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X-IronPort-AV: E=Sophos;i="5.82,325,1613433600"; d="scan'208";a="136607583" From: Siddharth Chandrasekaran To: Paolo Bonzini , Marcelo Tosatti CC: Siddharth Chandrasekaran , Siddharth Chandrasekaran , Alexander Graf , Evgeny Iakovlev , Liran Alon , Ioannis Aslanidis , , Subject: [PATCH 4/6] kvm/i386: Avoid multiple calls to check_extension(KVM_CAP_HYPERV) Date: Mon, 24 May 2021 21:54:07 +0200 Message-ID: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [10.43.161.253] X-ClientProxiedBy: EX13D10UWB004.ant.amazon.com (10.43.161.121) To EX13D28EUC003.ant.amazon.com (10.43.164.43) Precedence: Bulk Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=207.171.184.29; envelope-from=prvs=771b08666=sidcha@amazon.de; helo=smtp-fw-9102.amazon.com X-Spam_score_int: -74 X-Spam_score: -7.5 X-Spam_bar: ------- X-Spam_report: (-7.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.371, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @amazon.de) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" KVM_CAP_HYPERV is a VM ioctl and can be cached at kvm_arch_init() instead of performing an ioctl each time in hyperv_enabled() which is called foreach vCPU. Apart from that, this variable will come in handy in a subsequent patch. Signed-off-by: Siddharth Chandrasekaran Reviewed-by: Alexander Graf --- target/i386/kvm/kvm.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index d19a2913fd..362f04ab3f 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -93,6 +93,7 @@ static bool has_msr_misc_enable; static bool has_msr_smbase; static bool has_msr_bndcfgs; static int lm_capable_kernel; +static bool has_hyperv; static bool has_msr_hv_hypercall; static bool has_msr_hv_crash; static bool has_msr_hv_reset; @@ -715,8 +716,7 @@ unsigned long kvm_arch_vcpu_id(CPUState *cs) =20 static bool hyperv_enabled(X86CPU *cpu) { - CPUState *cs =3D CPU(cpu); - return kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV) > 0 && + return has_hyperv && ((cpu->hyperv_spinlock_attempts !=3D HYPERV_SPINLOCK_NEVER_NOTIFY)= || cpu->hyperv_features || cpu->hyperv_passthrough); } @@ -2172,6 +2172,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s) has_xsave =3D kvm_check_extension(s, KVM_CAP_XSAVE); has_xcrs =3D kvm_check_extension(s, KVM_CAP_XCRS); has_pit_state2 =3D kvm_check_extension(s, KVM_CAP_PIT_STATE2); + has_hyperv =3D kvm_check_extension(s, KVM_CAP_HYPERV); =20 hv_vpindex_settable =3D kvm_check_extension(s, KVM_CAP_HYPERV_VP_INDEX= ); =20 --=20 2.17.1 Amazon Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B Sitz: Berlin Ust-ID: DE 289 237 879