The default attributes for guest_memfd pages without in-place conversion is private. However, the ucall pages need to be shared between the host and the guest. Thus, set them as shared.
Signed-off-by: Lisa Wang <[email protected]> --- tools/testing/selftests/kvm/lib/ucall_common.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/testing/selftests/kvm/lib/ucall_common.c b/tools/testing/selftests/kvm/lib/ucall_common.c index 029ce21f9f2f..c03dfc763172 100644 --- a/tools/testing/selftests/kvm/lib/ucall_common.c +++ b/tools/testing/selftests/kvm/lib/ucall_common.c @@ -27,6 +27,7 @@ static struct ucall_header *ucall_pool; void ucall_init(struct kvm_vm *vm, gpa_t mmio_gpa) { + struct userspace_mem_region *region; struct ucall_header *hdr; struct ucall *uc; gva_t gva; @@ -37,6 +38,13 @@ void ucall_init(struct kvm_vm *vm, gpa_t mmio_gpa) hdr = (struct ucall_header *)addr_gva2hva(vm, gva); memset(hdr, 0, sizeof(*hdr)); + region = vm_get_mem_region(vm, MEM_REGION_DATA); + if (region->region.flags & KVM_MEM_GUEST_MEMFD) { + size_t aligned_sz = align_up(sizeof(*hdr), vm->page_size); + + vm_mem_set_shared(vm, addr_gva2gpa(vm, gva), aligned_sz); + } + for (i = 0; i < KVM_MAX_VCPUS; ++i) { uc = &hdr->ucalls[i]; uc->hva = uc; -- 2.56.0.rc1.315.gc6ed9934b7-goog
