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[91.219.240.2]) by smtp.gmail.com with ESMTPSA id n124sm1475093wma.11.2020.04.01.00.08.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Apr 2020 00:08:15 -0700 (PDT) From: Vitaly Kuznetsov To: "Dr. David Alan Gilbert" Subject: Re: [PATCH] target/i386: do not set unsupported VMX secondary execution controls In-Reply-To: <20200331172640.GE2896@work-vm> References: <20200331162752.1209928-1-vkuznets@redhat.com> <20200331172640.GE2896@work-vm> Date: Wed, 01 Apr 2020 09:08:13 +0200 Message-ID: <874ku31y5e.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Habkost , "Montes, Julio" , Marcelo Tosatti , "qemu-devel@nongnu.org" , Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" "Dr. David Alan Gilbert" writes: > So you would think that would tkae care of RDSEED exiting - but what > about VMCS shadowing? > SECONDARY_EXEC_SHADOW_VMCS is special, we are able to emulate it in KVM even when it is not supported by hardware, see nested_vmx_setup_ctls_msrs(): =09/* =09 * We can emulate "VMCS shadowing," even if the hardware =09 * doesn't support it. =09 */ =09msrs->secondary_ctls_high |=3D =09=09SECONDARY_EXEC_SHADOW_VMCS; --=20 Vitaly