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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 3BA5E40016 X-Stat-Signature: zxacmkpjd7ii1yz6h8c99qxf69tsgrmp X-Rspam-User: X-HE-Tag: 1773756829-548301 X-HE-Meta: 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 MVqQjBVj 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 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..cb445d420e8c 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=