target/i386: Enable TSX Suspend Load Address Tracking feature

This instruction aims to give a way to choose which memory accesses
do not need to be tracked in the TSX read set, which is defined as
CPUID.(EAX=7,ECX=0):EDX[bit 16].

The release spec link is as follows:
https://software.intel.com/content/dam/develop/public/us/en/documents/\
architecture-instruction-set-extensions-programming-reference.pdf

The associated kvm patch link is as follows:
https://lore.kernel.org/patchwork/patch/1268026/

Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
Message-Id: <1593991036-12183-3-git-send-email-cathy.zhang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index a05d3a641bb30836a1cb1d34917179dea03ef0e1..1e5123251d74ec9ab8146844b80cd00d0b6cff7e 100644 (file)
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -987,7 +987,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
             NULL, NULL, NULL, NULL,
             "avx512-vp2intersect", NULL, "md-clear", NULL,
             NULL, NULL, "serialize", NULL,
-            NULL, NULL, NULL /* pconfig */, NULL,
+            "tsx-ldtrk", NULL, NULL /* pconfig */, NULL,
             NULL, NULL, NULL, NULL,
             NULL, NULL, "spec-ctrl", "stibp",
             NULL, "arch-capabilities", "core-capability", "ssbd",

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index bd71fe3ef23143cce66f7936cb3ff3a45e204f53..37fffa5cac80e92193753e25f76e168e117f9e22 100644 (file)
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -779,6 +779,8 @@ typedef uint64_t FeatureWordArray[FEATURE_WORDS];
 #define CPUID_7_0_EDX_AVX512_VP2INTERSECT (1U << 8)
 /* SERIALIZE instruction */
 #define CPUID_7_0_EDX_SERIALIZE         (1U << 14)
+/* TSX Suspend Load Address Tracking instruction */
+#define CPUID_7_0_EDX_TSX_LDTRK         (1U << 16)
 /* Speculation Control */
 #define CPUID_7_0_EDX_SPEC_CTRL         (1U << 26)
 /* Single Thread Indirect Branch Predictors */