diff options
| author | Vitaly Kuznetsov | 2021-09-02 11:35:26 +0200 |
|---|---|---|
| committer | Paolo Bonzini | 2021-10-01 19:04:45 +0200 |
| commit | 70367f091777419f42e5f68f4206deb641335877 (patch) | |
| tree | 99fc953aad6b0a2f8d998d3f640bcb873ab86f65 /target/i386/kvm/kvm.c | |
| parent | i386: Support KVM_CAP_ENFORCE_PV_FEATURE_CPUID (diff) | |
| download | qemu-70367f091777419f42e5f68f4206deb641335877.tar.gz qemu-70367f091777419f42e5f68f4206deb641335877.tar.xz qemu-70367f091777419f42e5f68f4206deb641335877.zip | |
i386: Support KVM_CAP_HYPERV_ENFORCE_CPUID
By default, KVM allows the guest to use all currently supported Hyper-V
enlightenments when Hyper-V CPUID interface was exposed, regardless of if
some features were not announced in guest visible CPUIDs. hv-enforce-cpuid
feature alters this behavior and only allows the guest to use exposed
Hyper-V enlightenments. The feature is supported by Linux >= 5.14 and is
not enabled by default in QEMU.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20210902093530.345756-5-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target/i386/kvm/kvm.c')
| -rw-r--r-- | target/i386/kvm/kvm.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index d6a70c27e5..fbe6b7ac72 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -1531,6 +1531,15 @@ static int hyperv_init_vcpu(X86CPU *cpu) cpu->hyperv_nested[0] = evmcs_version; } + if (cpu->hyperv_enforce_cpuid) { + ret = kvm_vcpu_enable_cap(cs, KVM_CAP_HYPERV_ENFORCE_CPUID, 0, 1); + if (ret < 0) { + error_report("failed to enable KVM_CAP_HYPERV_ENFORCE_CPUID: %s", + strerror(-ret)); + return ret; + } + } + return 0; } |