On 8/12/2025 4:31 AM, Sean Christopherson wrote:
On Thu, Aug 07, 2025, Sagi Shahar wrote:
[...]
+
/*
* TD creation/setup/finalization
*/
@@ -459,28 +474,35 @@ static void load_td_memory_region(struct kvm_vm *vm,
if (!sparsebit_any_set(pages))
return;
+ if (region->region.guest_memfd != -1)
+ register_encrypted_memory_region(vm, region);
+
sparsebit_for_each_set_range(pages, i, j) {
const uint64_t size_to_load = (j - i + 1) * vm->page_size;
const uint64_t offset =
(i - lowest_page_in_region) * vm->page_size;
const uint64_t hva = hva_base + offset;
const uint64_t gpa = gpa_base + offset;
- void *source_addr;
+ void *source_addr = (void *)hva;
/*
* KVM_TDX_INIT_MEM_REGION ioctl cannot encrypt memory in place.
* Make a copy if there's only one backing memory source.
*/
- source_addr = mmap(NULL, size_to_load, PROT_READ | PROT_WRITE,
- MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
- TEST_ASSERT(source_addr,
- "Could not allocate memory for loading memory
region");
-
- memcpy(source_addr, (void *)hva, size_to_load);
+ if (region->region.guest_memfd == -1) {
Oh, here's the "if".
Is it still possible for "region->region.guest_memfd == -1" case?
KVM_TDX_INIT_MEM_REGION can only work with guest memfd, right?
+ source_addr = mmap(NULL, size_to_load, PROT_READ |
PROT_WRITE,
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ TEST_ASSERT(source_addr,
+ "Could not allocate memory for loading memory
region");
+
+ memcpy(source_addr, (void *)hva, size_to_load);
+ memset((void *)hva, 0, size_to_load);
+ }
tdx_init_mem_region(vm, source_addr, gpa, size_to_load);
- munmap(source_addr, size_to_load);
+ if (region->region.guest_memfd == -1)
+ munmap(source_addr, size_to_load);
}
}
--
2.51.0.rc0.155.g4a0f42376b-goog
