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KVM: selftests: Force GUEST_MEMFD flag for SNP VM type

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

Signed-off-by: Pratik 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: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Pratik R. Sampat
2025-03-05 16:59:58 -06:00
committed by Sean Christopherson
parent 3bf3e0a521
commit b73a30cd9c
1 changed files with 19 additions and 2 deletions
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21
tools/testing/selftests/kvm/lib/kvm_util.c
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@@ -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;