On Fri, Apr 23, 2021 at 5:47 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > Do not allow an inexact CPUID "match" when querying the guest's CPUID.0x1 > to stuff EDX during INIT. In the common case, where the guest CPU model > is an AMD variant, allowing an inexact match is a nop since KVM doesn't > emulate Intel's goofy "out-of-range" logic for AMD and Hygon. If the > vCPU model happens to be an Intel variant, an inexact match is possible > if and only if the max CPUID leaf is precisely '0'. Aside from the fact > that there's probably no CPU in existence with a single CPUID leaf, if > the max CPUID leaf is '0', that means that CPUID.0.EAX is '0', and thus > an inexact match for CPUID.0x1.EAX will also yield '0'. > > So, with lots of twisty logic, no functional change intended. > > Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> Reviewed-by: Reiji Watanabe <reijiw@xxxxxxxxxx>
