-
由 Sean Christopherson 提交于
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: a0c0feb5 ("KVM: x86: reserve bit 8 of non-leaf PDPEs and PML4Es in 64-bit mode on AMD") Signed-off-by: NSean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
15608ed0