[xen staging] x86emul: support SERIALIZE

[patchbot@xxxxxxx]

commit cca6bf0730ec206afe7ca0536e38ed52ef2dc818
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri May 15 16:09:22 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri May 15 16:09:22 2020 +0200

    x86emul: support SERIALIZE
    
    ... enabling its use by all guest kinds at the same time.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 tools/libxl/libxl_cpuid.c                   |  1 +
 tools/misc/xen-cpuid.c                      |  1 +
 tools/tests/x86_emulator/x86-emulate.h      |  1 +
 xen/arch/x86/x86_emulate/x86_emulate.c      | 13 +++++++++++++
 xen/include/asm-x86/cpufeature.h            |  1 +
 xen/include/public/arch-x86/cpufeatureset.h |  1 +
 6 files changed, 18 insertions(+)

diff --git a/tools/libxl/libxl_cpuid.c b/tools/libxl/libxl_cpuid.c
index 00262a3f8f..3ed4a074a4 100644
--- a/tools/libxl/libxl_cpuid.c
+++ b/tools/libxl/libxl_cpuid.c
@@ -214,6 +214,7 @@ 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},
         {"md-clear",     0x00000007,  0, CPUID_REG_EDX, 10,  1},
+        {"serialize",    0x00000007,  0, CPUID_REG_EDX, 14,  1},
         {"cet-ibt",      0x00000007,  0, CPUID_REG_EDX, 20,  1},
         {"ibrsb",        0x00000007,  0, CPUID_REG_EDX, 26,  1},
         {"stibp",        0x00000007,  0, CPUID_REG_EDX, 27,  1},
diff --git a/tools/misc/xen-cpuid.c b/tools/misc/xen-cpuid.c
index ff36d8cee1..6557a65d55 100644
--- a/tools/misc/xen-cpuid.c
+++ b/tools/misc/xen-cpuid.c
@@ -161,6 +161,7 @@ static const char *const str_7d0[32] =
 
     [10] = "md-clear",
     /* 12 */                [13] = "tsx-force-abort",
+    [14] = "serialize",
 
     [18] = "pconfig",
     [20] = "cet-ibt",
diff --git a/tools/tests/x86_emulator/x86-emulate.h 
b/tools/tests/x86_emulator/x86-emulate.h
index 510850200a..dfb0a19394 100644
--- a/tools/tests/x86_emulator/x86-emulate.h
+++ b/tools/tests/x86_emulator/x86-emulate.h
@@ -156,6 +156,7 @@ static inline bool xcr0_mask(uint64_t mask)
 #define cpu_has_avx512_vpopcntdq (cp.feat.avx512_vpopcntdq && xcr0_mask(0xe6))
 #define cpu_has_avx512_4vnniw (cp.feat.avx512_4vnniw && xcr0_mask(0xe6))
 #define cpu_has_avx512_4fmaps (cp.feat.avx512_4fmaps && xcr0_mask(0xe6))
+#define cpu_has_serialize  cp.feat.serialize
 #define cpu_has_avx512_bf16 (cp.feat.avx512_bf16 && xcr0_mask(0xe6))
 
 #define cpu_has_xgetbv1   (cpu_has_xsave && cp.xstate.xgetbv1)
diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c 
b/xen/arch/x86/x86_emulate/x86_emulate.c
index 7503da980f..4f5856251c 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -1916,6 +1916,7 @@ amd_like(const struct x86_emulate_ctxt *ctxt)
 #define vcpu_has_rdpid()       (ctxt->cpuid->feat.rdpid)
 #define vcpu_has_avx512_4vnniw() (ctxt->cpuid->feat.avx512_4vnniw)
 #define vcpu_has_avx512_4fmaps() (ctxt->cpuid->feat.avx512_4fmaps)
+#define vcpu_has_serialize()   (ctxt->cpuid->feat.serialize)
 #define vcpu_has_avx512_bf16() (ctxt->cpuid->feat.avx512_bf16)
 
 #define vcpu_must_have(feat) \
@@ -5639,6 +5640,18 @@ x86_emulate(
                 goto done;
             break;
 
+        case 0xe8:
+            switch ( vex.pfx )
+            {
+            case vex_none: /* serialize */
+                host_and_vcpu_must_have(serialize);
+                asm volatile ( ".byte 0x0f, 0x01, 0xe8" );
+                break;
+            default:
+                goto unimplemented_insn;
+            }
+            break;
+
         case 0xf8: /* swapgs */
             generate_exception_if(!mode_64bit(), EXC_UD);
             generate_exception_if(!mode_ring0(), EXC_GP, 0);
diff --git a/xen/include/asm-x86/cpufeature.h b/xen/include/asm-x86/cpufeature.h
index 859970570b..cadef4e824 100644
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -126,6 +126,7 @@
 #define cpu_has_avx512_4vnniw   boot_cpu_has(X86_FEATURE_AVX512_4VNNIW)
 #define cpu_has_avx512_4fmaps   boot_cpu_has(X86_FEATURE_AVX512_4FMAPS)
 #define cpu_has_tsx_force_abort boot_cpu_has(X86_FEATURE_TSX_FORCE_ABORT)
+#define cpu_has_serialize       boot_cpu_has(X86_FEATURE_SERIALIZE)
 
 /* CPUID level 0x00000007:1.eax */
 #define cpu_has_avx512_bf16     boot_cpu_has(X86_FEATURE_AVX512_BF16)
diff --git a/xen/include/public/arch-x86/cpufeatureset.h 
b/xen/include/public/arch-x86/cpufeatureset.h
index 0ffab6c57b..cba7b0da3d 100644
--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -257,6 +257,7 @@ 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(MD_CLEAR,      9*32+10) /*A  VERW clears microarchitectural 
buffers */
 XEN_CPUFEATURE(TSX_FORCE_ABORT, 9*32+13) /* MSR_TSX_FORCE_ABORT.RTM_ABORT */
+XEN_CPUFEATURE(SERIALIZE,     9*32+14) /*a  SERIALIZE insn */
 XEN_CPUFEATURE(CET_IBT,       9*32+20) /*   CET - Indirect Branch Tracking */
 XEN_CPUFEATURE(IBRSB,         9*32+26) /*A  IBRS and IBPB support (used by 
Intel) */
 XEN_CPUFEATURE(STIBP,         9*32+27) /*A  STIBP */
--
generated by git-patchbot for /home/xen/git/xen.git#staging