christopherson To: Xiong Zhang Cc: pbonzini@redhat.com, peterz@infradead.org, mizhang@google.com, kan.liang@intel.com, zhenyuw@linux.intel.com, dapeng1.mi@linux.intel.com, jmattson@google.com, kvm@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, zhiyuan.lv@intel.com, eranian@google.com, irogers@google.com, samantha.alt@intel.com, like.xu.linux@gmail.com, chao.gao@intel.com, Xiong Zhang Content-Type: text/plain; charset="us-ascii" On Fri, Jan 26, 2024, Xiong Zhang wrote: > From: Xiong Zhang > > Fixed counters control MSR are still intercepted for the purpose of > security, i.e., preventing guest from using unallowed Fixed Counter > to steal information or take advantages of any CPU errata. Same comments as earlier patches. Don't introduce bugs and then immediately fix said bugs.