Currently, CPUID.(EAX=0DH,ECX=01H) doesn't enumerate features in
XSS properly, add the support here. XCR0 bits indicate user-mode XSAVE
components, and XSS bits indicate supervisor-mode XSAVE components.
Signed-off-by: Yang Weijiang <weijiang.y...@intel.com>
---
target/i386/cpu.c | 48 ++++++++++++++++++++++++++++++++++++++++++-----
target/i386/cpu.h | 12 ++++++++++++
2 files changed, 55 insertions(+), 5 deletions(-)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index e2891740f1..38eab02b3d 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1069,6 +1069,24 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS]
= {
},
.tcg_features = TCG_XSAVE_FEATURES,
},
+ [FEAT_XSAVE_XSS_LO] = {
+ .type = CPUID_FEATURE_WORD,
+ .cpuid = {
+ .eax = 0xD,
+ .needs_ecx = true,
+ .ecx = 1,
+ .reg = R_ECX,
+ },
+ },
+ [FEAT_XSAVE_XSS_HI] = {
+ .type = CPUID_FEATURE_WORD,
+ .cpuid = {
+ .eax = 0xD,
+ .needs_ecx = true,
+ .ecx = 1,
+ .reg = R_EDX
+ },
+ },
[FEAT_6_EAX] = {
.type = CPUID_FEATURE_WORD,
.feat_names = {
@@ -1489,6 +1507,9 @@ static uint32_t xsave_area_size(uint64_t mask)
for (i = 0; i < ARRAY_SIZE(x86_ext_save_areas); i++) {
const ExtSaveArea *esa = &x86_ext_save_areas[i];
if ((mask >> i) & 1) {
+ if (i >= 2 && !esa->offset) {
+ continue;
+ }
ret = MAX(ret, esa->offset + esa->size);
}
}
@@ -1500,12 +1521,18 @@ static inline bool accel_uses_host_cpuid(void)
return kvm_enabled() || hvf_enabled();
}
-static inline uint64_t x86_cpu_xsave_components(X86CPU *cpu)
+static inline uint64_t x86_cpu_xsave_xcr0_components(X86CPU *cpu)
{
return ((uint64_t)cpu->env.features[FEAT_XSAVE_XCR0_HI]) << 32 |
cpu->env.features[FEAT_XSAVE_XCR0_LO];
}
+static inline uint64_t x86_cpu_xsave_xss_components(X86CPU *cpu)
+{
+ return ((uint64_t)cpu->env.features[FEAT_XSAVE_XSS_HI]) << 32 |
+ cpu->env.features[FEAT_XSAVE_XSS_LO];
+}
+
const char *get_register_name_32(unsigned int reg)
{
if (reg >= CPU_NB_REGS32) {
@@ -5735,7 +5762,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
uint32_t count,
}
if (count == 0) {
- *ecx = xsave_area_size(x86_cpu_xsave_components(cpu));
+ *ecx = xsave_area_size(x86_cpu_xsave_xcr0_components(cpu));
*eax = env->features[FEAT_XSAVE_XCR0_LO];
*edx = env->features[FEAT_XSAVE_XCR0_HI];
/*
@@ -5747,11 +5774,17 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
uint32_t count,
*ebx = kvm_enabled() ? *ecx : xsave_area_size(env->xcr0);
} else if (count == 1) {
*eax = env->features[FEAT_XSAVE_INSTRUCTION];
+ *ecx = env->features[FEAT_XSAVE_XSS_LO];
+ *edx = env->features[FEAT_XSAVE_XSS_HI];
} else if (count < ARRAY_SIZE(x86_ext_save_areas)) {
- if ((x86_cpu_xsave_components(cpu) >> count) & 1) {
- const ExtSaveArea *esa = &x86_ext_save_areas[count];
+ const ExtSaveArea *esa = &x86_ext_save_areas[count];
+ if ((x86_cpu_xsave_xcr0_components(cpu) >> count) & 1) {
*eax = esa->size;
*ebx = esa->offset;
+ } else if ((x86_cpu_xsave_xss_components(cpu) >> count) & 1) {
+ *eax = esa->size;
+ *ebx = 0;
+ *ecx = 1;
}
}
break;
@@ -6073,6 +6106,9 @@ static void x86_cpu_reset(DeviceState *dev)
}
for (i = 2; i < ARRAY_SIZE(x86_ext_save_areas); i++) {
const ExtSaveArea *esa = &x86_ext_save_areas[i];
+ if (!esa->offset) {
+ continue;
+ }
if (env->features[esa->feature] & esa->bits) {
xcr0 |= 1ull << i;
}
@@ -6307,8 +6343,10 @@ static void x86_cpu_enable_xsave_components(X86CPU *cpu)
}
}
- env->features[FEAT_XSAVE_XCR0_LO] = mask;
+ env->features[FEAT_XSAVE_XCR0_LO] = mask & CPUID_XSTATE_XCR0_MASK;
env->features[FEAT_XSAVE_XCR0_HI] = mask >> 32;
+ env->features[FEAT_XSAVE_XSS_LO] = mask & CPUID_XSTATE_XSS_MASK;
+ env->features[FEAT_XSAVE_XSS_HI] = mask >> 32;
}
/***** Steps involved on loading and filtering CPUID data
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index b86eb8dba0..10bf4d8b51 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -504,6 +504,16 @@ typedef enum X86Seg {
#define XSTATE_Hi16_ZMM_MASK (1ULL << XSTATE_Hi16_ZMM_BIT)
#define XSTATE_PKRU_MASK (1ULL << XSTATE_PKRU_BIT)
+/* CPUID feature bits available in XCR0 */
+#define CPUID_XSTATE_XCR0_MASK (XSTATE_FP_MASK | XSTATE_SSE_MASK | \
+ XSTATE_YMM_MASK | XSTATE_BNDREGS_MASK | \
+ XSTATE_BNDCSR_MASK | XSTATE_OPMASK_MASK | \
+ XSTATE_ZMM_Hi256_MASK | \
+ XSTATE_Hi16_ZMM_MASK | XSTATE_PKRU_MASK)
+
+/* CPUID feature bits available in XSS */
+#define CPUID_XSTATE_XSS_MASK 0
+
/* CPUID feature words */
typedef enum FeatureWord {
FEAT_1_EDX, /* CPUID[1].EDX */
@@ -541,6 +551,8 @@ typedef enum FeatureWord {
FEAT_VMX_EPT_VPID_CAPS,
FEAT_VMX_BASIC,
FEAT_VMX_VMFUNC,
+ FEAT_XSAVE_XSS_LO, /* CPUID[EAX=0xd,ECX=1].ECX */
+ FEAT_XSAVE_XSS_HI, /* CPUID[EAX=0xd,ECX=1].EDX */
FEATURE_WORDS,
} FeatureWord;
--
2.26.2
