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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2020-03-02 15:56:51 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-03-16 17:58:31 +0100 |
| commit | 7ff6c0350315248bb58b074c90c4683f0e415669 (patch) | |
| tree | 95a189f9a3cb75482d0f929c980053a7e610d27c /Documentation/virt | |
| parent | c571a144ef17217fab0db44a1d88675b7df388ea (diff) | |
| download | linux-7ff6c0350315248bb58b074c90c4683f0e415669.tar.bz2 | |
KVM: x86: Remove stateful CPUID handling
Remove the code for handling stateful CPUID 0x2 and mark the associated
flags as deprecated. WARN if host CPUID 0x2.0.AL > 1, i.e. if by some
miracle a host with stateful CPUID 0x2 is encountered.
No known CPU exists that supports hardware accelerated virtualization
_and_ a stateful CPUID 0x2. Barring an extremely contrived nested
virtualization scenario, stateful CPUID support is dead code.
Suggested-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/virt')
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 22 |
1 files changed, 4 insertions, 18 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 0adef66585b1..b7d4180605ab 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -1574,8 +1574,8 @@ This ioctl would set vcpu's xcr to the value userspace specified. }; #define KVM_CPUID_FLAG_SIGNIFCANT_INDEX BIT(0) - #define KVM_CPUID_FLAG_STATEFUL_FUNC BIT(1) - #define KVM_CPUID_FLAG_STATE_READ_NEXT BIT(2) + #define KVM_CPUID_FLAG_STATEFUL_FUNC BIT(1) /* deprecated */ + #define KVM_CPUID_FLAG_STATE_READ_NEXT BIT(2) /* deprecated */ struct kvm_cpuid_entry2 { __u32 function; @@ -1626,13 +1626,6 @@ emulate them efficiently. The fields in each entry are defined as follows: KVM_CPUID_FLAG_SIGNIFCANT_INDEX: if the index field is valid - KVM_CPUID_FLAG_STATEFUL_FUNC: - if cpuid for this function returns different values for successive - invocations; there will be several entries with the same function, - all with this flag set - KVM_CPUID_FLAG_STATE_READ_NEXT: - for KVM_CPUID_FLAG_STATEFUL_FUNC entries, set if this entry is - the first entry to be read by a cpu eax, ebx, ecx, edx: the values returned by the cpuid instruction for @@ -3347,8 +3340,8 @@ The member 'flags' is used for passing flags from userspace. :: #define KVM_CPUID_FLAG_SIGNIFCANT_INDEX BIT(0) - #define KVM_CPUID_FLAG_STATEFUL_FUNC BIT(1) - #define KVM_CPUID_FLAG_STATE_READ_NEXT BIT(2) + #define KVM_CPUID_FLAG_STATEFUL_FUNC BIT(1) /* deprecated */ + #define KVM_CPUID_FLAG_STATE_READ_NEXT BIT(2) /* deprecated */ struct kvm_cpuid_entry2 { __u32 function; @@ -3394,13 +3387,6 @@ The fields in each entry are defined as follows: KVM_CPUID_FLAG_SIGNIFCANT_INDEX: if the index field is valid - KVM_CPUID_FLAG_STATEFUL_FUNC: - if cpuid for this function returns different values for successive - invocations; there will be several entries with the same function, - all with this flag set - KVM_CPUID_FLAG_STATE_READ_NEXT: - for KVM_CPUID_FLAG_STATEFUL_FUNC entries, set if this entry is - the first entry to be read by a cpu eax, ebx, ecx, edx: |