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Wed, 19 Nov 2025 09:29:26 -0800 (PST) X-Google-Smtp-Source: AGHT+IHdHSRxnSzvkY2AhBaph2YGKHOABMh41v1V1DQTAu5wWGg8/33DDdRSIXzXKE+omjl3bNwIQw== X-Received: by 2002:a05:620a:1724:b0:8b2:e1da:7532 with SMTP id af79cd13be357-8b327321202mr25672385a.34.1763573365774; Wed, 19 Nov 2025 09:29:25 -0800 (PST) From: Peter Xu To: qemu-devel@nongnu.org Cc: Paolo Bonzini , David Hildenbrand , Alexey Kardashevskiy , peterx@redhat.com, Chenyi Qiang , Juraj Marcin , Li Xiaoyao , Fabiano Rosas Subject: [PATCH v2 8/9] tests/migration-test: Support guest-memfd init shared mem type Date: Wed, 19 Nov 2025 12:29:12 -0500 Message-ID: <20251119172913.577392-9-peterx@redhat.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251119172913.577392-1-peterx@redhat.com> References: <20251119172913.577392-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1763573400588019100 Content-Type: text/plain; charset="utf-8" Support the guest-memfd type when the fd has init share enabled. It means the gmemfd can be used similarly to memfd. Signed-off-by: Peter Xu --- tests/qtest/migration/framework.h | 4 +++ tests/qtest/migration/framework.c | 60 +++++++++++++++++++++++++++++++ 2 files changed, 64 insertions(+) diff --git a/tests/qtest/migration/framework.h b/tests/qtest/migration/fram= ework.h index ed85ed502d..b4c5edcad3 100644 --- a/tests/qtest/migration/framework.h +++ b/tests/qtest/migration/framework.h @@ -34,6 +34,10 @@ typedef enum { * but only anonymously allocated. */ MEM_TYPE_MEMFD, + /* + * Use guest-memfd, shared mappings. + */ + MEM_TYPE_GUEST_MEMFD, MEM_TYPE_NUM, } MemType; =20 diff --git a/tests/qtest/migration/framework.c b/tests/qtest/migration/fram= ework.c index 81eae09c92..73536c8f29 100644 --- a/tests/qtest/migration/framework.c +++ b/tests/qtest/migration/framework.c @@ -26,6 +26,10 @@ #include "qemu/range.h" #include "qemu/sockets.h" =20 +#ifdef CONFIG_LINUX +#include +#include +#endif =20 #define QEMU_VM_FILE_MAGIC 0x5145564d #define QEMU_ENV_SRC "QTEST_QEMU_BINARY_SRC" @@ -279,6 +283,9 @@ static char *migrate_mem_type_get_opts(MemType type, co= nst char *memory_size) case MEM_TYPE_MEMFD: backend =3D g_strdup("-object memory-backend-memfd"); break; + case MEM_TYPE_GUEST_MEMFD: + backend =3D g_strdup("-object memory-backend-memfd,guest-memfd=3Do= n"); + break; case MEM_TYPE_ANON: backend =3D g_strdup("-object memory-backend-ram"); share =3D false; @@ -425,8 +432,55 @@ int migrate_args(char **from, char **to, const char *u= ri, MigrateStart *args) return 0; } =20 +static bool kvm_guest_memfd_init_shared_supported(const char **reason) +{ + assert(*reason =3D=3D NULL); + +#ifdef CONFIG_LINUX + int ret, fd =3D -1; + + if (!migration_get_env()->has_kvm) { + *reason =3D "KVM is not enabled in the current QEMU build"; + goto out; + } + + fd =3D open("/dev/kvm", O_RDWR); + if (fd < 0) { + *reason =3D "KVM module isn't available or missing permission"; + goto out; + } + + ret =3D ioctl(fd, KVM_CHECK_EXTENSION, KVM_CAP_GUEST_MEMFD); + if (!ret) { + *reason =3D "KVM module doesn't suport guest-memfd"; + goto out; + } + + ret =3D ioctl(fd, KVM_CHECK_EXTENSION, KVM_CAP_GUEST_MEMFD_FLAGS); + if (ret < 0) { + *reason =3D "KVM doesn't support KVM_CAP_GUEST_MEMFD_FLAGS"; + goto out; + } + + if (!(ret & GUEST_MEMFD_FLAG_INIT_SHARED)) { + *reason =3D "KVM doesn't support GUEST_MEMFD_FLAG_INIT_SHARED"; + goto out; + } +out: + if (fd >=3D 0) { + close(fd); + } +#else + *reason =3D "KVM not supported on non-Linux OS"; +#endif + + return !*reason; +} + static bool migrate_mem_type_prepare(MemType type) { + const char *reason =3D NULL; + switch (type) { case MEM_TYPE_SHMEM: if (!g_file_test("/dev/shm", G_FILE_TEST_IS_DIR)) { @@ -434,6 +488,12 @@ static bool migrate_mem_type_prepare(MemType type) return false; } break; + case MEM_TYPE_GUEST_MEMFD: + if (!kvm_guest_memfd_init_shared_supported(&reason)) { + g_test_skip(reason); + return false; + } + break; default: break; } --=20 2.50.1