Historically the Intel PT feature set reported from ICX silicon
was chosen as the fixed feature set for Intel PT. If want to enable
and expose INTEL-PT to guest, the supported Intel PT capabilities
reported by KVM must cover this fixed feature set, which are named
with MINIMAL in INTEL_PT_MINIMAL_EBX and INTEL_PT_MINIMAL_ECX.
However, the name is inaccurate that it's more proper as default than
minimal because SPR has less capabilities regarding CPUID(0x14,1):EBX[15:0].
Rename the feature set name to avoid future confusion and
opportunistically define each feature bit.
No functional change intended.
Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
target/i386/cpu.c | 70 ++++++++++++++++++++++-------------------------
target/i386/cpu.h | 34 ++++++++++++++++++++++-
2 files changed, 65 insertions(+), 39 deletions(-)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 03471efee66b..29dd79b16f6b 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -549,34 +549,29 @@ static CPUCacheInfo legacy_l3_cache = {
#define L2_ITLB_4K_ASSOC 4
#define L2_ITLB_4K_ENTRIES 512
-/* CPUID Leaf 0x14 constants: */
-#define INTEL_PT_MAX_SUBLEAF 0x1
-/*
- * bit[00]: IA32_RTIT_CTL.CR3 filter can be set to 1 and IA32_RTIT_CR3_MATCH
- * MSR can be accessed;
- * bit[01]: Support Configurable PSB and Cycle-Accurate Mode;
- * bit[02]: Support IP Filtering, TraceStop filtering, and preservation
- * of Intel PT MSRs across warm reset;
- * bit[03]: Support MTC timing packet and suppression of COFI-based packets;
- */
-#define INTEL_PT_MINIMAL_EBX 0xf
-/*
- * bit[00]: Tracing can be enabled with IA32_RTIT_CTL.ToPA = 1 and
- * IA32_RTIT_OUTPUT_BASE and IA32_RTIT_OUTPUT_MASK_PTRS MSRs can be
- * accessed;
- * bit[01]: ToPA tables can hold any number of output entries, up to the
- * maximum allowed by the MaskOrTableOffset field of
- * IA32_RTIT_OUTPUT_MASK_PTRS;
- * bit[02]: Support Single-Range Output scheme;
- */
-#define INTEL_PT_MINIMAL_ECX 0x7
-/* generated packets which contain IP payloads have LIP values */
-#define INTEL_PT_IP_LIP (1 << 31)
-#define INTEL_PT_ADDR_RANGES_NUM 0x2 /* Number of configurable address ranges */
-#define INTEL_PT_ADDR_RANGES_NUM_MASK 0x7
-#define INTEL_PT_MTC_BITMAP (0x0249 << 16) /* Support ART(0,3,6,9) */
-#define INTEL_PT_CYCLE_BITMAP 0x1fff /* Support 0,2^(0~11) */
-#define INTEL_PT_PSB_BITMAP (0x003f << 16) /* Support 2K,4K,8K,16K,32K,64K */
+/* INTEL PT definitions: */
+
+#define INTEL_PT_MAX_SUBLEAF 0x1
+
+#define INTEL_PT_ADDR_RANGES_NUM_MASK 0x7
+#define INTEL_PT_DEFAULT_ADDR_RANGES_NUM 0x2
+
+/* Support ART(0,3,6,9) */
+#define INTEL_PT_DEFAULT_MTC_BITMAP (0x0249 << 16)
+/* Support 0,2^(0~11) */
+#define INTEL_PT_DEFAULT_CYCLE_BITMAP 0x1fff
+/* Support 2K,4K,8K,16K,32K,64K */
+#define INTEL_PT_DEFAULT_PSB_BITMAP (0x003f << 16)
+
+#define INTEL_PT_DEFAULT_0_EBX (CPUID_14_0_EBX_CR3_FILTER | CPUID_14_0_EBX_PSB | \
+ CPUID_14_0_EBX_IP_FILTER | CPUID_14_0_EBX_MTC)
+
+#define INTEL_PT_DEFAULT_0_ECX (CPUID_14_0_ECX_TOPA | CPUID_14_0_ECX_MULTI_ENTRIES | \
+ CPUID_14_0_ECX_SINGLE_RANGE)
+
+#define INTEL_PT_DEFAULT_1_EAX (INTEL_PT_DEFAULT_MTC_BITMAP | INTEL_PT_DEFAULT_ADDR_RANGES_NUM)
+
+#define INTEL_PT_DEFAULT_1_EBX (INTEL_PT_DEFAULT_PSB_BITMAP | INTEL_PT_DEFAULT_CYCLE_BITMAP)
/* CPUID Leaf 0x1D constants: */
#define INTEL_AMX_TILE_MAX_SUBLEAF 0x1
@@ -6250,14 +6245,14 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
if (count == 0) {
*eax = INTEL_PT_MAX_SUBLEAF;
- *ebx = INTEL_PT_MINIMAL_EBX;
- *ecx = INTEL_PT_MINIMAL_ECX;
+ *ebx = INTEL_PT_DEFAULT_0_EBX;
+ *ecx = INTEL_PT_DEFAULT_0_ECX;
if (env->features[FEAT_14_0_ECX] & CPUID_14_0_ECX_LIP) {
*ecx |= CPUID_14_0_ECX_LIP;
}
} else if (count == 1) {
- *eax = INTEL_PT_MTC_BITMAP | INTEL_PT_ADDR_RANGES_NUM;
- *ebx = INTEL_PT_PSB_BITMAP | INTEL_PT_CYCLE_BITMAP;
+ *eax = INTEL_PT_DEFAULT_1_EAX;
+ *ebx = INTEL_PT_DEFAULT_1_EBX;
}
break;
}
@@ -7012,13 +7007,12 @@ static void x86_cpu_filter_features(X86CPU *cpu, bool verbose)
uint32_t ebx_1 = kvm_arch_get_supported_cpuid(s, 0x14, 1, R_EBX);
if (!eax_0 ||
- ((ebx_0 & INTEL_PT_MINIMAL_EBX) != INTEL_PT_MINIMAL_EBX) ||
- ((ecx_0 & INTEL_PT_MINIMAL_ECX) != INTEL_PT_MINIMAL_ECX) ||
- ((eax_1 & INTEL_PT_MTC_BITMAP) != INTEL_PT_MTC_BITMAP) ||
+ ((ebx_0 & INTEL_PT_DEFAULT_0_EBX) != INTEL_PT_DEFAULT_0_EBX) ||
+ ((ecx_0 & INTEL_PT_DEFAULT_0_ECX) != INTEL_PT_DEFAULT_0_ECX) ||
+ ((eax_1 & INTEL_PT_DEFAULT_MTC_BITMAP) != INTEL_PT_DEFAULT_MTC_BITMAP) ||
((eax_1 & INTEL_PT_ADDR_RANGES_NUM_MASK) <
- INTEL_PT_ADDR_RANGES_NUM) ||
- ((ebx_1 & (INTEL_PT_PSB_BITMAP | INTEL_PT_CYCLE_BITMAP)) !=
- (INTEL_PT_PSB_BITMAP | INTEL_PT_CYCLE_BITMAP)) ||
+ INTEL_PT_DEFAULT_ADDR_RANGES_NUM) ||
+ ((ebx_1 & INTEL_PT_DEFAULT_1_EBX) != INTEL_PT_DEFAULT_1_EBX) ||
((ecx_0 & CPUID_14_0_ECX_LIP) !=
(env->features[FEAT_14_0_ECX] & CPUID_14_0_ECX_LIP))) {
/*
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 500693eb9847..71b83102b75e 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -938,8 +938,40 @@ uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
/* XFD Extend Feature Disabled */
#define CPUID_D_1_EAX_XFD (1U << 4)
+/*
+ * IA32_RTIT_CTL.CR3 filter can be set to 1 and
+ * IA32_RTIT_CR3_MATCH can be accessed
+ */
+#define CPUID_14_0_EBX_CR3_FILTER (1U << 0)
+/* Support Configurable PSB and Cycle-Accurate Mode */
+#define CPUID_14_0_EBX_PSB (1U << 1)
+/*
+ * Support IP Filtering, IP TraceStop, and preservation
+ * of Intel PT MSRs across warm reset
+ */
+#define CPUID_14_0_EBX_IP_FILTER (1U << 2)
+/* Support MTC timing packet */
+#define CPUID_14_0_EBX_MTC (1U << 3)
+/* Support PTWRITE */
+#define CPUID_14_0_EBX_PTWRITE (1U << 4)
+/* Support Power Event Trace packet generation */
+#define CPUID_14_0_EBX_POWER_EVENT (1U << 5)
+/* Support PSB and PMI Preservation */
+#define CPUID_14_0_EBX_PSB_PMI_PRESERVATION (1U << 6)
+
+/* Tracing can be enabled with IA32_RTIT_CTL.ToPA = 1 */
+#define CPUID_14_0_ECX_TOPA (1U << 0)
+/*
+ * ToPA tables can hold any number of output entries, up to the maximum allowed
+ * by the MaskOrTableOffset field of IA32_RTIT_OUTPUT_MASK_PTRS
+ */
+#define CPUID_14_0_ECX_MULTI_ENTRIES (1U << 1)
+/* Support Single-Range Output scheme */
+#define CPUID_14_0_ECX_SINGLE_RANGE (1U << 2)
+/* Support IA32_RTIT_CTL.FabricEn */
+#define CPUID_14_0_ECX_TRACE_TRANS_SUBSYSTEM (1U << 3)
/* Packets which contain IP payload have LIP values */
-#define CPUID_14_0_ECX_LIP (1U << 31)
+#define CPUID_14_0_ECX_LIP (1U << 31)
/* CLZERO instruction */
#define CPUID_8000_0008_EBX_CLZERO (1U << 0)
--
2.34.1
