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AJvYcCUwNZMCDkEgBJwa1nRzfoOFSTFSucABfra1QKio69TvdL/0LvfpPtn/58B18X42bSHonMqWX5xDcQ==@kvack.org X-Gm-Message-State: AOJu0YzVG3vT/NxpiVwt5X7u2XqSKwTogAyRq2Etx2znl47GlYqgM/QH 6HBLZ9gmBtsAKw9Nxb8xbasASzIP5QjBNn5403po3/yzR03bryMdBgQd7Tz6dfBUs56OaA4gnxF 4KeVdnQ== X-Received: from plbks8.prod.google.com ([2002:a17:903:848:b0:2b0:52e8:584]) (user=wyihan job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:2f84:b0:2b0:4b3a:9b4b with SMTP id d9443c01a7336-2b0826e3368mr7472585ad.16.1773963066002; Thu, 19 Mar 2026 16:31:06 -0700 (PDT) Date: Thu, 19 Mar 2026 23:30:34 +0000 In-Reply-To: <20260319-memory-failure-mf-delayed-fix-rfc-v2-v2-0-92c596402a7a@google.com> Mime-Version: 1.0 References: <20260319-memory-failure-mf-delayed-fix-rfc-v2-v2-0-92c596402a7a@google.com> X-Developer-Key: i=wyihan@google.com; a=ed25519; pk=cRi0fKzS5BMxlHyHY2pJv3w/1zcgfYKr6EYGYppdMYc= X-Developer-Signature: v=1; a=ed25519-sha256; t=1773963053; l=2809; i=wyihan@google.com; s=20260319; h=from:subject:message-id; bh=wltySrG4vozgVjDjb43L2B3dD6dgSygZ1tpNGMuiOvU=; b=MzayBc1lrUG8AtictP2UDRMFjSP2+93iY+nziVK024vQNTr5SivQhuoSDPM9eVFFuI+tPuw4N h7fKV+BGoAJDypYm6vtelBw4anbbG1sxuJC+lRnOm/wX8wAEripkYXw X-Mailer: b4 0.14.3 Message-ID: <20260319-memory-failure-mf-delayed-fix-rfc-v2-v2-7-92c596402a7a@google.com> Subject: [PATCH RFC v2 7/7] KVM: selftests: Test guest_memfd behavior with respect to stage 2 page tables From: Lisa Wang To: Miaohe Lin , Naoya Horiguchi , Andrew Morton , Paolo Bonzini , Shuah Khan , Hugh Dickins , Baolin Wang , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: rientjes@google.com, seanjc@google.com, ackerleytng@google.com, vannapurve@google.com, michael.roth@amd.com, jiaqiyan@google.com, tabba@google.com, dave.hansen@linux.intel.com, Lisa Wang Content-Type: text/plain; charset="utf-8" X-Rspamd-Queue-Id: 65ED8100004 X-Stat-Signature: rmwawstiznpxu3mmc7sw8bnw1hm9mzz1 X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1773963067-578078 X-HE-Meta: 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 E68U9Uw+ jJajJI17eWximJzbRY1de5q1al2dBZnJKSlcHY11/BGD9HEygqlZCVf8KrQputnppYTAPk3y0+EoQ/sJhfmQl74dMPAgG1D1blNfd49uYJbQDktBJHIwcpQGn8jtihZ3Zz6zBYuYeO43dJrH0KM/DG00b5wMyXOhh2jEEnHuObkc4pjZOQTqXcoxgTHTe7uMbXayYU0oCaC2E0DEicMpZne7Hb2gBajadZKnhe5wgWRBvn8TiCawQE9c51xoEnviL2ovx4i5Ij95IqZUSNJ7SCXoOILY3emzru4JKi54Me44sl3XnJXSpJagNC+Zx16VLKPW16XNYrhd1xUgn6xOEVM0J0p7sTKn1oDzQWzXGn3Xqeuv0nxRShvbR5tB0DKsMLsN20qMuPGVcQIQzjYIztl8+IIyCgcxsq0xtiJDuSM1C3fnnVnPbeY69E4u5cvzh+wDkX6FIyCxaPNHgZgGg1lMVwg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Test that + memory failure handling results in unmapping of bad memory from stage 2 page tables, hence requiring faulting on next guest access + when the guest tries to fault a poisoned page from guest_memfd, the userspace VMM informed with EHWPOISON Co-developed-by: Ackerley Tng Signed-off-by: Ackerley Tng Signed-off-by: Lisa Wang --- tools/testing/selftests/kvm/guest_memfd_test.c | 65 ++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index 445e8155ee1e..50907875dc43 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -637,6 +637,70 @@ static void test_guest_memfd_guest(void) kvm_vm_free(vm); } +static void __guest_code_read(uint8_t *mem) +{ + READ_ONCE(*mem); + GUEST_SYNC(0); + READ_ONCE(*mem); + GUEST_DONE(); +} + +static void guest_read(struct kvm_vcpu *vcpu, uint64_t gpa, int expected_errno) +{ + vcpu_args_set(vcpu, 1, gpa); + + if (expected_errno) { + TEST_ASSERT_EQ(_vcpu_run(vcpu), -1); + TEST_ASSERT_EQ(errno, expected_errno); + } else { + vcpu_run(vcpu); + TEST_ASSERT_EQ(get_ucall(vcpu, NULL), UCALL_SYNC); + } +} + +static void test_memory_failure_guest(void) +{ + const uint64_t gpa = SZ_4G; + const int slot = 1; + + unsigned long memory_failure_pfn; + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + uint8_t *mem; + size_t size; + int fd; + + if (!kvm_has_cap(KVM_CAP_GUEST_MEMFD_FLAGS)) + return; + + vm = __vm_create_shape_with_one_vcpu(VM_SHAPE_DEFAULT, &vcpu, 1, __guest_code_read); + + size = vm->page_size; + fd = vm_create_guest_memfd(vm, size, GUEST_MEMFD_FLAG_MMAP | GUEST_MEMFD_FLAG_INIT_SHARED); + vm_set_user_memory_region2(vm, slot, KVM_MEM_GUEST_MEMFD, gpa, size, NULL, fd, 0); + + mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + TEST_ASSERT(mem != MAP_FAILED, "mmap() for guest_memfd should succeed."); + virt_pg_map(vm, gpa, gpa); + + /* Fault in page to read pfn, then unmap page for testing. */ + READ_ONCE(*mem); + memory_failure_pfn = addr_to_pfn(mem); + munmap(mem, size); + + /* Fault page into stage2 page tables. */ + guest_read(vcpu, gpa, 0); + + mark_memory_failure(memory_failure_pfn, 0); + + guest_read(vcpu, gpa, EHWPOISON); + + close(fd); + kvm_vm_free(vm); + + unmark_memory_failure(memory_failure_pfn, 0); +} + int main(int argc, char *argv[]) { unsigned long vm_types, vm_type; @@ -657,4 +721,5 @@ int main(int argc, char *argv[]) test_guest_memfd(vm_type); test_guest_memfd_guest(); + test_memory_failure_guest(); } -- 2.53.0.959.g497ff81fa9-goog