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authorVitaly Kuznetsov <vkuznets@redhat.com>2021-05-21 11:51:36 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2021-06-17 13:09:38 -0400
commit644f706719f0297bc5f65c8891de1c32f042eae5 (patch)
tree52bc3f0c3d4dfcc9f9af9a0672fd078a5cde5bda /Documentation/virt
parentf15cdceab543059a9afd9e6277cf15d56d7dfd82 (diff)
downloadlinux-644f706719f0297bc5f65c8891de1c32f042eae5.tar.bz2
KVM: x86: hyper-v: Introduce KVM_CAP_HYPERV_ENFORCE_CPUID
Modeled after KVM_CAP_ENFORCE_PV_FEATURE_CPUID, the new capability allows for limiting Hyper-V features to those exposed to the guest in Hyper-V CPUIDs (0x40000003, 0x40000004, ...). Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20210521095204.2161214-3-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/virt')
-rw-r--r--Documentation/virt/kvm/api.rst11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 7fcb2fd38f42..80154d5d98a1 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -6891,3 +6891,14 @@ This capability is always enabled.
This capability indicates that the KVM virtual PTP service is
supported in the host. A VMM can check whether the service is
available to the guest on migration.
+
+8.33 KVM_CAP_HYPERV_ENFORCE_CPUID
+-----------------------------
+
+Architectures: x86
+
+When enabled, KVM will disable emulated Hyper-V features provided to the
+guest according to the bits Hyper-V CPUID feature leaves. Otherwise, all
+currently implmented Hyper-V features are provided unconditionally when
+Hyper-V identification is set in the HYPERV_CPUID_INTERFACE (0x40000001)
+leaf.