diff options
| author | Jing Liu <jing2.liu@intel.com> | 2022-01-05 15:35:15 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-01-07 21:33:04 +0300 |
| commit | 445ecdf79be0c71ca248f7611aeefceaea3ec59f (patch) | |
| tree | de6de4d866343a9cddb7e1f0715e359f587eb211 /include | |
| parent | cc04b6a21d431359eceeec0d812b492088b04af5 (diff) | |
| download | linux-445ecdf79be0c71ca248f7611aeefceaea3ec59f.tar.xz | |
kvm: x86: Exclude unpermitted xfeatures at KVM_GET_SUPPORTED_CPUID
KVM_GET_SUPPORTED_CPUID should not include any dynamic xstates in
CPUID[0xD] if they have not been requested with prctl. Otherwise
a process which directly passes KVM_GET_SUPPORTED_CPUID to
KVM_SET_CPUID2 would now fail even if it doesn't intend to use a
dynamically enabled feature. Userspace must know that prctl is
required and allocate >4K xstate buffer before setting any dynamic
bit.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jing Liu <jing2.liu@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20220105123532.12586-5-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions