This supports ioctl commands on vCPU to manage the various object.
It's primarily used by VMM to accomplish live migration. The ioctl
commands introduced by this are highlighted as below:
* KVM_SDEI_CMD_GET_VEVENT_COUNT
Retrieve number of SDEI events that pend for handling on the
vCPU
* KVM_SDEI_CMD_GET_VEVENT
Retrieve the state of SDEI event, which has been delivered to
the vCPU for handling
* KVM_SDEI_CMD_SET_VEVENT
Populate the SDEI event, which has been delivered to the vCPU
for handling
* KVM_SDEI_CMD_GET_VCPU_STATE
Retrieve vCPU state related to SDEI handling
* KVM_SDEI_CMD_SET_VCPU_STATE
Populate vCPU state related to SDEI handling
Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
---
arch/arm64/include/asm/kvm_sdei.h | 1 +
arch/arm64/include/uapi/asm/kvm_sdei.h | 7 +
arch/arm64/kvm/arm.c | 3 +
arch/arm64/kvm/sdei.c | 228 +++++++++++++++++++++++++
4 files changed, 239 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_sdei.h b/arch/arm64/include/asm/kvm_sdei.h
index 8f5ea947ed0e..a997989bab77 100644
--- a/arch/arm64/include/asm/kvm_sdei.h
+++ b/arch/arm64/include/asm/kvm_sdei.h
@@ -126,6 +126,7 @@ int kvm_sdei_register_notifier(struct kvm *kvm, unsigned long num,
kvm_sdei_notifier notifier);
void kvm_sdei_deliver(struct kvm_vcpu *vcpu);
long kvm_sdei_vm_ioctl(struct kvm *kvm, unsigned long arg);
+long kvm_sdei_vcpu_ioctl(struct kvm_vcpu *vcpu, unsigned long arg);
void kvm_sdei_destroy_vcpu(struct kvm_vcpu *vcpu);
void kvm_sdei_destroy_vm(struct kvm *kvm);
diff --git a/arch/arm64/include/uapi/asm/kvm_sdei.h b/arch/arm64/include/uapi/asm/kvm_sdei.h
index 323d7ff24662..1e96dbe2aa6f 100644
--- a/arch/arm64/include/uapi/asm/kvm_sdei.h
+++ b/arch/arm64/include/uapi/asm/kvm_sdei.h
@@ -62,6 +62,11 @@ struct kvm_sdei_vcpu_state {
#define KVM_SDEI_CMD_GET_KEVENT_COUNT 2
#define KVM_SDEI_CMD_GET_KEVENT 3
#define KVM_SDEI_CMD_SET_KEVENT 4
+#define KVM_SDEI_CMD_GET_VEVENT_COUNT 5
+#define KVM_SDEI_CMD_GET_VEVENT 6
+#define KVM_SDEI_CMD_SET_VEVENT 7
+#define KVM_SDEI_CMD_GET_VCPU_STATE 8
+#define KVM_SDEI_CMD_SET_VCPU_STATE 9
struct kvm_sdei_cmd {
__u32 cmd;
@@ -71,6 +76,8 @@ struct kvm_sdei_cmd {
__u64 num;
struct kvm_sdei_event_state kse_state;
struct kvm_sdei_kvm_event_state kske_state;
+ struct kvm_sdei_vcpu_event_state ksve_state;
+ struct kvm_sdei_vcpu_state ksv_state;
};
};
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 490c1c62702b..0f4ccec7dc04 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1272,6 +1272,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
return kvm_arm_vcpu_finalize(vcpu, what);
}
+ case KVM_ARM_SDEI_COMMAND: {
+ return kvm_sdei_vcpu_ioctl(vcpu, arg);
+ }
default:
r = -EINVAL;
}
diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index bdd76c3e5153..79315b77f24b 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -35,6 +35,25 @@ static struct kvm_sdei_event *kvm_sdei_find_event(struct kvm *kvm,
return NULL;
}
+static struct kvm_sdei_vcpu_event *kvm_sdei_find_vcpu_event(struct kvm_vcpu *vcpu,
+ unsigned long num)
+{
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ struct kvm_sdei_vcpu_event *ksve;
+
+ list_for_each_entry(ksve, &vsdei->critical_events, link) {
+ if (ksve->state.num == num)
+ return ksve;
+ }
+
+ list_for_each_entry(ksve, &vsdei->normal_events, link) {
+ if (ksve->state.num == num)
+ return ksve;
+ }
+
+ return NULL;
+}
+
static void kvm_sdei_remove_events(struct kvm *kvm)
{
struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
@@ -1102,6 +1121,215 @@ long kvm_sdei_vm_ioctl(struct kvm *kvm, unsigned long arg)
return ret;
}
+static long kvm_sdei_get_vevent_count(struct kvm_vcpu *vcpu, int *count)
+{
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ struct kvm_sdei_vcpu_event *ksve = NULL;
+ int total = 0;
+
+ list_for_each_entry(ksve, &vsdei->critical_events, link) {
+ total++;
+ }
+
+ list_for_each_entry(ksve, &vsdei->normal_events, link) {
+ total++;
+ }
+
+ *count = total;
+ return 0;
+}
+
+static struct kvm_sdei_vcpu_event *next_vcpu_event(struct kvm_vcpu *vcpu,
+ unsigned long num)
+{
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ struct kvm_sdei_event *kse = NULL;
+ struct kvm_sdei_kvm_event *kske = NULL;
+ struct kvm_sdei_vcpu_event *ksve = NULL;
+
+ ksve = kvm_sdei_find_vcpu_event(vcpu, num);
+ if (!ksve)
+ return NULL;
+
+ kske = ksve->kske;
+ kse = kske->kse;
+ if (kse->state.priority == SDEI_EVENT_PRIORITY_CRITICAL) {
+ if (!list_is_last(&ksve->link, &vsdei->critical_events)) {
+ ksve = list_next_entry(ksve, link);
+ return ksve;
+ }
+
+ ksve = list_first_entry_or_null(&vsdei->normal_events,
+ struct kvm_sdei_vcpu_event, link);
+ return ksve;
+ }
+
+ if (!list_is_last(&ksve->link, &vsdei->normal_events)) {
+ ksve = list_next_entry(ksve, link);
+ return ksve;
+ }
+
+ return NULL;
+}
+
+static long kvm_sdei_get_vevent(struct kvm_vcpu *vcpu,
+ struct kvm_sdei_vcpu_event_state *ksve_state)
+{
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ struct kvm_sdei_vcpu_event *ksve = NULL;
+
+ /*
+ * If the event number is invalid, the first critical or
+ * normal event is fetched. Otherwise, the next valid event
+ * is returned.
+ */
+ if (!kvm_sdei_is_valid_event_num(ksve_state->num)) {
+ ksve = list_first_entry_or_null(&vsdei->critical_events,
+ struct kvm_sdei_vcpu_event, link);
+ if (!ksve) {
+ ksve = list_first_entry_or_null(&vsdei->normal_events,
+ struct kvm_sdei_vcpu_event, link);
+ }
+ } else {
+ ksve = next_vcpu_event(vcpu, ksve_state->num);
+ }
+
+ if (!ksve)
+ return -ENOENT;
+
+ *ksve_state = ksve->state;
+
+ return 0;
+}
+
+static long kvm_sdei_set_vevent(struct kvm_vcpu *vcpu,
+ struct kvm_sdei_vcpu_event_state *ksve_state)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ struct kvm_sdei_event *kse = NULL;
+ struct kvm_sdei_kvm_event *kske = NULL;
+ struct kvm_sdei_vcpu_event *ksve = NULL;
+
+ if (!kvm_sdei_is_valid_event_num(ksve_state->num))
+ return -EINVAL;
+
+ kske = kvm_sdei_find_kvm_event(kvm, ksve_state->num);
+ if (!kske)
+ return -ENOENT;
+
+ ksve = kvm_sdei_find_vcpu_event(vcpu, ksve_state->num);
+ if (ksve)
+ return -EEXIST;
+
+ ksve = kzalloc(sizeof(*ksve), GFP_KERNEL);
+ if (!ksve)
+ return -ENOMEM;
+
+ kse = kske->kse;
+ ksve->state = *ksve_state;
+ ksve->kske = kske;
+ ksve->vcpu = vcpu;
+
+ if (kse->state.priority == SDEI_EVENT_PRIORITY_CRITICAL)
+ list_add_tail(&ksve->link, &vsdei->critical_events);
+ else
+ list_add_tail(&ksve->link, &vsdei->normal_events);
+
+ kvm_make_request(KVM_REQ_SDEI, vcpu);
+
+ return 0;
+}
+
+static long kvm_sdei_set_vcpu_state(struct kvm_vcpu *vcpu,
+ struct kvm_sdei_vcpu_state *ksv_state)
+{
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ struct kvm_sdei_vcpu_event *critical_ksve = NULL;
+ struct kvm_sdei_vcpu_event *normal_ksve = NULL;
+
+ if (kvm_sdei_is_valid_event_num(ksv_state->critical_num)) {
+ critical_ksve = kvm_sdei_find_vcpu_event(vcpu,
+ ksv_state->critical_num);
+ if (!critical_ksve)
+ return -EINVAL;
+ }
+
+ if (kvm_sdei_is_valid_event_num(ksv_state->critical_num)) {
+ normal_ksve = kvm_sdei_find_vcpu_event(vcpu,
+ ksv_state->critical_num);
+ if (!normal_ksve)
+ return -EINVAL;
+ }
+
+ vsdei->state = *ksv_state;
+ vsdei->critical_event = critical_ksve;
+ vsdei->normal_event = normal_ksve;
+
+ return 0;
+}
+
+long kvm_sdei_vcpu_ioctl(struct kvm_vcpu *vcpu, unsigned long arg)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ struct kvm_sdei_cmd *cmd = NULL;
+ void __user *argp = (void __user *)arg;
+ bool copy = false;
+ long ret = 0;
+
+ /* Sanity check */
+ if (!(ksdei && vsdei)) {
+ ret = -EPERM;
+ goto out;
+ }
+
+ cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
+ if (!cmd) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (copy_from_user(cmd, argp, sizeof(*cmd))) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ spin_lock(&vsdei->lock);
+
+ switch (cmd->cmd) {
+ case KVM_SDEI_CMD_GET_VEVENT_COUNT:
+ copy = true;
+ ret = kvm_sdei_get_vevent_count(vcpu, &cmd->count);
+ break;
+ case KVM_SDEI_CMD_GET_VEVENT:
+ copy = true;
+ ret = kvm_sdei_get_vevent(vcpu, &cmd->ksve_state);
+ break;
+ case KVM_SDEI_CMD_SET_VEVENT:
+ ret = kvm_sdei_set_vevent(vcpu, &cmd->ksve_state);
+ break;
+ case KVM_SDEI_CMD_GET_VCPU_STATE:
+ copy = true;
+ cmd->ksv_state = vsdei->state;
+ break;
+ case KVM_SDEI_CMD_SET_VCPU_STATE:
+ ret = kvm_sdei_set_vcpu_state(vcpu, &cmd->ksv_state);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ spin_unlock(&vsdei->lock);
+out:
+ if (!ret && copy && copy_to_user(argp, cmd, sizeof(*cmd)))
+ ret = -EFAULT;
+
+ kfree(cmd);
+ return ret;
+}
+
void kvm_sdei_destroy_vcpu(struct kvm_vcpu *vcpu)
{
struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
--
2.23.0
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