[PATCH v16 24/45] KVM: arm64: Expose support for private memory

[Steven Price <steven.price@arm.com>]

Select KVM_GENERIC_MEMORY_ATTRIBUTES and provide the necessary support
functions.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
Changes since v14:
 * Switch to guest_memfd in-place memory conversion and drop support
   for KVM_VM_MEMORY_ATTRIBUTES.
Changes since v13:
 * Also update documentation to show that KVM_CAP_MEMORY_ATTRIBUTES is
   used on arm64.
Changes since v12:
 * Only define kvm_arch_has_private_mem() when
   CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES is set to avoid build issues
   when KVM is disabled.
Changes since v10:
 * KVM_GENERIC_PRIVATE_MEM replacd with KVM_GENERIC_MEMORY_ATTRIBUTES.
Changes since v9:
 * Drop the #ifdef CONFIG_KVM_PRIVATE_MEM guard from the definition of
   kvm_arch_has_private_mem()
Changes since v2:
 * Switch kvm_arch_has_private_mem() to a macro to avoid overhead of a
   function call.
 * Guard definitions of kvm_arch_{pre,post}_set_memory_attributes() with
   #ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES.
 * Early out in kvm_arch_post_set_memory_attributes() if the WARN_ON
   should trigger.
---
 arch/arm64/include/asm/kvm_host.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 15d42d1993bb..146c52f867c0 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -1510,6 +1510,8 @@ struct kvm *kvm_arch_alloc_vm(void);
 
 #define vcpu_is_protected(vcpu)		kvm_vm_is_protected((vcpu)->kvm)
 
+#define kvm_arch_has_private_mem(kvm) ((kvm)->arch.is_realm)
+
 int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature);
 bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu);
 
-- 
2.43.0