x86/cpuid: Infrastructure for leaf 7:1.ebx

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
(cherry picked from commit e1828e3032)

tools/misc/xen-cpuid.c

@@ -193,6 +193,10 @@ static const char *const str_e21a[32] =
     [ 6] = "nscb",
 };
 
+static const char *const str_7b1[32] =
+{
+};
+
 static const struct {
     const char *name;
     const char *abbr;
@@ -211,6 +215,7 @@ static const struct {
     { "0x00000007:0.edx", "7d0", str_7d0 },
     { "0x00000007:1.eax", "7a1", str_7a1 },
     { "0x80000021.eax",  "e21a", str_e21a },
+    { "0x00000007:1.ebx", "7b1", str_7b1 },
 };
 
 #define COL_ALIGN "18"

xen/arch/x86/cpu/common.c

@@ -445,7 +445,8 @@ static void generic_identify(struct cpuinfo_x86 *c)
 		if (max_subleaf >= 1)
 			cpuid_count(7, 1,
 				    &c->x86_capability[FEATURESET_7a1],
-				    &tmp, &tmp, &tmp);
+				    &c->x86_capability[FEATURESET_7b1],
+				    &tmp, &tmp);
 	}
 
 	if (c->cpuid_level >= 0xd)

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

@@ -297,6 +297,8 @@ XEN_CPUFEATURE(FSRCS,        10*32+12) /*A  Fast Short REP CMPSB/SCASB */
 XEN_CPUFEATURE(LFENCE_DISPATCH,    11*32+ 2) /*A  LFENCE always serializing */
 XEN_CPUFEATURE(NSCB,               11*32+ 6) /*A  Null Selector Clears Base (and limit too) */
 
+/* Intel-defined CPU features, CPUID level 0x00000007:1.ebx, word 12 */
+
 #endif /* XEN_CPUFEATURE */
 
 /* Clean up from a default include.  Close the enum (for C). */

xen/include/xen/lib/x86/cpuid.h

@@ -16,6 +16,7 @@
 #define FEATURESET_7d0    9 /* 0x00000007:0.edx    */
 #define FEATURESET_7a1   10 /* 0x00000007:1.eax    */
 #define FEATURESET_e21a  11 /* 0x80000021.eax      */
+#define FEATURESET_7b1   12 /* 0x00000007:1.ebx    */
 
 struct cpuid_leaf
 {
@@ -188,6 +189,10 @@ struct cpuid_policy
                 uint32_t _7a1;
                 struct { DECL_BITFIELD(7a1); };
             };
+            union {
+                uint32_t _7b1;
+                struct { DECL_BITFIELD(7b1); };
+            };
         };
     } feat;
 
@@ -327,6 +332,7 @@ static inline void cpuid_policy_to_featureset(
     fs[FEATURESET_7d0] = p->feat._7d0;
     fs[FEATURESET_7a1] = p->feat._7a1;
     fs[FEATURESET_e21a] = p->extd.e21a;
+    fs[FEATURESET_7b1] = p->feat._7b1;
 }
 
 /* Fill in a CPUID policy from a featureset bitmap. */
@@ -345,6 +351,7 @@ static inline void cpuid_featureset_to_policy(
     p->feat._7d0  = fs[FEATURESET_7d0];
     p->feat._7a1  = fs[FEATURESET_7a1];
     p->extd.e21a  = fs[FEATURESET_e21a];
+    p->feat._7b1  = fs[FEATURESET_7b1];
 }
 
 static inline uint64_t cpuid_policy_xcr0_max(const struct cpuid_policy *p)