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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Rspamd-Queue-Id: B5083C001A X-Rspamd-Server: rspam02 X-Stat-Signature: h6hu58b4c9anjfdp9ax38k4m4iam938o X-Rspam-User: X-HE-Tag: 1764954016-733605 X-HE-Meta: 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 UxJkuy4A 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Patrick Roy =0A= =0A= Add a selftest that loads itself into guest_memfd (via=0A= GUEST_MEMFD_FLAG_MMAP) and triggers an MMIO exit when executed. This=0A= exercises x86 MMIO emulation code inside KVM for guest_memfd-backed=0A= memslots where the guest_memfd folios are direct map removed.=0A= Particularly, it validates that x86 MMIO emulation code (guest page=0A= table walks + instruction fetch) correctly accesses gmem through the VMA=0A= that's been reflected into the memslot's userspace_addr field (instead=0A= of trying to do direct map accesses).=0A= =0A= Signed-off-by: Patrick Roy =0A= Signed-off-by: Nikita Kalyazin =0A= ---=0A= .../selftests/kvm/set_memory_region_test.c | 52 +++++++++++++++++--=0A= 1 file changed, 48 insertions(+), 4 deletions(-)=0A= =0A= diff --git a/tools/testing/selftests/kvm/set_memory_region_test.c b/tools/t= esting/selftests/kvm/set_memory_region_test.c=0A= index 7fe427ff9b38..6c57fb036b20 100644=0A= --- a/tools/testing/selftests/kvm/set_memory_region_test.c=0A= +++ b/tools/testing/selftests/kvm/set_memory_region_test.c=0A= @@ -602,6 +602,41 @@ static void test_mmio_during_vectoring(void)=0A= =0A= kvm_vm_free(vm);=0A= }=0A= +=0A= +static void guest_code_trigger_mmio(void)=0A= +{=0A= + /*=0A= + * Read some GPA that is not backed by a memslot. KVM consider this=0A= + * as MMIO and tell userspace to emulate the read.=0A= + */=0A= + READ_ONCE(*((uint64_t *)MEM_REGION_GPA));=0A= +=0A= + GUEST_DONE();=0A= +}=0A= +=0A= +static void test_guest_memfd_mmio(void)=0A= +{=0A= + struct kvm_vm *vm;=0A= + struct kvm_vcpu *vcpu;=0A= + struct vm_shape shape =3D {=0A= + .mode =3D VM_MODE_DEFAULT,=0A= + .src_type =3D VM_MEM_SRC_GUEST_MEMFD_NO_DIRECT_MAP,=0A= + };=0A= + pthread_t vcpu_thread;=0A= +=0A= + pr_info("Testing MMIO emulation for instructions in gmem\n");=0A= +=0A= + vm =3D __vm_create_shape_with_one_vcpu(shape, &vcpu, 0, guest_code_trigge= r_mmio);=0A= +=0A= + virt_map(vm, MEM_REGION_GPA, MEM_REGION_GPA, 1);=0A= +=0A= + pthread_create(&vcpu_thread, NULL, vcpu_worker, vcpu);=0A= +=0A= + /* If the MMIO read was successfully emulated, the vcpu thread will exit = */=0A= + pthread_join(vcpu_thread, NULL);=0A= +=0A= + kvm_vm_free(vm);=0A= +}=0A= #endif=0A= =0A= int main(int argc, char *argv[])=0A= @@ -625,10 +660,19 @@ int main(int argc, char *argv[])=0A= test_add_max_memory_regions();=0A= =0A= #ifdef __x86_64__=0A= - if (kvm_has_cap(KVM_CAP_GUEST_MEMFD) &&=0A= - (kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SW_PROTECTED_VM))) {= =0A= - test_add_private_memory_region();=0A= - test_add_overlapping_private_memory_regions();=0A= + if (kvm_has_cap(KVM_CAP_GUEST_MEMFD)) {=0A= + uint64_t valid_flags =3D kvm_check_cap(KVM_CAP_GUEST_MEMFD_FLAGS);=0A= +=0A= + if (kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SW_PROTECTED_VM)) {=0A= + test_add_private_memory_region();=0A= + test_add_overlapping_private_memory_regions();=0A= + }=0A= +=0A= + if ((valid_flags & GUEST_MEMFD_FLAG_MMAP)=0A= + && (valid_flags & GUEST_MEMFD_FLAG_NO_DIRECT_MAP))=0A= + test_guest_memfd_mmio();=0A= + else=0A= + pr_info("Skipping tests requiring GUEST_MEMFD_FLAG_MMAP | GUEST_MEMFD_F= LAG_NO_DIRECT_MAP");=0A= } else {=0A= pr_info("Skipping tests for KVM_MEM_GUEST_MEMFD memory regions\n");=0A= }=0A= -- =0A= 2.50.1=0A= =0A=