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i386: Support KVM_CAP_HYPERV_ENFORCE_CPUID

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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>
This commit is contained in:
Vitaly Kuznetsov 2021-09-02 11:35:26 +02:00 • committed by Paolo Bonzini
parent 988f7b8bfe
commit 70367f0917
4 changed files with 25 additions and 3 deletions
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9
target/i386/kvm/kvm.c
View file

@ -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;
}