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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: DE14F1C000C X-Stat-Signature: egki8ex5b1kp7qzige8gg15yg13hje3o X-HE-Tag: 1758727384-967261 X-HE-Meta: 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 mZzk0/Yy 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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: 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= ---=0A= .../selftests/kvm/set_memory_region_test.c | 50 +++++++++++++++++--=0A= 1 file changed, 46 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 ce3ac0fd6dfb..cb3bc642d376 100644=0A= --- a/tools/testing/selftests/kvm/set_memory_region_test.c=0A= +++ b/tools/testing/selftests/kvm/set_memory_region_test.c=0A= @@ -603,6 +603,41 @@ 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= @@ -626,10 +661,17 @@ 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= + 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 (kvm_has_cap(KVM_CAP_GUEST_MEMFD_MMAP) &&=0A= + kvm_has_cap(KVM_CAP_GUEST_MEMFD_NO_DIRECT_MAP))=0A= + test_guest_memfd_mmio();=0A= + else=0A= + pr_info("Skipping tests requiring KVM_CAP_GUEST_MEMFD_MMAP | KVM_CAP_GU= EST_MEMFD_NO_DIRECT_MAP");=0A= } else {=0A= pr_info("Skipping tests for KVM_MEM_GUEST_MEMFD memory regions\n");=0A= }=0A= -- =0A= 2.51.0=0A= =0A=