This supports ioctl commands on VM to manage the various objects.
It's primarily used by VMM to accomplish live migration. The ioctl
commands introduced by this are highlighted as blow:
* KVM_SDEI_CMD_GET_VERSION
Retrieve the version of current implementation
* KVM_SDEI_CMD_SET_EVENT
Add event to be exported from KVM so that guest can register
against it afterwards
* KVM_SDEI_CMD_GET_KEVENT_COUNT
Retrieve number of registered SDEI events
* KVM_SDEI_CMD_GET_KEVENT
Retrieve the state of the registered SDEI event
* KVM_SDEI_CMD_SET_KEVENT
Populate the registered SDEI event
Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
---
arch/arm64/include/asm/kvm_sdei.h | 1 +
arch/arm64/include/uapi/asm/kvm_sdei.h | 17 +++
arch/arm64/kvm/arm.c | 3 +
arch/arm64/kvm/sdei.c | 171 +++++++++++++++++++++++++
include/uapi/linux/kvm.h | 3 +
5 files changed, 195 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_sdei.h b/arch/arm64/include/asm/kvm_sdei.h
index 19f2d9b91f85..8f5ea947ed0e 100644
--- a/arch/arm64/include/asm/kvm_sdei.h
+++ b/arch/arm64/include/asm/kvm_sdei.h
@@ -125,6 +125,7 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu);
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);
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 20ad724f63c8..55de8baff841 100644
--- a/arch/arm64/include/uapi/asm/kvm_sdei.h
+++ b/arch/arm64/include/uapi/asm/kvm_sdei.h
@@ -54,4 +54,21 @@ struct kvm_sdei_vcpu_state {
struct kvm_sdei_vcpu_regs normal_regs;
};
+#define KVM_SDEI_CMD_GET_VERSION 0
+#define KVM_SDEI_CMD_SET_EVENT 1
+#define KVM_SDEI_CMD_GET_KEVENT_COUNT 2
+#define KVM_SDEI_CMD_GET_KEVENT 3
+#define KVM_SDEI_CMD_SET_KEVENT 4
+
+struct kvm_sdei_cmd {
+ uint32_t cmd;
+ union {
+ uint32_t version;
+ uint32_t count;
+ uint64_t num;
+ struct kvm_sdei_event_state kse_state;
+ struct kvm_sdei_kvm_event_state kske_state;
+ };
+};
+
#endif /* _UAPI__ASM_KVM_SDEI_H */
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index e243bd5ad730..96b41bf1d094 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1334,6 +1334,9 @@ long kvm_arch_vm_ioctl(struct file *filp,
return 0;
}
+ case KVM_ARM_SDEI_COMMAND: {
+ return kvm_sdei_vm_ioctl(kvm, arg);
+ }
default:
return -EINVAL;
}
diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index 5f7a37dcaa77..bdd76c3e5153 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -931,6 +931,177 @@ void kvm_sdei_create_vcpu(struct kvm_vcpu *vcpu)
vcpu->arch.sdei = vsdei;
}
+static long kvm_sdei_set_event(struct kvm *kvm,
+ struct kvm_sdei_event_state *kse_state)
+{
+ struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+ struct kvm_sdei_event *kse = NULL;
+
+ if (!kvm_sdei_is_valid_event_num(kse_state->num))
+ return -EINVAL;
+
+ if (!(kse_state->type == SDEI_EVENT_TYPE_SHARED ||
+ kse_state->type == SDEI_EVENT_TYPE_PRIVATE))
+ return -EINVAL;
+
+ if (!(kse_state->priority == SDEI_EVENT_PRIORITY_NORMAL ||
+ kse_state->priority == SDEI_EVENT_PRIORITY_CRITICAL))
+ return -EINVAL;
+
+ kse = kvm_sdei_find_event(kvm, kse_state->num);
+ if (kse)
+ return -EEXIST;
+
+ kse = kzalloc(sizeof(*kse), GFP_KERNEL);
+ if (!kse)
+ return -ENOMEM;
+
+ kse->state = *kse_state;
+ kse->kvm = kvm;
+ list_add_tail(&kse->link, &ksdei->events);
+
+ return 0;
+}
+
+static long kvm_sdei_get_kevent_count(struct kvm *kvm, int *count)
+{
+ struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+ struct kvm_sdei_kvm_event *kske = NULL;
+ int total = 0;
+
+ list_for_each_entry(kske, &ksdei->kvm_events, link) {
+ total++;
+ }
+
+ *count = total;
+ return 0;
+}
+
+static long kvm_sdei_get_kevent(struct kvm *kvm,
+ struct kvm_sdei_kvm_event_state *kske_state)
+{
+ struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+ struct kvm_sdei_kvm_event *kske = NULL;
+
+ /*
+ * The first entry is fetched if the event number is invalid.
+ * Otherwise, the next entry is fetched.
+ */
+ if (!kvm_sdei_is_valid_event_num(kske_state->num)) {
+ kske = list_first_entry_or_null(&ksdei->kvm_events,
+ struct kvm_sdei_kvm_event, link);
+ } else {
+ kske = kvm_sdei_find_kvm_event(kvm, kske_state->num);
+ if (kske && !list_is_last(&kske->link, &ksdei->kvm_events))
+ kske = list_next_entry(kske, link);
+ else
+ kske = NULL;
+ }
+
+ if (!kske)
+ return -ENOENT;
+
+ *kske_state = kske->state;
+
+ return 0;
+}
+
+static long kvm_sdei_set_kevent(struct kvm *kvm,
+ struct kvm_sdei_kvm_event_state *kske_state)
+{
+ struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+ struct kvm_sdei_event *kse = NULL;
+ struct kvm_sdei_kvm_event *kske = NULL;
+
+ /* Sanity check */
+ if (!kvm_sdei_is_valid_event_num(kske_state->num))
+ return -EINVAL;
+
+ if (!(kske_state->route_mode == SDEI_EVENT_REGISTER_RM_ANY ||
+ kske_state->route_mode == SDEI_EVENT_REGISTER_RM_PE))
+ return -EINVAL;
+
+ /* Check if the event number is valid */
+ kse = kvm_sdei_find_event(kvm, kske_state->num);
+ if (!kse)
+ return -ENOENT;
+
+ /* Check if the event has been populated */
+ kske = kvm_sdei_find_kvm_event(kvm, kske_state->num);
+ if (kske)
+ return -EEXIST;
+
+ kske = kzalloc(sizeof(*kske), GFP_KERNEL);
+ if (!kske)
+ return -ENOMEM;
+
+ kske->state = *kske_state;
+ kske->kse = kse;
+ kske->kvm = kvm;
+ list_add_tail(&kske->link, &ksdei->kvm_events);
+
+ return 0;
+}
+
+long kvm_sdei_vm_ioctl(struct kvm *kvm, unsigned long arg)
+{
+ struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+ struct kvm_sdei_cmd *cmd = NULL;
+ void __user *argp = (void __user *)arg;
+ bool copy = false;
+ long ret = 0;
+
+ /* Sanity check */
+ if (!ksdei) {
+ 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(&ksdei->lock);
+
+ switch (cmd->cmd) {
+ case KVM_SDEI_CMD_GET_VERSION:
+ copy = true;
+ cmd->version = (1 << 16); /* v1.0.0 */
+ break;
+ case KVM_SDEI_CMD_SET_EVENT:
+ ret = kvm_sdei_set_event(kvm, &cmd->kse_state);
+ break;
+ case KVM_SDEI_CMD_GET_KEVENT_COUNT:
+ copy = true;
+ ret = kvm_sdei_get_kevent_count(kvm, &cmd->count);
+ break;
+ case KVM_SDEI_CMD_GET_KEVENT:
+ copy = true;
+ ret = kvm_sdei_get_kevent(kvm, &cmd->kske_state);
+ break;
+ case KVM_SDEI_CMD_SET_KEVENT:
+ ret = kvm_sdei_set_kevent(kvm, &cmd->kske_state);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ spin_unlock(&ksdei->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;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 374c67875cdb..b056b4ac884b 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1565,6 +1565,9 @@ struct kvm_pv_cmd {
/* Available with KVM_CAP_DIRTY_LOG_RING */
#define KVM_RESET_DIRTY_RINGS _IO(KVMIO, 0xc7)
+/* Available with KVM_CAP_ARM_SDEI */
+#define KVM_ARM_SDEI_COMMAND _IOWR(KVMIO, 0xc8, struct kvm_sdei_cmd)
+
/* Secure Encrypted Virtualization command */
enum sev_cmd_id {
/* Guest initialization commands */
--
2.23.0
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