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Wed, 19 Nov 2025 07:49:33 -0800 (PST) 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, xmarcalx@amazon.co.uk, kalyazin@amazon.co.uk, jackabt@amazon.com Subject: [PATCH v3 2/3] KVM: selftests: Enable pre_fault_memory_test for arm64 Date: Wed, 19 Nov 2025 15:49:09 +0000 Message-ID: <20251119154910.97716-3-jackabt.amazon@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251119154910.97716-1-jackabt.amazon@gmail.com> References: <20251119154910.97716-1-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: 8bit From: Jack Thomson Enable the pre_fault_memory_test to run on arm64 by making it work with different guest page sizes and testing multiple guest configurations. Update the test_assert to compare against the UCALL_EXIT_REASON, for portability, as arm64 exits with KVM_EXIT_MMIO while x86 uses KVM_EXIT_IO. Signed-off-by: Jack Thomson --- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../selftests/kvm/pre_fault_memory_test.c | 78 ++++++++++++++----- 2 files changed, 58 insertions(+), 21 deletions(-) diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index 148d427ff24b..0ddd8db60197 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -183,6 +183,7 @@ TEST_GEN_PROGS_arm64 += memslot_perf_test TEST_GEN_PROGS_arm64 += mmu_stress_test TEST_GEN_PROGS_arm64 += rseq_test TEST_GEN_PROGS_arm64 += steal_time +TEST_GEN_PROGS_arm64 += pre_fault_memory_test TEST_GEN_PROGS_s390 = $(TEST_GEN_PROGS_COMMON) TEST_GEN_PROGS_s390 += s390/memop diff --git a/tools/testing/selftests/kvm/pre_fault_memory_test.c b/tools/testing/selftests/kvm/pre_fault_memory_test.c index f04768c1d2e4..674931e7bb3a 100644 --- a/tools/testing/selftests/kvm/pre_fault_memory_test.c +++ b/tools/testing/selftests/kvm/pre_fault_memory_test.c @@ -11,19 +11,29 @@ #include #include #include +#include /* Arbitrarily chosen values */ -#define TEST_SIZE (SZ_2M + PAGE_SIZE) -#define TEST_NPAGES (TEST_SIZE / PAGE_SIZE) +#define TEST_BASE_SIZE SZ_2M #define TEST_SLOT 10 +/* Storage of test info to share with guest code */ +struct test_config { + int page_size; + uint64_t test_size; + uint64_t test_num_pages; +}; + +struct test_config test_config; + static void guest_code(uint64_t base_gpa) { volatile uint64_t val __used; + struct test_config *config = &test_config; int i; - for (i = 0; i < TEST_NPAGES; i++) { - uint64_t *src = (uint64_t *)(base_gpa + i * PAGE_SIZE); + for (i = 0; i < config->test_num_pages; i++) { + uint64_t *src = (uint64_t *)(base_gpa + i * config->page_size); val = *src; } @@ -159,11 +169,17 @@ static void pre_fault_memory(struct kvm_vcpu *vcpu, u64 base_gpa, u64 offset, KVM_PRE_FAULT_MEMORY, ret, vcpu->vm); } -static void __test_pre_fault_memory(unsigned long vm_type, bool private) +struct test_params { + unsigned long vm_type; + bool private; +}; + +static void __test_pre_fault_memory(enum vm_guest_mode guest_mode, void *arg) { + struct test_params *p = arg; const struct vm_shape shape = { - .mode = VM_MODE_DEFAULT, - .type = vm_type, + .mode = guest_mode, + .type = p->vm_type, }; struct kvm_vcpu *vcpu; struct kvm_run *run; @@ -174,10 +190,17 @@ static void __test_pre_fault_memory(unsigned long vm_type, bool private) uint64_t guest_test_virt_mem; uint64_t alignment, guest_page_size; + pr_info("Testing guest mode: %s\n", vm_guest_mode_string(guest_mode)); + vm = vm_create_shape_with_one_vcpu(shape, &vcpu, guest_code); - alignment = guest_page_size = vm_guest_mode_params[VM_MODE_DEFAULT].page_size; - guest_test_phys_mem = (vm->max_gfn - TEST_NPAGES) * guest_page_size; + guest_page_size = vm_guest_mode_params[guest_mode].page_size; + + test_config.page_size = guest_page_size; + test_config.test_size = TEST_BASE_SIZE + test_config.page_size; + test_config.test_num_pages = vm_calc_num_guest_pages(vm->mode, test_config.test_size); + + guest_test_phys_mem = (vm->max_gfn - test_config.test_num_pages) * test_config.page_size; #ifdef __s390x__ alignment = max(0x100000UL, guest_page_size); #else @@ -187,23 +210,31 @@ static void __test_pre_fault_memory(unsigned long vm_type, bool private) guest_test_virt_mem = guest_test_phys_mem & ((1ULL << (vm->va_bits - 1)) - 1); vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, - guest_test_phys_mem, TEST_SLOT, TEST_NPAGES, - private ? KVM_MEM_GUEST_MEMFD : 0); - virt_map(vm, guest_test_virt_mem, guest_test_phys_mem, TEST_NPAGES); + 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_num_pages); + + if (p->private) + vm_mem_set_private(vm, guest_test_phys_mem, test_config.test_size); + pre_fault_memory(vcpu, guest_test_phys_mem, TEST_BASE_SIZE, 0, p->private); + /* Test pre-faulting over an already faulted range */ + pre_fault_memory(vcpu, guest_test_phys_mem, TEST_BASE_SIZE, 0, p->private); + pre_fault_memory(vcpu, guest_test_phys_mem + TEST_BASE_SIZE, + test_config.page_size * 2, test_config.page_size, p->private); + pre_fault_memory(vcpu, guest_test_phys_mem + test_config.test_size, + test_config.page_size, test_config.page_size, p->private); - if (private) - vm_mem_set_private(vm, guest_test_phys_mem, TEST_SIZE); + vcpu_args_set(vcpu, 1, guest_test_virt_mem); - pre_fault_memory(vcpu, guest_test_phys_mem, 0, SZ_2M, 0, private); - pre_fault_memory(vcpu, guest_test_phys_mem, SZ_2M, PAGE_SIZE * 2, PAGE_SIZE, private); - pre_fault_memory(vcpu, guest_test_phys_mem, TEST_SIZE, PAGE_SIZE, PAGE_SIZE, private); + /* Export the shared variables to the guest. */ + sync_global_to_guest(vm, test_config); - vcpu_args_set(vcpu, 1, guest_test_virt_mem); vcpu_run(vcpu); run = vcpu->run; - TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, - "Wanted KVM_EXIT_IO, got exit reason: %u (%s)", + TEST_ASSERT(run->exit_reason == UCALL_EXIT_REASON, + "Wanted %s, got exit reason: %u (%s)", + exit_reason_str(UCALL_EXIT_REASON), run->exit_reason, exit_reason_str(run->exit_reason)); switch (get_ucall(vcpu, &uc)) { @@ -227,7 +258,12 @@ static void test_pre_fault_memory(unsigned long vm_type, bool private) return; } - __test_pre_fault_memory(vm_type, private); + struct test_params p = { + .vm_type = vm_type, + .private = private, + }; + + for_each_guest_mode(__test_pre_fault_memory, &p); } int main(int argc, char *argv[]) -- 2.43.0