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([2001:b07:add:ec09:c399:bc87:7b6c:fb2a]) by smtp.googlemail.com with ESMTPSA id q128-20020a1c4386000000b003915e19d47asm2301976wma.32.2022.04.15.07.29.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 15 Apr 2022 07:29:59 -0700 (PDT) Sender: Paolo Bonzini Message-ID: Date: Fri, 15 Apr 2022 16:29:56 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [RFC PATCH v5 085/104] KVM: TDX: handle EXIT_REASON_OTHER_SMI Content-Language: en-US To: isaku.yamahata@intel.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: isaku.yamahata@gmail.com, Jim Mattson , erdemaktas@google.com, Connor Kuehl , Sean Christopherson References: From: Paolo Bonzini In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/4/22 20:49, isaku.yamahata@intel.com wrote: > From: Isaku Yamahata > > If the control reaches EXIT_REASON_OTHER_SMI, #SMI is delivered and > handled right after returning from the TDX module to KVM nothing needs to > be done in KVM. Continue TDX vcpu execution. > > Signed-off-by: Isaku Yamahata > --- > arch/x86/include/uapi/asm/vmx.h | 1 + > arch/x86/kvm/vmx/tdx.c | 7 +++++++ > 2 files changed, 8 insertions(+) > > diff --git a/arch/x86/include/uapi/asm/vmx.h b/arch/x86/include/uapi/asm/vmx.h > index 946d761adbd3..3d9b4598e166 100644 > --- a/arch/x86/include/uapi/asm/vmx.h > +++ b/arch/x86/include/uapi/asm/vmx.h > @@ -34,6 +34,7 @@ > #define EXIT_REASON_TRIPLE_FAULT 2 > #define EXIT_REASON_INIT_SIGNAL 3 > #define EXIT_REASON_SIPI_SIGNAL 4 > +#define EXIT_REASON_OTHER_SMI 6 > > #define EXIT_REASON_INTERRUPT_WINDOW 7 > #define EXIT_REASON_NMI_WINDOW 8 > diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c > index 155208a8d768..6fbe89bcfe1e 100644 > --- a/arch/x86/kvm/vmx/tdx.c > +++ b/arch/x86/kvm/vmx/tdx.c > @@ -1097,6 +1097,13 @@ int tdx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t fastpath) > WARN_ON_ONCE(fastpath != EXIT_FASTPATH_NONE); > > switch (exit_reason.basic) { > + case EXIT_REASON_OTHER_SMI: > + /* > + * If reach here, it's not a MSMI. Please expand MSMI. Otherwise, Reviewed-by: Paolo Bonzini Paolo > + * #SMI is delivered and handled right after SEAMRET, nothing > + * needs to be done in KVM. > + */ > + return 1; > default: > break; > }