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i386/cpu: Make the Intel PT LIP feature configurable 

The current implementation will disable the guest Intel PT feature
if the Intel PT LIP feature is supported on the host, but the LIP
feature is comming soon(e.g. SnowRidge and later).

This patch will make the guest LIP feature configurable and Intel
PT feature can be enabled in guest when the guest LIP status same
with the host.

Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Message-Id: <20201202101042.11967-1-luwei.kang@intel.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Luwei Kang 2020-12-02 18:10:42 +08:00 committed by Eduardo Habkost
parent c7f7e6970d
commit d1615ea575
2 changed files with 34 additions and 1 deletions
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31
target/i386/cpu.c
View File

@ -672,6 +672,7 @@ static void x86_cpu_vendor_words2str(char *dst, uint32_t vendor1,
#define TCG_XSAVE_FEATURES (CPUID_XSAVE_XSAVEOPT | CPUID_XSAVE_XGETBV1)
/* missing:
CPUID_XSAVE_XSAVEC, CPUID_XSAVE_XSAVES */
#define TCG_14_0_ECX_FEATURES 0
typedef enum FeatureWordType {
CPUID_FEATURE_WORD,
@ -1301,6 +1302,26 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
}
},
[FEAT_14_0_ECX] = {
.type = CPUID_FEATURE_WORD,
.feat_names = {
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, "intel-pt-lip",
},
.cpuid = {
.eax = 0x14,
.needs_ecx = true, .ecx = 0,
.reg = R_ECX,
},
.tcg_features = TCG_14_0_ECX_FEATURES,
},
};
typedef struct FeatureMask {
@ -1373,6 +1394,10 @@ static FeatureDep feature_dependencies[] = {
.from = { FEAT_7_0_EBX, CPUID_7_0_EBX_RDSEED },
.to = { FEAT_VMX_SECONDARY_CTLS, VMX_SECONDARY_EXEC_RDSEED_EXITING },
},
{
.from = { FEAT_7_0_EBX, CPUID_7_0_EBX_INTEL_PT },
.to = { FEAT_14_0_ECX, ~0ull },
},
{
.from = { FEAT_8000_0001_EDX, CPUID_EXT2_RDTSCP },
.to = { FEAT_VMX_SECONDARY_CTLS, VMX_SECONDARY_EXEC_RDTSCP },
@ -5752,6 +5777,9 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*eax = INTEL_PT_MAX_SUBLEAF;
*ebx = INTEL_PT_MINIMAL_EBX;
*ecx = INTEL_PT_MINIMAL_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;
@ -6498,7 +6526,8 @@ static void x86_cpu_filter_features(X86CPU *cpu, bool verbose)
INTEL_PT_ADDR_RANGES_NUM) ||
((ebx_1 & (INTEL_PT_PSB_BITMAP | INTEL_PT_CYCLE_BITMAP)) !=
(INTEL_PT_PSB_BITMAP | INTEL_PT_CYCLE_BITMAP)) ||
(ecx_0 & INTEL_PT_IP_LIP)) {
((ecx_0 & CPUID_14_0_ECX_LIP) !=
(env->features[FEAT_14_0_ECX] & CPUID_14_0_ECX_LIP))) {
/*
* Processor Trace capabilities aren't configurable, so if the
* host can't emulate the capabilities we report on

4
target/i386/cpu.h
View File

@ -541,6 +541,7 @@ typedef enum FeatureWord {
FEAT_VMX_EPT_VPID_CAPS,
FEAT_VMX_BASIC,
FEAT_VMX_VMFUNC,
FEAT_14_0_ECX,
FEATURE_WORDS,
} FeatureWord;
@ -797,6 +798,9 @@ typedef uint64_t FeatureWordArray[FEATURE_WORDS];
/* AVX512 BFloat16 Instruction */
#define CPUID_7_1_EAX_AVX512_BF16 (1U << 5)
/* Packets which contain IP payload have LIP values */
#define CPUID_14_0_ECX_LIP (1U << 31)
/* CLZERO instruction */
#define CPUID_8000_0008_EBX_CLZERO (1U << 0)
/* Always save/restore FP error pointers */