Commit b73a30cd authored by Pratik R. Sampat's avatar Pratik R. Sampat Committed by Sean Christopherson
Browse files

KVM: selftests: Force GUEST_MEMFD flag for SNP VM type 



Force the SEV-SNP VM type to set the KVM_MEM_GUEST_MEMFD flag for the
creation of private memslots.

Signed-off-by: default avatarPratik R. Sampat <prsampat@amd.com>
Link: https://lore.kernel.org/r/20250305230000.231025-9-prsampat@amd.com


[sean: add a comment, don't break non-x86]
Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent 3bf3e0a5

tools/testing/selftests/kvm/lib/kvm_util.c

+19 −2
Original line number Diff line number Diff line
@@ -444,6 +444,15 @@ void kvm_set_files_rlimit(uint32_t nr_vcpus) 


}



static bool is_guest_memfd_required(struct vm_shape shape)

{

#ifdef __x86_64__

	return shape.type == KVM_X86_SNP_VM;

#else

	return false;

#endif

}



struct kvm_vm *__vm_create(struct vm_shape shape, uint32_t nr_runnable_vcpus,

			   uint64_t nr_extra_pages)

{
@@ -451,7 +460,7 @@ struct kvm_vm *__vm_create(struct vm_shape shape, uint32_t nr_runnable_vcpus, 
						 nr_extra_pages);

	struct userspace_mem_region *slot0;

	struct kvm_vm *vm;

	int i;

	int i, flags;



	kvm_set_files_rlimit(nr_runnable_vcpus);
@@ -460,7 +469,15 @@ struct kvm_vm *__vm_create(struct vm_shape shape, uint32_t nr_runnable_vcpus, 


	vm = ____vm_create(shape);



	vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, 0, 0, nr_pages, 0);

	/*

	 * Force GUEST_MEMFD for the primary memory region if necessary, e.g.

	 * for CoCo VMs that require GUEST_MEMFD backed private memory.

	 */

	flags = 0;

	if (is_guest_memfd_required(shape))

		flags |= KVM_MEM_GUEST_MEMFD;



	vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, 0, 0, nr_pages, flags);

	for (i = 0; i < NR_MEM_REGIONS; i++)

		vm->memslots[i] = 0;