x86/cpuid: enumerate and expose PREFETCHIT{0,1}

There's nothing else that should need doing in order for guests to be
able to use these insns, as the encodings are in what's otherwise NOP
space.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

tools/misc/xen-cpuid.c

@@ -220,6 +220,8 @@ static const char *const str_7d1[32] =
 {
     [ 4] = "avx-vnni-int8",       [ 5] = "avx-ne-convert",
 
+    [14] = "prefetchi",
+
     [18] = "cet-sss",
 };
 

xen/include/public/arch-x86/cpufeatureset.h

@@ -310,6 +310,7 @@ XEN_CPUFEATURE(MCDT_NO,            13*32+ 5) /*A  MCDT_NO */
 /* Intel-defined CPU features, CPUID level 0x00000007:1.edx, word 15 */
 XEN_CPUFEATURE(AVX_VNNI_INT8,      15*32+ 4) /*A  AVX-VNNI-INT8 Instructions */
 XEN_CPUFEATURE(AVX_NE_CONVERT,     15*32+ 5) /*A  AVX-NE-CONVERT Instructions */
+XEN_CPUFEATURE(PREFETCHI,          15*32+14) /*A  PREFETCHIT{0,1} Instructions */
 XEN_CPUFEATURE(CET_SSS,            15*32+18) /*   CET Supervisor Shadow Stacks safe to use */
 
 /* Intel-defined CPU features, MSR_ARCH_CAPS 0x10a.eax, word 16 */