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bh=xztyG79L4WZz3/XfQmASCFgqS3tqfERWok+izO0A6ew=; b=OA4/QSBMefMJzxTrMvxHNClHs7C+LJLC9gj2Nm20497U1ijZVgis30qwkuBbRF7gMH5sYU BrkwDdJ08qXovEPdFFOrpwxLxdyvFxMtCyO/cQGIc3hvxvYl0Bs6OJIAzC52HR1256glgy Lj+dflUOpBTDsekm8wktASP/1I5UVDg= X-MC-Unique: QjN_jCw4MdywH_9blJZ2nQ-1 From: Vitaly Kuznetsov To: qemu-devel@nongnu.org Subject: [PATCH RFC v3 22/23] i386: expand Hyper-V features during CPU feature expansion time Date: Fri, 9 Oct 2020 14:18:41 +0200 Message-Id: <20201009121842.1938010-23-vkuznets@redhat.com> In-Reply-To: <20201009121842.1938010-1-vkuznets@redhat.com> References: <20201009121842.1938010-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=vkuznets@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; 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charset="utf-8" To make Hyper-V features appear in e.g. QMP query-cpu-model-expansion we need to expand and set the corresponding CPUID leaves early. Modify x86_cpu_get_supported_feature_word() to call newly intoduced Hyper-V specific kvm_hv_get_supported_cpuid() instead of kvm_arch_get_supported_cpuid(). We can't use kvm_arch_get_supported_cpuid() as Hyper-V specific CPUID leaves intersect with KVM's. Note, early expansion will only happen when KVM supports system wide KVM_GET_SUPPORTED_HV_CPUID ioctl (KVM_CAP_SYS_HYPERV_CPUID). Signed-off-by: Vitaly Kuznetsov --- target/i386/cpu.c | 4 ++++ target/i386/kvm-stub.c | 5 +++++ target/i386/kvm.c | 15 ++++++++++++--- target/i386/kvm_i386.h | 1 + 4 files changed, 22 insertions(+), 3 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index bfa3f5515aff..55706c8050fe 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -6347,6 +6347,10 @@ static void x86_cpu_expand_features(X86CPU *cpu, Err= or **errp) if (env->cpuid_xlevel2 =3D=3D UINT32_MAX) { env->cpuid_xlevel2 =3D env->cpuid_min_xlevel2; } + + if (kvm_enabled()) { + kvm_hyperv_expand_features(cpu, errp); + } } =20 /* diff --git a/target/i386/kvm-stub.c b/target/i386/kvm-stub.c index 872ef7df4c88..4abb5afa1168 100644 --- a/target/i386/kvm-stub.c +++ b/target/i386/kvm-stub.c @@ -44,3 +44,8 @@ bool kvm_hv_vpindex_settable(void) { return false; } + +void kvm_hyperv_expand_features(X86CPU *cpu, Error **errp) +{ + return; +} diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 9191c5f18af5..da620f576725 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -1215,13 +1215,22 @@ static uint32_t hv_build_cpuid_leaf(CPUState *cs, u= int32_t func, int reg) * of 'hv_passthrough' mode and fills the environment with all supported * Hyper-V features. */ -static void hyperv_expand_features(CPUState *cs, Error **errp) +void kvm_hyperv_expand_features(X86CPU *cpu, Error **errp) { - X86CPU *cpu =3D X86_CPU(cs); + CPUState *cs =3D CPU(cpu); =20 if (!hyperv_enabled(cpu)) return; =20 + /* + * When kvm_hyperv_expand_features is called at CPU feature expansion + * time per-CPU kvm_state is not available yet so we can only proceed + * when KVM_CAP_SYS_HYPERV_CPUID is supported. + */ + if (!cs->kvm_state && + !kvm_check_extension(kvm_state, KVM_CAP_SYS_HYPERV_CPUID)) + return; + if (cpu->hyperv_passthrough) { cpu->hyperv_vendor_id[0] =3D hv_cpuid_get_host(cs, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, R_EBX= ); @@ -1554,7 +1563,7 @@ int kvm_arch_init_vcpu(CPUState *cs) env->apic_bus_freq =3D KVM_APIC_BUS_FREQUENCY; =20 /* Paravirtualization CPUIDs */ - hyperv_expand_features(cs, &local_err); + kvm_hyperv_expand_features(cpu, &local_err); if (local_err) { error_report_err(local_err); return -ENOSYS; diff --git a/target/i386/kvm_i386.h b/target/i386/kvm_i386.h index 0fce4e51d2d6..38af4a967968 100644 --- a/target/i386/kvm_i386.h +++ b/target/i386/kvm_i386.h @@ -48,5 +48,6 @@ bool kvm_has_x2apic_api(void); bool kvm_has_waitpkg(void); =20 bool kvm_hv_vpindex_settable(void); +void kvm_hyperv_expand_features(X86CPU *cpu, Error **errp); =20 #endif --=20 2.25.4