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[213.175.37.10]) by smtp.gmail.com with ESMTPSA id t81sm16712936wmb.15.2020.03.13.06.55.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Mar 2020 06:55:39 -0700 (PDT) From: Vitaly Kuznetsov To: Sean Christopherson Cc: Paolo Bonzini , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Xiaoyao Li Subject: Re: [PATCH 06/10] KVM: nVMX: Convert local exit_reason to u16 in ...enter_non_root_mode() In-Reply-To: <20200312184521.24579-7-sean.j.christopherson@intel.com> References: <20200312184521.24579-1-sean.j.christopherson@intel.com> <20200312184521.24579-7-sean.j.christopherson@intel.com> Date: Fri, 13 Mar 2020 14:55:38 +0100 Message-ID: <87pndgnyud.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sean Christopherson writes: > Use a u16 for nested_vmx_enter_non_root_mode()'s local "exit_reason" to > make it clear the intermediate code is only responsible for setting the > basic exit reason, e.g. FAILED_VMENTRY is unconditionally OR'd in when > emulating a failed VM-Entry. > > No functional change intended. > > Signed-off-by: Sean Christopherson > --- > arch/x86/kvm/vmx/nested.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c > index 1848ca0116c0..8fbbe2152ab7 100644 > --- a/arch/x86/kvm/vmx/nested.c > +++ b/arch/x86/kvm/vmx/nested.c > @@ -3182,7 +3182,7 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, > struct vcpu_vmx *vmx = to_vmx(vcpu); > struct vmcs12 *vmcs12 = get_vmcs12(vcpu); > bool evaluate_pending_interrupts; > - u32 exit_reason = EXIT_REASON_INVALID_STATE; > + u16 exit_reason = EXIT_REASON_INVALID_STATE; > u32 exit_qual; > > evaluate_pending_interrupts = exec_controls_get(vmx) & > @@ -3308,7 +3308,7 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, > return NVMX_VMENTRY_VMEXIT; > > load_vmcs12_host_state(vcpu, vmcs12); > - vmcs12->vm_exit_reason = exit_reason | VMX_EXIT_REASONS_FAILED_VMENTRY; > + vmcs12->vm_exit_reason = VMX_EXIT_REASONS_FAILED_VMENTRY | exit_reason; My personal preference would be to do (u32)exit_reason | VMX_EXIT_REASONS_FAILED_VMENTRY instead but maybe I'm just not in love with implicit type convertion in C. > vmcs12->exit_qualification = exit_qual; > if (enable_shadow_vmcs || vmx->nested.hv_evmcs) > vmx->nested.need_vmcs12_to_shadow_sync = true; Reviewed-by: Vitaly Kuznetsov -- Vitaly