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[PATCH v2] x86/cpuid: enumerate and expose PREFETCHIT{0,1}
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 22 Nov 2023 08:43:06 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 22 Nov 2023 07:43:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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@xxxxxxxx>
---
v2: gen-cpuid adjustment.
--- a/tools/misc/xen-cpuid.c
+++ b/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",
};
--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -310,6 +310,7 @@ XEN_CPUFEATURE(AVX_VNNI_INT8, 15*32
/* 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 */
--- a/xen/tools/gen-cpuid.py
+++ b/xen/tools/gen-cpuid.py
@@ -274,7 +274,7 @@ def crunch_numbers(state):
# superpages, PCID and PKU are only available in 4 level paging.
# NO_LMSL indicates the absense of Long Mode Segment Limits, which
# have been dropped in hardware.
- LM: [CX16, PCID, LAHF_LM, PAGE1GB, PKU, NO_LMSL],
+ LM: [CX16, PCID, LAHF_LM, PAGE1GB, PKU, NO_LMSL, PREFETCHI],
# AMD K6-2+ and K6-III processors shipped with 3DNow+, beyond the
# standard 3DNow in the earlier K6 processors.
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