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Mon, 13 Oct 2025 08:15:46 -0700 (PDT) From: Jack Thomson To: maz@kernel.org, oliver.upton@linux.dev, pbonzini@redhat.com Cc: joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, shuah@kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, isaku.yamahata@intel.com, roypat@amazon.co.uk, kalyazin@amazon.co.uk, jackabt@amazon.com Subject: [PATCH v2 4/4] KVM: selftests: Add option for different backing in pre-fault tests Date: Mon, 13 Oct 2025 16:15:01 +0100 Message-ID: <20251013151502.6679-5-jackabt.amazon@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251013151502.6679-1-jackabt.amazon@gmail.com> References: <20251013151502.6679-1-jackabt.amazon@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Jack Thomson Add a -m option to specify different memory backing types for the pre-fault tests (e.g., anonymous, hugetlb), allowing testing of the pre-fault functionality across different memory configurations. Signed-off-by: Jack Thomson --- .../selftests/kvm/pre_fault_memory_test.c | 31 ++++++++++++++++--- 1 file changed, 26 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/kvm/pre_fault_memory_test.c b/tools/te= sting/selftests/kvm/pre_fault_memory_test.c index ed9848a8af60..22e2e53945d9 100644 --- a/tools/testing/selftests/kvm/pre_fault_memory_test.c +++ b/tools/testing/selftests/kvm/pre_fault_memory_test.c @@ -76,6 +76,7 @@ static void pre_fault_memory(struct kvm_vcpu *vcpu, u64 g= pa, u64 size, struct test_params { unsigned long vm_type; bool private; + enum vm_mem_backing_src_type mem_backing_src; }; =20 static void __test_pre_fault_memory(enum vm_guest_mode guest_mode, void *a= rg) @@ -94,7 +95,11 @@ static void __test_pre_fault_memory(enum vm_guest_mode g= uest_mode, void *arg) uint64_t guest_test_virt_mem; uint64_t alignment, guest_page_size; =20 + size_t backing_src_pagesz =3D get_backing_src_pagesz(p->mem_backing_src); + pr_info("Testing guest mode: %s\n", vm_guest_mode_string(guest_mode)); + pr_info("Testing memory backing src type: %s\n", + vm_mem_backing_src_alias(p->mem_backing_src)->name); =20 vm =3D vm_create_shape_with_one_vcpu(shape, &vcpu, guest_code); =20 @@ -110,10 +115,11 @@ static void __test_pre_fault_memory(enum vm_guest_mod= e guest_mode, void *arg) #else alignment =3D SZ_2M; #endif + alignment =3D max(alignment, backing_src_pagesz); guest_test_phys_mem =3D align_down(guest_test_phys_mem, alignment); guest_test_virt_mem =3D guest_test_phys_mem & ((1ULL << (vm->va_bits - 1)= ) - 1); =20 - vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, + vm_userspace_mem_region_add(vm, p->mem_backing_src, guest_test_phys_mem, TEST_SLOT, test_config.test_num_pages, p->private ? KVM_MEM_GUEST_MEMFD : 0); virt_map(vm, guest_test_virt_mem, guest_test_phys_mem, test_config.test_n= um_pages); @@ -155,7 +161,8 @@ static void __test_pre_fault_memory(enum vm_guest_mode = guest_mode, void *arg) kvm_vm_free(vm); } =20 -static void test_pre_fault_memory(unsigned long vm_type, bool private) +static void test_pre_fault_memory(unsigned long vm_type, enum vm_mem_backi= ng_src_type backing_src, + bool private) { if (vm_type && !(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(vm_type))) { pr_info("Skipping tests for vm_type 0x%lx\n", vm_type); @@ -165,6 +172,7 @@ static void test_pre_fault_memory(unsigned long vm_type= , bool private) struct test_params p =3D { .vm_type =3D vm_type, .private =3D private, + .mem_backing_src =3D backing_src, }; =20 for_each_guest_mode(__test_pre_fault_memory, &p); @@ -174,10 +182,23 @@ int main(int argc, char *argv[]) { TEST_REQUIRE(kvm_check_cap(KVM_CAP_PRE_FAULT_MEMORY)); =20 - test_pre_fault_memory(0, false); + int opt; + enum vm_mem_backing_src_type backing =3D VM_MEM_SRC_ANONYMOUS; + + while ((opt =3D getopt(argc, argv, "m:")) !=3D -1) { + switch (opt) { + case 'm': + backing =3D parse_backing_src_type(optarg); + break; + default: + break; + } + } + + test_pre_fault_memory(0, backing, false); #ifdef __x86_64__ - test_pre_fault_memory(KVM_X86_SW_PROTECTED_VM, false); - test_pre_fault_memory(KVM_X86_SW_PROTECTED_VM, true); + test_pre_fault_memory(KVM_X86_SW_PROTECTED_VM, backing, false); + test_pre_fault_memory(KVM_X86_SW_PROTECTED_VM, backing, true); #endif return 0; } --=20 2.43.0