From f6e01ab5633da17d3c5e346bf07d01af12d39b9b Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Thu, 22 Apr 2021 18:11:20 +0200 Subject: [PATCH] i386: split hyperv_handle_properties() into hyperv_expand_features()/hyperv_fill_cpuids() The intention is to call hyperv_expand_features() early, before vCPUs are created and use the acquired data later when we set guest visible CPUID data. Signed-off-by: Vitaly Kuznetsov Reviewed-by: Eduardo Habkost Message-Id: <20210422161130.652779-10-vkuznets@redhat.com> Signed-off-by: Eduardo Habkost --- target/i386/kvm/kvm.c | 34 ++++++++++++++++++++++++---------- 1 file changed, 24 insertions(+), 10 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 2dd60fcaac..10c836a2bf 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -1187,16 +1187,15 @@ static uint32_t hv_build_cpuid_leaf(CPUState *cs, uint32_t func, int reg) } /* - * Fill in Hyper-V CPUIDs. Returns the number of entries filled in cpuid_ent in - * case of success, errno < 0 in case of failure and 0 when no Hyper-V - * extentions are enabled. + * Expand Hyper-V CPU features. In partucular, check that all the requested + * features are supported by the host and the sanity of the configuration + * (that all the required dependencies are included). Also, this takes care + * of 'hv_passthrough' mode and fills the environment with all supported + * Hyper-V features. */ -static int hyperv_handle_properties(CPUState *cs, - struct kvm_cpuid_entry2 *cpuid_ent) +static int hyperv_expand_features(CPUState *cs) { X86CPU *cpu = X86_CPU(cs); - struct kvm_cpuid_entry2 *c; - uint32_t cpuid_i = 0; int r; if (!hyperv_enabled(cpu)) @@ -1295,6 +1294,19 @@ static int hyperv_handle_properties(CPUState *cs, return -ENOSYS; } + return 0; +} + +/* + * Fill in Hyper-V CPUIDs. Returns the number of entries filled in cpuid_ent. + */ +static int hyperv_fill_cpuids(CPUState *cs, + struct kvm_cpuid_entry2 *cpuid_ent) +{ + X86CPU *cpu = X86_CPU(cs); + struct kvm_cpuid_entry2 *c; + uint32_t cpuid_i = 0; + c = &cpuid_ent[cpuid_i++]; c->function = HV_CPUID_VENDOR_AND_MAX_FUNCTIONS; c->eax = hyperv_feat_enabled(cpu, HYPERV_FEAT_EVMCS) ? @@ -1502,11 +1514,13 @@ int kvm_arch_init_vcpu(CPUState *cs) env->apic_bus_freq = KVM_APIC_BUS_FREQUENCY; /* Paravirtualization CPUIDs */ - r = hyperv_handle_properties(cs, cpuid_data.entries); + r = hyperv_expand_features(cs); if (r < 0) { return r; - } else if (r > 0) { - cpuid_i = r; + } + + if (hyperv_enabled(cpu)) { + cpuid_i = hyperv_fill_cpuids(cs, cpuid_data.entries); kvm_base = KVM_CPUID_SIGNATURE_NEXT; has_msr_hv_hypercall = true; }