diff options
author | Sean Christopherson <sean.j.christopherson@intel.com> | 2020-03-04 17:34:32 -0800 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-03-16 17:58:47 +0100 |
commit | 15608ed03f10a1414188612b0ee9653e3c78bbd9 (patch) | |
tree | ac09dad5dac942f2aece0e77a244c33326bdf0a8 /arch/x86/kvm/cpuid.c | |
parent | b7fb8488c85f2b5304e90d954a54d980adde60a4 (diff) |
KVM: x86: Add helpers to perform CPUID-based guest vendor check
Add helpers to provide CPUID-based guest vendor checks, i.e. to do the
ugly register comparisons. Use the new helpers to check for an AMD
guest vendor in guest_cpuid_is_amd() as well as in the existing emulator
flows.
Using the new helpers fixes a _very_ theoretical bug where
guest_cpuid_is_amd() would get a false positive on a non-AMD virtual CPU
with a vendor string beginning with "Auth" due to the previous logic
only checking EBX. It also fixes a marginally less theoretically bug
where guest_cpuid_is_amd() would incorrectly return false for a guest
CPU with "AMDisbetter!" as its vendor string.
Fixes: a0c0feb57992c ("KVM: x86: reserve bit 8 of non-leaf PDPEs and PML4Es in 64-bit mode on AMD")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
0 files changed, 0 insertions, 0 deletions