KVM: VMX: Use current CPU's info to perform "disabled by BIOS?" checks

KVM: VMX: Use current CPU's info to perform "disabled by BIOS?" checks

Use this_cpu_has() instead of boot_cpu_has() to perform the effective
"disabled by BIOS?" checks for VMX.  This will allow consolidating code
between vmx_disabled_by_bios() and vmx_check_processor_compat().

Checking the boot CPU isn't a strict requirement as any divergence in VMX
enabling between the boot CPU and other CPUs will result in KVM refusing
to load thanks to the aforementioned vmx_check_processor_compat().

Furthermore, using the boot CPU was an unintentional change introduced by
commit a4d0b2fdbcf7 ("KVM: VMX: Use VMX feature flag to query BIOS
enabling").  Prior to using the feature flags, KVM checked the raw MSR
value from the current CPU.

Reported-by: Kai Huang <kai.huang@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Message-Id: <20221130230934.1014142-36-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>