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AJvYcCXJQsu9USYaOMzkh7RYY/688/425wQKQdSF+Yn0kbH65o9pu+uDimdexJBEY+yoX4aW351mDSOr9Or+ofe+gWvdpRmR+DbIV1e3 X-Gm-Message-State: AOJu0YzfXnBcliUL0wyFlEv9fpmmoB0jnvt0LwPmXZ+yDfxoUxMkCECT CFOlcRCUT5IRjHvizG367a7qq3NSQ1DITTNt5UUNanTqNvoRbYZHLQEDGZyr+IC8mE3dzX97Lo+ SXw== X-Google-Smtp-Source: AGHT+IF236fVTqan1xeFH5dPPmgc0NM7zLynRwigfEMIC3iJa54rvvA/hW7i8p+BK04gMU89grxKlGMEn9I= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:903:234f:b0:1f3:f8c:55d5 with SMTP id d9443c01a7336-1f83b55b4b7mr84625ad.2.1718227252048; Wed, 12 Jun 2024 14:20:52 -0700 (PDT) Date: Wed, 12 Jun 2024 14:20:50 -0700 In-Reply-To: <20240207172646.3981-8-xin3.li@intel.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240207172646.3981-1-xin3.li@intel.com> <20240207172646.3981-8-xin3.li@intel.com> Message-ID: Subject: Re: [PATCH v2 07/25] KVM: VMX: Set intercept for FRED MSRs From: Sean Christopherson To: Xin Li Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, pbonzini@redhat.com, corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, shuah@kernel.org, vkuznets@redhat.com, peterz@infradead.org, ravi.v.shankar@intel.com, xin@zytor.com Content-Type: text/plain; charset="us-ascii" On Wed, Feb 07, 2024, Xin Li wrote: > @@ -7774,10 +7777,12 @@ static void update_intel_pt_cfg(struct kvm_vcpu *vcpu) > static void vmx_vcpu_config_fred_after_set_cpuid(struct kvm_vcpu *vcpu) > { > struct vcpu_vmx *vmx = to_vmx(vcpu); > + bool fred_enumerated; > > kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_FRED); > + fred_enumerated = guest_can_use(vcpu, X86_FEATURE_FRED); "enumerated" isn't correct. Userspace can enumerate FRED to the guest even if FRED is unsupported in KVM. Planning for a future where this becomes guest_cpu_cap_has(), maybe "has_fred"? > - if (guest_can_use(vcpu, X86_FEATURE_FRED)) { > + if (fred_enumerated) { > vm_entry_controls_setbit(vmx, VM_ENTRY_LOAD_IA32_FRED); > secondary_vm_exit_controls_setbit(vmx, > SECONDARY_VM_EXIT_SAVE_IA32_FRED | > @@ -7788,6 +7793,16 @@ static void vmx_vcpu_config_fred_after_set_cpuid(struct kvm_vcpu *vcpu) > SECONDARY_VM_EXIT_SAVE_IA32_FRED | > SECONDARY_VM_EXIT_LOAD_IA32_FRED); > } > + > + vmx_set_intercept_for_msr(vcpu, MSR_IA32_FRED_RSP0, MSR_TYPE_RW, !fred_enumerated); > + vmx_set_intercept_for_msr(vcpu, MSR_IA32_FRED_RSP1, MSR_TYPE_RW, !fred_enumerated); > + vmx_set_intercept_for_msr(vcpu, MSR_IA32_FRED_RSP2, MSR_TYPE_RW, !fred_enumerated); > + vmx_set_intercept_for_msr(vcpu, MSR_IA32_FRED_RSP3, MSR_TYPE_RW, !fred_enumerated); > + vmx_set_intercept_for_msr(vcpu, MSR_IA32_FRED_STKLVLS, MSR_TYPE_RW, !fred_enumerated); > + vmx_set_intercept_for_msr(vcpu, MSR_IA32_FRED_SSP1, MSR_TYPE_RW, !fred_enumerated); > + vmx_set_intercept_for_msr(vcpu, MSR_IA32_FRED_SSP2, MSR_TYPE_RW, !fred_enumerated); > + vmx_set_intercept_for_msr(vcpu, MSR_IA32_FRED_SSP3, MSR_TYPE_RW, !fred_enumerated); > + vmx_set_intercept_for_msr(vcpu, MSR_IA32_FRED_CONFIG, MSR_TYPE_RW, !fred_enumerated); > } > > static void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) > -- > 2.43.0 >