diff options
| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2020-03-03 02:56:41 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-03-16 19:58:23 +0300 |
| commit | 66a6950f99950c77e2898e48d668eca1dac10a1e (patch) | |
| tree | 94cb49d0d7310f8e702aa659ce086e5876be4e2f /arch/x86/kvm/svm.c | |
| parent | 9e6d01c2d9088efb8326997cafa8580295a49435 (diff) | |
| download | linux-66a6950f99950c77e2898e48d668eca1dac10a1e.tar.xz | |
KVM: x86: Introduce kvm_cpu_caps to replace runtime CPUID masking
Calculate the CPUID masks for KVM_GET_SUPPORTED_CPUID at load time using
what is effectively a KVM-adjusted copy of boot_cpu_data, or more
precisely, the x86_capability array in boot_cpu_data.
In terms of KVM support, the vast majority of CPUID feature bits are
constant, and *all* feature support is known at KVM load time. Rather
than apply boot_cpu_data, which is effectively read-only after init,
at runtime, copy it into a KVM-specific array and use *that* to mask
CPUID registers.
In additional to consolidating the masking, kvm_cpu_caps can be adjusted
by SVM/VMX at load time and thus eliminate all feature bit manipulation
in ->set_supported_cpuid().
Opportunistically clean up a few warts:
- Replace bare "unsigned" with "unsigned int" when a feature flag is
captured in a local variable, e.g. f_nx.
- Sort the CPUID masks by function, index and register (alphabetically
for registers, i.e. EBX comes before ECX/EDX).
- Remove the superfluous /* cpuid 7.0.ecx */ comments.
No functional change intended.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
[Call kvm_set_cpu_caps from kvm_x86_ops->hardware_setup due to fixed
GBPAGES patch. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 8984ae140689..aae5e3eff48d 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1479,6 +1479,8 @@ static __init int svm_hardware_setup(void) pr_info("Virtual GIF supported\n"); } + kvm_set_cpu_caps(); + return 0; err: |