KVM ioctls are used to initialize MCE simulation and inject MCE. The
real MCE simulation is implemented in Linux kernel.
ChangeLog:
v3:
- Re-based on qemu/tcg MCE support patch
v2:
- Use new kernel MCE capability exportion interface.
Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>
---
kvm/kernel/arch/x86/include/asm/kvm.h | 1
kvm/kernel/include/linux/kvm.h | 21 +++++++++++++++++
kvm/libkvm/libkvm-x86.c | 39 +++++++++++++++++++++++++++++++++
kvm/libkvm/libkvm.h | 4 +++
qemu-kvm-x86.c | 23 +++++++++++++++++++
qemu-kvm.c | 40 ++++++++++++++++++++++++++++++++++
qemu-kvm.h | 3 ++
target-i386/helper.c | 5 ++++
8 files changed, 136 insertions(+)
--- a/kvm/libkvm/libkvm-x86.c
+++ b/kvm/libkvm/libkvm-x86.c
@@ -378,6 +378,45 @@ int kvm_set_msrs(kvm_context_t kvm, int
return r;
}
+int kvm_get_mce_cap_supported(kvm_context_t kvm, uint64_t *mce_cap,
+ int *max_banks)
+{
+#ifdef KVM_CAP_MCE
+ int r;
+
+ r = ioctl(kvm->fd, KVM_CHECK_EXTENSION, KVM_CAP_MCE);
+ if (r > 0) {
+ *max_banks = r;
+ return ioctl(kvm->fd, KVM_X86_GET_MCE_CAP_SUPPORTED, mce_cap);
+ }
+#endif
+ return -ENOSYS;
+}
+
+int kvm_setup_mce(kvm_context_t kvm, int vcpu, uint64_t *mcg_cap)
+{
+#ifdef KVM_CAP_MCE
+ int r;
+
+ r = ioctl(kvm->fd, KVM_CHECK_EXTENSION, KVM_CAP_MCE);
+ if (r > 0)
+ return ioctl(kvm->vcpu_fd[vcpu], KVM_X86_SETUP_MCE, mcg_cap);
+#endif
+ return -ENOSYS;
+}
+
+int kvm_set_mce(kvm_context_t kvm, int vcpu, struct kvm_x86_mce *m)
+{
+#ifdef KVM_CAP_MCE
+ int r;
+
+ r = ioctl(kvm->fd, KVM_CHECK_EXTENSION, KVM_CAP_MCE);
+ if (r > 0)
+ return ioctl(kvm->vcpu_fd[vcpu], KVM_X86_SET_MCE, m);
+#endif
+ return -ENOSYS;
+}
+
static void print_seg(FILE *file, const char *name, struct kvm_segment *seg)
{
fprintf(stderr,
--- a/kvm/libkvm/libkvm.h
+++ b/kvm/libkvm/libkvm.h
@@ -27,6 +27,10 @@ typedef struct kvm_context *kvm_context_
struct kvm_msr_list *kvm_get_msr_list(kvm_context_t);
int kvm_get_msrs(kvm_context_t, int vcpu, struct kvm_msr_entry *msrs, int n);
int kvm_set_msrs(kvm_context_t, int vcpu, struct kvm_msr_entry *msrs, int n);
+int kvm_get_mce_cap_supported(kvm_context_t, uint64_t *mce_cap, int *max_banks);
+int kvm_setup_mce(kvm_context_t, int vcpu, uint64_t *mcg_cap);
+struct kvm_x86_mce;
+int kvm_set_mce(kvm_context_t, int vcpu, struct kvm_x86_mce *mce);
#endif
/*!
--- a/qemu-kvm-x86.c
+++ b/qemu-kvm-x86.c
@@ -566,6 +566,29 @@ int kvm_arch_qemu_init_env(CPUState *cen
do_cpuid_ent(&cpuid_ent[cpuid_nent++], i, 0, ©);
kvm_setup_cpuid2(kvm_context, cenv->cpu_index, cpuid_nent, cpuid_ent);
+
+#ifdef KVM_CAP_MCE
+ if (((cenv->cpuid_version >> 8)&0xF) >= 6
+ && (cenv->cpuid_features&(CPUID_MCE|CPUID_MCA)) == (CPUID_MCE|CPUID_MCA)
+ && kvm_check_extension(kvm_context, KVM_CAP_MCE) > 0) {
+ uint64_t mcg_cap;
+ int banks;
+
+ if (kvm_get_mce_cap_supported(kvm_context, &mcg_cap, &banks))
+ perror("kvm_get_mce_cap_supported FAILED");
+ else {
+ if (banks > MCE_BANKS_DEF)
+ banks = MCE_BANKS_DEF;
+ mcg_cap &= MCE_CAP_DEF;
+ mcg_cap |= banks;
+ if (kvm_setup_mce(kvm_context, cenv->cpu_index, &mcg_cap))
+ perror("kvm_setup_mce FAILED");
+ else
+ cenv->mcg_cap = mcg_cap;
+ }
+ }
+#endif
+
return 0;
}
--- a/qemu-kvm.h
+++ b/qemu-kvm.h
@@ -233,4 +233,7 @@ static inline void cpu_synchronize_state
}
}
+void kvm_inject_x86_mce(CPUState *cenv, int bank, uint64_t status,
+ uint64_t mcg_status, uint64_t addr, uint64_t misc);
+
#endif
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -1442,6 +1442,11 @@ void cpu_inject_x86_mce(CPUState *cenv,
unsigned bank_num = mcg_cap & 0xff;
uint64_t *banks = cenv->mce_banks;
+ if (kvm_enabled()) {
+ kvm_inject_x86_mce(cenv, bank, status, mcg_status, addr, misc);
+ return;
+ }
+
if (bank >= bank_num || !(status & MCI_STATUS_VAL))
return;
--- a/kvm/kernel/include/linux/kvm.h
+++ b/kvm/kernel/include/linux/kvm.h
@@ -455,6 +455,9 @@ struct kvm_trace_rec {
#define KVM_CAP_ASSIGN_DEV_IRQ 29
/* Another bug in KVM_SET_USER_MEMORY_REGION fixed: */
#define KVM_CAP_JOIN_MEMORY_REGIONS_WORKS 30
+#ifdef __KVM_HAVE_MCE
+#define KVM_CAP_MCE 31
+#endif
#ifdef KVM_CAP_IRQ_ROUTING
@@ -494,6 +497,20 @@ struct kvm_irq_routing {
#endif
+#ifdef KVM_CAP_MCE
+/* x86 MCE */
+struct kvm_x86_mce {
+ __u64 status;
+ __u64 addr;
+ __u64 misc;
+ __u64 mcg_status;
+ __u8 bank;
+ __u8 pad1;
+ __u16 pad2;
+ __u32 pad3;
+};
+#endif
+
/*
* ioctls for VM fds
*/
@@ -581,6 +598,10 @@ struct kvm_irq_routing {
#define KVM_NMI _IO(KVMIO, 0x9a)
/* Available with KVM_CAP_SET_GUEST_DEBUG */
#define KVM_SET_GUEST_DEBUG _IOW(KVMIO, 0x9b, struct kvm_guest_debug)
+/* MCE for x86 */
+#define KVM_X86_SETUP_MCE _IOW(KVMIO, 0x9c, __u64)
+#define KVM_X86_GET_MCE_CAP_SUPPORTED _IOR(KVMIO, 0x9d, __u64)
+#define KVM_X86_SET_MCE _IOW(KVMIO, 0x9e, struct kvm_x86_mce)
/*
* Deprecated interfaces
--- a/kvm/kernel/arch/x86/include/asm/kvm.h
+++ b/kvm/kernel/arch/x86/include/asm/kvm.h
@@ -57,6 +57,7 @@
#define __KVM_HAVE_USER_NMI
#define __KVM_HAVE_GUEST_DEBUG
#define __KVM_HAVE_MSIX
+#define __KVM_HAVE_MCE
/* Architectural interrupt line count. */
#define KVM_NR_INTERRUPTS 256
--- a/qemu-kvm.c
+++ b/qemu-kvm.c
@@ -1425,3 +1425,43 @@ void qemu_kvm_cpu_stop(CPUState *env)
if (kvm_enabled())
env->kvm_cpu_state.stopped = 1;
}
+
+#ifdef TARGET_I386
+#ifdef KVM_CAP_MCE
+struct kvm_x86_mce_data
+{
+ CPUState *env;
+ struct kvm_x86_mce *mce;
+};
+
+static void kvm_do_inject_x86_mce(void *_data)
+{
+ struct kvm_x86_mce_data *data = _data;
+ int r;
+
+ r = kvm_set_mce(kvm_context, data->env->cpu_index, data->mce);
+ if (r < 0)
+ perror("kvm_set_mce FAILED");
+}
+#endif
+
+void kvm_inject_x86_mce(CPUState *cenv, int bank, uint64_t status,
+ uint64_t mcg_status, uint64_t addr, uint64_t misc)
+{
+#ifdef KVM_CAP_MCE
+ struct kvm_x86_mce mce = {
+ .bank = bank,
+ .status = status,
+ .mcg_status = mcg_status,
+ .addr = addr,
+ .misc = misc,
+ };
+ struct kvm_x86_mce_data data = {
+ .env = cenv,
+ .mce = &mce,
+ };
+
+ on_vcpu(cenv, kvm_do_inject_x86_mce, &data);
+#endif
+}
+#endif
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