aboutsummaryrefslogtreecommitdiff
path: root/target-i386
diff options
context:
space:
mode:
authorAshok Raj <ashok.raj@intel.com>2016-06-22 14:56:21 +0800
committerEduardo Habkost <ehabkost@redhat.com>2016-07-07 15:25:16 -0300
commit87f8b626041ceaea9adcfdbd549359f0ca7b871d (patch)
treefb58c95574a63176221118f6e710a75ae5c6f1d5 /target-i386
parentc35bd19a5c9140bce8b913cc5cefe6f071135bdb (diff)
target-i386: kvm: Add basic Intel LMCE support
This patch adds the support to inject SRAR and SRAO as LMCE, i.e. they are injected to only one VCPU rather than broadcast to all VCPUs. As KVM reports LMCE support on Intel platforms, this features is only available on Intel platforms. LMCE is disabled by default and can be enabled/disabled by cpu option 'lmce=on/off'. Signed-off-by: Ashok Raj <ashok.raj@intel.com> [Haozhong: Enable LMCE only on Intel platforms Disable LMCE by default and add a cpu option 'lmce' Handle the error if LMCE is enabled w/o host support Remove MCG_LMCE_P from MCE_CAP_DEF Add migration support for LMCE Minor code style changes] Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'target-i386')
-rw-r--r--target-i386/cpu.c4
-rw-r--r--target-i386/cpu.h12
-rw-r--r--target-i386/kvm.c36
-rw-r--r--target-i386/machine.c19
4 files changed, 67 insertions, 4 deletions
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 4e179b9b95..5bc7ce5d37 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -2839,7 +2839,8 @@ static void mce_init(X86CPU *cpu)
if (((cenv->cpuid_version >> 8) & 0xf) >= 6
&& (cenv->features[FEAT_1_EDX] & (CPUID_MCE | CPUID_MCA)) ==
(CPUID_MCE | CPUID_MCA)) {
- cenv->mcg_cap = MCE_CAP_DEF | MCE_BANKS_DEF;
+ cenv->mcg_cap = MCE_CAP_DEF | MCE_BANKS_DEF |
+ (cpu->enable_lmce ? MCG_LMCE_P : 0);
cenv->mcg_ctl = ~(uint64_t)0;
for (bank = 0; bank < MCE_BANKS_DEF; bank++) {
cenv->mce_banks[bank * 4] = ~(uint64_t)0;
@@ -3286,6 +3287,7 @@ static Property x86_cpu_properties[] = {
DEFINE_PROP_UINT32("xlevel2", X86CPU, env.cpuid_xlevel2, 0),
DEFINE_PROP_STRING("hv-vendor-id", X86CPU, hyperv_vendor_id),
DEFINE_PROP_BOOL("cpuid-0xb", X86CPU, enable_cpuid_0xb, true),
+ DEFINE_PROP_BOOL("lmce", X86CPU, enable_lmce, false),
DEFINE_PROP_END_OF_LIST()
};
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 3ae3e14f78..54c3fd6561 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -292,6 +292,7 @@
#define MCG_CTL_P (1ULL<<8) /* MCG_CAP register available */
#define MCG_SER_P (1ULL<<24) /* MCA recovery/new status bits */
+#define MCG_LMCE_P (1ULL<<27) /* Local Machine Check Supported */
#define MCE_CAP_DEF (MCG_CTL_P|MCG_SER_P)
#define MCE_BANKS_DEF 10
@@ -301,6 +302,9 @@
#define MCG_STATUS_RIPV (1ULL<<0) /* restart ip valid */
#define MCG_STATUS_EIPV (1ULL<<1) /* ip points to correct instruction */
#define MCG_STATUS_MCIP (1ULL<<2) /* machine check in progress */
+#define MCG_STATUS_LMCE (1ULL<<3) /* Local MCE signaled */
+
+#define MCG_EXT_CTL_LMCE_EN (1ULL<<0) /* Local MCE enabled */
#define MCI_STATUS_VAL (1ULL<<63) /* valid error */
#define MCI_STATUS_OVER (1ULL<<62) /* previous errors lost */
@@ -343,6 +347,7 @@
#define MSR_MCG_CAP 0x179
#define MSR_MCG_STATUS 0x17a
#define MSR_MCG_CTL 0x17b
+#define MSR_MCG_EXT_CTL 0x4d0
#define MSR_P6_EVNTSEL0 0x186
@@ -1114,6 +1119,7 @@ typedef struct CPUX86State {
uint64_t mcg_cap;
uint64_t mcg_ctl;
+ uint64_t mcg_ext_ctl;
uint64_t mce_banks[MCE_BANKS_DEF*4];
uint64_t tsc_aux;
@@ -1181,6 +1187,12 @@ struct X86CPU {
*/
bool enable_pmu;
+ /* LMCE support can be enabled/disabled via cpu option 'lmce=on/off'. It is
+ * disabled by default to avoid breaking migration between QEMU with
+ * different LMCE configurations.
+ */
+ bool enable_lmce;
+
/* Compatibility bits for old machine types: */
bool enable_cpuid_0xb;
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 4193fe1746..93275231ec 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -106,6 +106,8 @@ static int has_xsave;
static int has_xcrs;
static int has_pit_state2;
+static bool has_msr_mcg_ext_ctl;
+
static struct kvm_cpuid2 *cpuid_cache;
int kvm_has_pit_state2(void)
@@ -382,10 +384,12 @@ static int kvm_get_mce_cap_supported(KVMState *s, uint64_t *mce_cap,
static void kvm_mce_inject(X86CPU *cpu, hwaddr paddr, int code)
{
+ CPUState *cs = CPU(cpu);
CPUX86State *env = &cpu->env;
uint64_t status = MCI_STATUS_VAL | MCI_STATUS_UC | MCI_STATUS_EN |
MCI_STATUS_MISCV | MCI_STATUS_ADDRV | MCI_STATUS_S;
uint64_t mcg_status = MCG_STATUS_MCIP;
+ int flags = 0;
if (code == BUS_MCEERR_AR) {
status |= MCI_STATUS_AR | 0x134;
@@ -394,10 +398,19 @@ static void kvm_mce_inject(X86CPU *cpu, hwaddr paddr, int code)
status |= 0xc0;
mcg_status |= MCG_STATUS_RIPV;
}
+
+ flags = cpu_x86_support_mca_broadcast(env) ? MCE_INJECT_BROADCAST : 0;
+ /* We need to read back the value of MSR_EXT_MCG_CTL that was set by the
+ * guest kernel back into env->mcg_ext_ctl.
+ */
+ cpu_synchronize_state(cs);
+ if (env->mcg_ext_ctl & MCG_EXT_CTL_LMCE_EN) {
+ mcg_status |= MCG_STATUS_LMCE;
+ flags = 0;
+ }
+
cpu_x86_inject_mce(NULL, cpu, 9, status, mcg_status, paddr,
- (MCM_ADDR_PHYS << 6) | 0xc,
- cpu_x86_support_mca_broadcast(env) ?
- MCE_INJECT_BROADCAST : 0);
+ (MCM_ADDR_PHYS << 6) | 0xc, flags);
}
static void hardware_memory_error(void)
@@ -883,6 +896,10 @@ int kvm_arch_init_vcpu(CPUState *cs)
unsupported_caps = env->mcg_cap & ~(mcg_cap | MCG_CAP_BANKS_MASK);
if (unsupported_caps) {
+ if (unsupported_caps & MCG_LMCE_P) {
+ error_report("kvm: LMCE not supported");
+ return -ENOTSUP;
+ }
error_report("warning: Unsupported MCG_CAP bits: 0x%" PRIx64,
unsupported_caps);
}
@@ -903,6 +920,10 @@ int kvm_arch_init_vcpu(CPUState *cs)
!!(c->ecx & CPUID_EXT_SMX);
}
+ if (env->mcg_cap & MCG_LMCE_P) {
+ has_msr_mcg_ext_ctl = has_msr_feature_control = true;
+ }
+
c = cpuid_find_entry(&cpuid_data.cpuid, 0x80000007, 0);
if (c && (c->edx & 1<<8) && invtsc_mig_blocker == NULL) {
/* for migration */
@@ -1723,6 +1744,9 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
kvm_msr_entry_add(cpu, MSR_MCG_STATUS, env->mcg_status);
kvm_msr_entry_add(cpu, MSR_MCG_CTL, env->mcg_ctl);
+ if (has_msr_mcg_ext_ctl) {
+ kvm_msr_entry_add(cpu, MSR_MCG_EXT_CTL, env->mcg_ext_ctl);
+ }
for (i = 0; i < (env->mcg_cap & 0xff) * 4; i++) {
kvm_msr_entry_add(cpu, MSR_MC0_CTL + i, env->mce_banks[i]);
}
@@ -2026,6 +2050,9 @@ static int kvm_get_msrs(X86CPU *cpu)
if (env->mcg_cap) {
kvm_msr_entry_add(cpu, MSR_MCG_STATUS, 0);
kvm_msr_entry_add(cpu, MSR_MCG_CTL, 0);
+ if (has_msr_mcg_ext_ctl) {
+ kvm_msr_entry_add(cpu, MSR_MCG_EXT_CTL, 0);
+ }
for (i = 0; i < (env->mcg_cap & 0xff) * 4; i++) {
kvm_msr_entry_add(cpu, MSR_MC0_CTL + i, 0);
}
@@ -2154,6 +2181,9 @@ static int kvm_get_msrs(X86CPU *cpu)
case MSR_MCG_CTL:
env->mcg_ctl = msrs[i].data;
break;
+ case MSR_MCG_EXT_CTL:
+ env->mcg_ext_ctl = msrs[i].data;
+ break;
case MSR_IA32_MISC_ENABLE:
env->msr_ia32_misc_enable = msrs[i].data;
break;
diff --git a/target-i386/machine.c b/target-i386/machine.c
index cb9adf2b02..71c0e4dc47 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -896,6 +896,24 @@ static const VMStateDescription vmstate_tsc_khz = {
}
};
+static bool mcg_ext_ctl_needed(void *opaque)
+{
+ X86CPU *cpu = opaque;
+ CPUX86State *env = &cpu->env;
+ return cpu->enable_lmce && env->mcg_ext_ctl;
+}
+
+static const VMStateDescription vmstate_mcg_ext_ctl = {
+ .name = "cpu/mcg_ext_ctl",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .needed = mcg_ext_ctl_needed,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT64(env.mcg_ext_ctl, X86CPU),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
VMStateDescription vmstate_x86_cpu = {
.name = "cpu",
.version_id = 12,
@@ -1022,6 +1040,7 @@ VMStateDescription vmstate_x86_cpu = {
#ifdef TARGET_X86_64
&vmstate_pkru,
#endif
+ &vmstate_mcg_ext_ctl,
NULL
}
};