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Subject[RFC Part2 PATCH v3 09/26] KVM: Introduce KVM_MEMORY_ENCRYPT_OP ioctl
Date
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@amd.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
---
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 7cbaab5..99a0e11 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1057,6 +1057,8 @@ 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 88be1aa..c9d3ff5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3974,6 +3974,14 @@ 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)
{
@@ -4234,6 +4242,10 @@ 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 = -ENOTTY;
}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 6cd63c1..ab3b711 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1355,6 +1355,8 @@ struct kvm_s390_ucas_mapping {
/* Available with KVM_CAP_S390_CMMA_MIGRATION */
#define KVM_S390_GET_CMMA_BITS _IOWR(KVMIO, 0xb8, struct kvm_s390_cmma_log)
#define KVM_S390_SET_CMMA_BITS _IOW(KVMIO, 0xb9, struct kvm_s390_cmma_log)
+/* Memory Encryption Commands */
+#define KVM_MEMORY_ENCRYPT_OP _IOWR(KVMIO, 0xba, unsigned long)

#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
#define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1)
--
2.9.4
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