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authorJim Mattson <jmattson@google.com>2018-05-24 11:59:54 -0700
committerRadim Krčmář <rkrcmar@redhat.com>2018-05-26 15:37:34 +0200
commitdf9cb9cc5bcd36127a820c09b4c40adfdc17c547 (patch)
tree72807026f8d9a48b86a06adc72a7ed597956df74 /Documentation/virtual
parentc1aea9196ef4f6b64a8ef7e62a933f7e4164aed9 (diff)
downloadlinux-df9cb9cc5bcd36127a820c09b4c40adfdc17c547.tar.bz2
kvm: x86: Amend the KVM_GET_SUPPORTED_CPUID API documentation
Document the subtle nuances that KVM_CAP_X86_DISABLE_EXITS induces in the KVM_GET_SUPPORTED_CPUID API. Fixes: 4d5422cea3b6 ("KVM: X86: Provide a capability to disable MWAIT intercepts") Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/api.txt18
1 files changed, 12 insertions, 6 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index c563da4244da..495b7742ab58 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1269,12 +1269,18 @@ struct kvm_cpuid_entry2 {
__u32 padding[3];
};
-This ioctl returns x86 cpuid features which are supported by both the hardware
-and kvm. Userspace can use the information returned by this ioctl to
-construct cpuid information (for KVM_SET_CPUID2) that is consistent with
-hardware, kernel, and userspace capabilities, and with user requirements (for
-example, the user may wish to constrain cpuid to emulate older hardware,
-or for feature consistency across a cluster).
+This ioctl returns x86 cpuid features which are supported by both the
+hardware and kvm in its default configuration. Userspace can use the
+information returned by this ioctl to construct cpuid information (for
+KVM_SET_CPUID2) that is consistent with hardware, kernel, and
+userspace capabilities, and with user requirements (for example, the
+user may wish to constrain cpuid to emulate older hardware, or for
+feature consistency across a cluster).
+
+Note that certain capabilities, such as KVM_CAP_X86_DISABLE_EXITS, may
+expose cpuid features (e.g. MONITOR) which are not supported by kvm in
+its default configuration. If userspace enables such capabilities, it
+is responsible for modifying the results of this ioctl appropriately.
Userspace invokes KVM_GET_SUPPORTED_CPUID by passing a kvm_cpuid2 structure
with the 'nent' field indicating the number of entries in the variable-size