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bh=bbtrO+37cFttzFZAyBMwpUbGiI9V5ZD2swnhvaKMJMk=; b=AHFflM4g4okpSo7zUcdjhtzqpzASdwm9WAfqYPLK2JdJaco3KJE7XLbcyhNeWszUzWR3lq QuPqp+FGcblCm75PterH7xQozjEyHYKunNVzpXNgnZMTd2h4uN9iYGWKsnC2xRj5YsJTJ8 o4DsHw3pq8GAQVuhJF6zxNr85fcrEfo= X-MC-Unique: 4D1mg-fxPKSVm8Ge-BFTwQ-1 From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PATCH] target/i386: kvm: do not use kvm_check_extension to find paravirtual capabilities Date: Tue, 22 Sep 2020 23:02:16 -0400 Message-Id: <20200923030216.1527921-2-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable 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=216.205.24.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/22 23:02:20 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.455, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=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 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ehabkost@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" Paravirtualized features have been listed in KVM_GET_SUPPORTED_CPUID since Linux 2.6.35 (commit 84478c829d0f, "KVM: x86: export paravirtual cpuid flags in KVM_GET_SUPPORTED_CPUID", 2010-05-19). It has been more than 10 years, so remove the fallback code. Signed-off-by: Paolo Bonzini --- target/i386/kvm.c | 32 -------------------------------- 1 file changed, 32 deletions(-) diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 3996cf9764..ccc65ad0f5 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -279,30 +279,6 @@ static struct kvm_cpuid2 *get_supported_cpuid(KVMState= *s) return cpuid; } =20 -static const struct kvm_para_features { - int cap; - int feature; -} para_features[] =3D { - { KVM_CAP_CLOCKSOURCE, KVM_FEATURE_CLOCKSOURCE }, - { KVM_CAP_NOP_IO_DELAY, KVM_FEATURE_NOP_IO_DELAY }, - { KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP }, - { KVM_CAP_ASYNC_PF, KVM_FEATURE_ASYNC_PF }, - { KVM_CAP_ASYNC_PF_INT, KVM_FEATURE_ASYNC_PF_INT }, -}; - -static int get_para_features(KVMState *s) -{ - int i, features =3D 0; - - for (i =3D 0; i < ARRAY_SIZE(para_features); i++) { - if (kvm_check_extension(s, para_features[i].cap)) { - features |=3D (1 << para_features[i].feature); - } - } - - return features; -} - static bool host_tsx_broken(void) { int family, model, stepping;\ @@ -362,13 +338,11 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s, ui= nt32_t function, struct kvm_cpuid2 *cpuid; uint32_t ret =3D 0; uint32_t cpuid_1_edx; - bool found =3D false; =20 cpuid =3D get_supported_cpuid(s); =20 struct kvm_cpuid_entry2 *entry =3D cpuid_find_entry(cpuid, function, i= ndex); if (entry) { - found =3D true; ret =3D cpuid_entry_get_reg(entry, reg); } =20 @@ -443,12 +417,6 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s, uin= t32_t function, } } else if (function =3D=3D KVM_CPUID_FEATURES && reg =3D=3D R_EDX) { ret |=3D 1U << KVM_HINTS_REALTIME; - found =3D 1; - } - - /* fallback for older kernels */ - if ((function =3D=3D KVM_CPUID_FEATURES) && !found) { - ret =3D get_para_features(s); } =20 return ret; --=20 2.26.2