[xen master] x86/CPUID: add further "fast repeated string ops" feature flags

[patchbot@xxxxxxx]

commit a8c532be6a44c7faa54ac777a717f4aa65e3a806
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Apr 19 15:29:39 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Apr 19 15:29:39 2021 +0200

    x86/CPUID: add further "fast repeated string ops" feature flags
    
    Like ERMS this can always be exposed to guests, but I guess once we
    introduce full validation we want to make sure we don't reject incoming
    policies with any of these set when in the raw/host policies they're
    clear.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 tools/libs/light/libxl_cpuid.c              | 4 ++++
 tools/misc/xen-cpuid.c                      | 3 +++
 xen/include/public/arch-x86/cpufeatureset.h | 4 ++++
 3 files changed, 11 insertions(+)

diff --git a/tools/libs/light/libxl_cpuid.c b/tools/libs/light/libxl_cpuid.c
index aee28b0430..943a343239 100644
--- a/tools/libs/light/libxl_cpuid.c
+++ b/tools/libs/light/libxl_cpuid.c
@@ -215,6 +215,7 @@ int libxl_cpuid_parse_config(libxl_cpuid_policy_list 
*cpuid, const char* str)
 
         {"avx512-4vnniw",0x00000007,  0, CPUID_REG_EDX,  2,  1},
         {"avx512-4fmaps",0x00000007,  0, CPUID_REG_EDX,  3,  1},
+        {"fsrm",         0x00000007,  0, CPUID_REG_EDX,  4,  1},
         {"avx512-vp2intersect",0x00000007,0,CPUID_REG_EDX,8, 1},
         {"srbds-ctrl",   0x00000007,  0, CPUID_REG_EDX,  9,  1},
         {"md-clear",     0x00000007,  0, CPUID_REG_EDX, 10,  1},
@@ -229,6 +230,9 @@ int libxl_cpuid_parse_config(libxl_cpuid_policy_list 
*cpuid, const char* str)
 
         {"avx-vnni",     0x00000007,  1, CPUID_REG_EAX,  4,  1},
         {"avx512-bf16",  0x00000007,  1, CPUID_REG_EAX,  5,  1},
+        {"fzrm",         0x00000007,  1, CPUID_REG_EAX, 10,  1},
+        {"fsrs",         0x00000007,  1, CPUID_REG_EAX, 11,  1},
+        {"fsrcs",        0x00000007,  1, CPUID_REG_EAX, 12,  1},
 
         {"lahfsahf",     0x80000001, NA, CPUID_REG_ECX,  0,  1},
         {"cmplegacy",    0x80000001, NA, CPUID_REG_ECX,  1,  1},
diff --git a/tools/misc/xen-cpuid.c b/tools/misc/xen-cpuid.c
index 628e8f5aa2..b4229d1126 100644
--- a/tools/misc/xen-cpuid.c
+++ b/tools/misc/xen-cpuid.c
@@ -177,6 +177,9 @@ static const char *const str_7d0[32] =
 static const char *const str_7a1[32] =
 {
     [ 4] = "avx-vnni",      [ 5] = "avx512-bf16",
+
+    [10] = "fzrm",          [11] = "fsrs",
+    [12] = "fsrcs",
 };
 
 static const struct {
diff --git a/xen/include/public/arch-x86/cpufeatureset.h 
b/xen/include/public/arch-x86/cpufeatureset.h
index 42bc8d4279..7cdd08d551 100644
--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -261,6 +261,7 @@ XEN_CPUFEATURE(AMD_PPIN,      8*32+23) /*   Protected 
Processor Inventory Number
 /* Intel-defined CPU features, CPUID level 0x00000007:0.edx, word 9 */
 XEN_CPUFEATURE(AVX512_4VNNIW, 9*32+ 2) /*A  AVX512 Neural Network Instructions 
*/
 XEN_CPUFEATURE(AVX512_4FMAPS, 9*32+ 3) /*A  AVX512 Multiply Accumulation 
Single Precision */
+XEN_CPUFEATURE(FSRM,          9*32+ 4) /*A  Fast Short REP MOVS */
 XEN_CPUFEATURE(AVX512_VP2INTERSECT, 9*32+8) /*a  VP2INTERSECT{D,Q} insns */
 XEN_CPUFEATURE(SRBDS_CTRL,    9*32+ 9) /*   MSR_MCU_OPT_CTRL and 
RNGDS_MITG_DIS. */
 XEN_CPUFEATURE(MD_CLEAR,      9*32+10) /*A  VERW clears microarchitectural 
buffers */
@@ -277,6 +278,9 @@ XEN_CPUFEATURE(SSBD,          9*32+31) /*A  
MSR_SPEC_CTRL.SSBD available */
 /* Intel-defined CPU features, CPUID level 0x00000007:1.eax, word 10 */
 XEN_CPUFEATURE(AVX_VNNI,     10*32+ 4) /*A  AVX-VNNI Instructions */
 XEN_CPUFEATURE(AVX512_BF16,  10*32+ 5) /*A  AVX512 BFloat16 Instructions */
+XEN_CPUFEATURE(FZRM,         10*32+10) /*A  Fast Zero-length REP MOVSB */
+XEN_CPUFEATURE(FSRS,         10*32+11) /*A  Fast Short REP STOSB */
+XEN_CPUFEATURE(FSRCS,        10*32+12) /*A  Fast Short REP CMPSB/SCASB */
 
 #endif /* XEN_CPUFEATURE */
 
--
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