[PATCH v9 6/9] x86emul: support X{SUS,RES}LDTRK

[Jan Beulich <jbeulich@xxxxxxxx>]

There's nothing to be done by the emulator, as we unconditionally abort
any XBEGIN.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
v9: A -> a in public header. Add comments.
v6: New.

--- a/tools/libxl/libxl_cpuid.c
+++ b/tools/libxl/libxl_cpuid.c
@@ -208,6 +208,7 @@ int libxl_cpuid_parse_config(libxl_cpuid
         {"avx512-vnni",  0x00000007,  0, CPUID_REG_ECX, 11,  1},
         {"avx512-bitalg",0x00000007,  0, CPUID_REG_ECX, 12,  1},
         {"avx512-vpopcntdq",0x00000007,0,CPUID_REG_ECX, 14,  1},
+        {"tsxldtrk",     0x00000007,  0, CPUID_REG_ECX, 16,  1},
         {"rdpid",        0x00000007,  0, CPUID_REG_ECX, 22,  1},
         {"cldemote",     0x00000007,  0, CPUID_REG_ECX, 25,  1},
 
--- a/tools/misc/xen-cpuid.c
+++ b/tools/misc/xen-cpuid.c
@@ -128,6 +128,7 @@ static const char *const str_7c0[32] =
     [10] = "vpclmulqdq",       [11] = "avx512_vnni",
     [12] = "avx512_bitalg",
     [14] = "avx512_vpopcntdq",
+    [16] = "tsxldtrk",
 
     [22] = "rdpid",
     /* 24 */                   [25] = "cldemote",
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -1921,6 +1921,7 @@ amd_like(const struct x86_emulate_ctxt *
 #define vcpu_has_avx512_vnni() (ctxt->cpuid->feat.avx512_vnni)
 #define vcpu_has_avx512_bitalg() (ctxt->cpuid->feat.avx512_bitalg)
 #define vcpu_has_avx512_vpopcntdq() (ctxt->cpuid->feat.avx512_vpopcntdq)
+#define vcpu_has_tsxldtrk()    (ctxt->cpuid->feat.tsxldtrk)
 #define vcpu_has_rdpid()       (ctxt->cpuid->feat.rdpid)
 #define vcpu_has_movdiri()     (ctxt->cpuid->feat.movdiri)
 #define vcpu_has_movdir64b()   (ctxt->cpuid->feat.movdir64b)
@@ -5668,6 +5669,28 @@ x86_emulate(
                 host_and_vcpu_must_have(serialize);
                 asm volatile ( ".byte 0x0f, 0x01, 0xe8" );
                 break;
+            case vex_f2: /* xsusldtrk */
+                vcpu_must_have(tsxldtrk);
+                /*
+                 * We're never in a transactional region when coming here
+                 * - nothing else to do.
+                 */
+                break;
+            default:
+                goto unimplemented_insn;
+            }
+            break;
+
+        case 0xe9:
+            switch ( vex.pfx )
+            {
+            case vex_f2: /* xresldtrk */
+                vcpu_must_have(tsxldtrk);
+                /*
+                 * We're never in a transactional region when coming here
+                 * - nothing else to do.
+                 */
+                break;
             default:
                 goto unimplemented_insn;
             }
--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -238,6 +238,7 @@ XEN_CPUFEATURE(VPCLMULQDQ,    6*32+10) /
 XEN_CPUFEATURE(AVX512_VNNI,   6*32+11) /*A  Vector Neural Network Instrs */
 XEN_CPUFEATURE(AVX512_BITALG, 6*32+12) /*A  Support for VPOPCNT[B,W] and 
VPSHUFBITQMB */
 XEN_CPUFEATURE(AVX512_VPOPCNTDQ, 6*32+14) /*A  POPCNT for vectors of DW/QW */
+XEN_CPUFEATURE(TSXLDTRK,      6*32+16) /*a  TSX load tracking suspend/resume 
insns */
 XEN_CPUFEATURE(RDPID,         6*32+22) /*A  RDPID instruction */
 XEN_CPUFEATURE(CLDEMOTE,      6*32+25) /*A  CLDEMOTE instruction */
 XEN_CPUFEATURE(MOVDIRI,       6*32+27) /*A  MOVDIRI instruction */
--- a/xen/tools/gen-cpuid.py
+++ b/xen/tools/gen-cpuid.py
@@ -289,6 +289,9 @@ def crunch_numbers(state):
         # as dependent features simplifies Xen's logic, and prevents the guest
         # from seeing implausible configurations.
         IBRSB: [STIBP, SSBD],
+
+        # In principle the TSXLDTRK insns could also be considered independent.
+        RTM: [TSXLDTRK],
     }
 
     deep_features = tuple(sorted(deps.keys()))