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AJvYcCXmAZmGO1sNL7pxzd40n0zBrha0HKa1gGwyaGvUYmkGzDLkArKev1E/0oeT96ugx58AHi6oCj8gAS9cXAfbUHSCQe28fG0wAAp70DuChDgd X-Gm-Message-State: AOJu0Yza4j5lFpdEx3I5g+RlqcXTt0FBW2XqUztkgZcV/cu6SMdGcl7S 4d2gX20uM2vwmfQKRcehu3eRYVrpy2XFu+cLBWrYo/m4lX1WQNuQQmR4bjhTBydCKLlDwrEOUYJ 8HQ== X-Google-Smtp-Source: AGHT+IGpMP0YQDlOCYIQIVWZSRBk825/2I3DscRy5g+RvmAsPoOTYF5t3/qW64MoZp/92K3S7nX8p21Z3KE= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6a00:2da1:b0:705:d750:83f4 with SMTP id d2e1a72fcca58-705d7508823mr1219b3a.3.1718302303033; Thu, 13 Jun 2024 11:11:43 -0700 (PDT) Date: Thu, 13 Jun 2024 11:11:41 -0700 In-Reply-To: <20240207172646.3981-18-xin3.li@intel.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240207172646.3981-1-xin3.li@intel.com> <20240207172646.3981-18-xin3.li@intel.com> Message-ID: Subject: Re: [PATCH v2 17/25] KVM: nVMX: Add support for the secondary VM exit controls 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: > @@ -6856,13 +6865,17 @@ static void nested_vmx_setup_exit_ctls(struct vmcs_config *vmcs_conf, > VM_EXIT_HOST_ADDR_SPACE_SIZE | > #endif > VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT | > - VM_EXIT_CLEAR_BNDCFGS; > + VM_EXIT_CLEAR_BNDCFGS | VM_EXIT_ACTIVATE_SECONDARY_CONTROLS; > msrs->exit_ctls_high |= > VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR | > VM_EXIT_LOAD_IA32_EFER | VM_EXIT_SAVE_IA32_EFER | > VM_EXIT_SAVE_VMX_PREEMPTION_TIMER | VM_EXIT_ACK_INTR_ON_EXIT | > VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL; > > + /* secondary exit controls */ Drop the comment, it's pretty obvious what field is being setup. > + if (msrs->exit_ctls_high & VM_EXIT_ACTIVATE_SECONDARY_CONTROLS) > + rdmsrl(MSR_IA32_VMX_EXIT_CTLS2, msrs->secondary_exit_ctls); This is wrong, the resulting msrs->secondary_exit_ctls needs to be sanitized based on what KVM supports for nVMX. On a very related topic, this should not do a raw RDMSR. One of the reasons why KVM uses vmcs_config as the base is to avoid advertising features to L1 that KVM itself doesn't support, e.g. because the expected entry+exit pairs aren't supported. And by pulling state from vmcs_conf->secondary_exit_ctls there's no need to check the activation bit. I.e. literaly just this: msrs->secondary_exit_ctls = vmcs_conf->secondary_exit_ctls; msrs->secondary_exit_ctls &= 0; and then when nVMX FRED support is ready, it becomes: msrs->secondary_exit_ctls = vmcs_conf->secondary_exit_ctls; msrs->secondary_exit_ctls &= SECONDARY_VM_EXIT_SAVE_IA32_FRED | SECONDARY_VM_EXIT_LOAD_IA32_FRED;