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| author | Jiaxi Chen <jiaxi.chen@linux.intel.com> | 2022-11-25 20:58:45 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-11-28 13:33:30 -0500 |
| commit | 29c46979b25d5ca867e9859bfdd088d028739cdf (patch) | |
| tree | 5058c82c12f5eb7c248b7e656948e539a20abcf2 /virt | |
| parent | 9977f0877de7f8fc51391e2d52bc993efbd58b90 (diff) | |
| download | linux-29c46979b25d5ca867e9859bfdd088d028739cdf.tar.bz2 | |
KVM: x86: Advertise PREFETCHIT0/1 CPUID to user space
Latest Intel platform Granite Rapids has introduced a new instruction -
PREFETCHIT0/1, which moves code to memory (cache) closer to the
processor depending on specific hints.
The bit definition:
CPUID.(EAX=7,ECX=1):EDX[bit 14]
PREFETCHIT0/1 is on a KVM-only subleaf. Plus an x86_FEATURE definition
for this feature bit to direct it to the KVM entry.
Advertise PREFETCHIT0/1 to KVM userspace. This is safe because there are
no new VMX controls or additional host enabling required for guests to
use this feature.
Signed-off-by: Jiaxi Chen <jiaxi.chen@linux.intel.com>
Message-Id: <20221125125845.1182922-9-jiaxi.chen@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions