Add cpuid bit definition for the SUCCOR feature. This cpuid bit is required to
be exposed to guests to allow them to handle machine check exceptions on AMD
hosts.
Reported-by: William Roche <william.ro...@oracle.com>
Reviewed-by: Joao Martins <joao.m.mart...@oracle.com>
Signed-off-by: John Allen <john.al...@amd.com>
----
v2:
- Add "succor" feature word.
- Add case to kvm_arch_get_supported_cpuid for the SUCCOR feature.
---
target/i386/cpu.c | 18 +++++++++++++++++-
target/i386/cpu.h | 4 ++++
target/i386/kvm/kvm.c | 2 ++
3 files changed, 23 insertions(+), 1 deletion(-)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 00f913b638..d90d3a9489 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1029,6 +1029,22 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
.tcg_features = TCG_APM_FEATURES,
.unmigratable_flags = CPUID_APM_INVTSC,
},
+ [FEAT_8000_0007_EBX] = {
+ .type = CPUID_FEATURE_WORD,
+ .feat_names = {
+ NULL, "succor", 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,
+ },
+ .cpuid = { .eax = 0x80000007, .reg = R_EBX, },
+ .tcg_features = 0,
+ .unmigratable_flags = 0,
+ },
[FEAT_8000_0008_EBX] = {
.type = CPUID_FEATURE_WORD,
.feat_names = {
@@ -6554,7 +6570,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
uint32_t count,
break;
case 0x80000007:
*eax = 0;
- *ebx = 0;
+ *ebx = env->features[FEAT_8000_0007_EBX];
*ecx = 0;
*edx = env->features[FEAT_8000_0007_EDX];
break;
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index a6000e93bd..f5afc5e4fd 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -598,6 +598,7 @@ typedef enum FeatureWord {
FEAT_7_1_EAX, /* CPUID[EAX=7,ECX=1].EAX */
FEAT_8000_0001_EDX, /* CPUID[8000_0001].EDX */
FEAT_8000_0001_ECX, /* CPUID[8000_0001].ECX */
+ FEAT_8000_0007_EBX, /* CPUID[8000_0007].EBX */
FEAT_8000_0007_EDX, /* CPUID[8000_0007].EDX */
FEAT_8000_0008_EBX, /* CPUID[8000_0008].EBX */
FEAT_8000_0021_EAX, /* CPUID[8000_0021].EAX */
@@ -942,6 +943,9 @@ uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
/* Packets which contain IP payload have LIP values */
#define CPUID_14_0_ECX_LIP (1U << 31)
+/* RAS Features */
+#define CPUID_8000_0007_EBX_SUCCOR (1U << 1)
+
/* CLZERO instruction */
#define CPUID_8000_0008_EBX_CLZERO (1U << 0)
/* Always save/restore FP error pointers */
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 7e9fc0cac5..15a642a894 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -477,6 +477,8 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s, uint32_t
function,
*/
cpuid_1_edx = kvm_arch_get_supported_cpuid(s, 1, 0, R_EDX);
ret |= cpuid_1_edx & CPUID_EXT2_AMD_ALIASES;
+ } else if (function == 0x80000007 && reg == R_EBX) {
+ ret |= CPUID_8000_0007_EBX_SUCCOR;
} else if (function == KVM_CPUID_FEATURES && reg == R_EAX) {
/* kvm_pv_unhalt is reported by GET_SUPPORTED_CPUID, but it can't
* be enabled without the in-kernel irqchip
--
2.39.3
