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Mon, 17 Aug 2026 01:08:04 -0700 (PDT) From: Like Xu X-Google-Original-From: Like Xu To: Marc Zyngier , Oliver Upton Cc: kvmarm@lists.linux.dev, Paolo Bonzini , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] KVM: selftests: arm64: Skip sea_to_user without 1GB hugepages Date: Mon, 17 Aug 2026 16:07:59 +0800 Message-ID: <20260817080759.25601-1-likexu@tencent.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit sea_to_user backs guest memory with 1GB hugepages but never checks any are reserved, aborting instead of skipping when the host has none: kvm_syscalls.h:68: mem != MAP_FAILED, errno=12 (ENOMEM) not ok 1 selftests: kvm: sea_to_user # exit=254 Check for enough free hugepages up front so the test skips cleanly. Signed-off-by: Like Xu --- tools/testing/selftests/kvm/arm64/sea_to_user.c | 6 ++++++ tools/testing/selftests/kvm/include/test_util.h | 1 + tools/testing/selftests/kvm/lib/test_util.c | 15 +++++++++++++++ 3 files changed, 22 insertions(+) diff --git a/tools/testing/selftests/kvm/arm64/sea_to_user.c b/tools/testing/selftests/kvm/arm64/sea_to_user.c index e96d8982c28b8..fc4f81702d0b6 100644 --- a/tools/testing/selftests/kvm/arm64/sea_to_user.c +++ b/tools/testing/selftests/kvm/arm64/sea_to_user.c @@ -260,6 +260,12 @@ static struct kvm_vm *vm_create_with_sea_handler(struct kvm_vcpu **vcpu) alignment = max(backing_page_size, guest_page_size); num_guest_pages = VM_MEM_SIZE / guest_page_size; + /* + * The region is backed by 1GB hugepages; skip gracefully rather than + * failing with mmap() -ENOMEM if the host has none reserved. + */ + TEST_REQUIRE(get_free_hugepages(backing_page_size) >= VM_MEM_SIZE); + vm = __vm_create_with_one_vcpu(vcpu, num_guest_pages, guest_code); vm_init_descriptor_tables(vm); vcpu_init_descriptor_tables(*vcpu); diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h index a56271c237ae9..0624922c2735d 100644 --- a/tools/testing/selftests/kvm/include/test_util.h +++ b/tools/testing/selftests/kvm/include/test_util.h @@ -168,6 +168,7 @@ struct vm_mem_backing_src_alias { bool thp_configured(void); size_t get_trans_hugepagesz(void); size_t get_def_hugetlb_pagesz(void); +size_t get_free_hugepages(size_t page_size); const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(u32 i); size_t get_backing_src_pagesz(u32 i); bool is_backing_src_hugetlb(u32 i); diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c index bab1bd2b775b6..29f9c1d60b1b7 100644 --- a/tools/testing/selftests/kvm/lib/test_util.c +++ b/tools/testing/selftests/kvm/lib/test_util.c @@ -222,6 +222,21 @@ size_t get_def_hugetlb_pagesz(void) TEST_FAIL("Error in reading /proc/meminfo"); } +size_t get_free_hugepages(size_t page_size) +{ + char path[128]; + size_t free; + + snprintf(path, sizeof(path), + "/sys/kernel/mm/hugepages/hugepages-%zukB/free_hugepages", + page_size >> 10); + if (!test_sysfs_path(path)) + return 0; + + free = get_sysfs_val(path); + return free * page_size; +} + #define ANON_FLAGS (MAP_PRIVATE | MAP_ANONYMOUS) #define ANON_HUGE_FLAGS (ANON_FLAGS | MAP_HUGETLB) -- 2.43.7