If hardware supports encrypting then KVM_MEMORY_ENCRYPT_OP ioctl can
be used by qemu to issue platform specific memory encryption commands.
Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/x86.c | 12 ++++++++++++
include/uapi/linux/kvm.h | 2 ++
3 files changed, 16 insertions(+)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index bff1f15..62651ad 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1033,6 +1033,8 @@ struct kvm_x86_ops {
void (*cancel_hv_timer)(struct kvm_vcpu *vcpu);
void (*setup_mce)(struct kvm_vcpu *vcpu);
+
+ int (*memory_encryption_op)(struct kvm *kvm, void __user *argp);
};
struct kvm_arch_async_pf {
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2099df8..6a737e9 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3926,6 +3926,14 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
return r;
}
+static int kvm_vm_ioctl_memory_encryption_op(struct kvm *kvm, void __user *argp)
+{
+ if (kvm_x86_ops->memory_encryption_op)
+ return kvm_x86_ops->memory_encryption_op(kvm, argp);
+
+ return -ENOTTY;
+}
+
long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@@ -4189,6 +4197,10 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = kvm_vm_ioctl_enable_cap(kvm, &cap);
break;
}
+ case KVM_MEMORY_ENCRYPT_OP: {
+ r = kvm_vm_ioctl_memory_encryption_op(kvm, argp);
+ break;
+ }
default:
r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index cac48ed..fef7d83 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1281,6 +1281,8 @@ struct kvm_s390_ucas_mapping {
#define KVM_S390_GET_IRQ_STATE _IOW(KVMIO, 0xb6, struct kvm_s390_irq_state)
/* Available with KVM_CAP_X86_SMM */
#define KVM_SMI _IO(KVMIO, 0xb7)
+/* Memory Encryption Commands */
+#define KVM_MEMORY_ENCRYPT_OP _IOWR(KVMIO, 0xb8, unsigned long)
#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
#define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1)
