x86/cpufeatures: Assign dedicated feature word for CPUID_0x8000001F[EAX]

mainline inclusion
from mainline-v5.12
commit fb35d30f
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5S3WV


CVE: NA

-------------------------------------------------

Collect the scattered SME/SEV related feature flags into a dedicated
word.  There are now five recognized features in CPUID.0x8000001F.EAX,
with at least one more on the horizon (SEV-SNP).  Using a dedicated word
allows KVM to use its automagic CPUID adjustment logic when reporting
the set of supported features to userspace.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
Link: https://lkml.kernel.org/r/20210122204047.2860075-2-seanjc@google.com


Signed-off-by: Xie Haocheng <haocheng.xie@amd.com>