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bh=sniV4ADiqxDqLReNOG6JjHF4fkYiKMuydvXvoREL6Bs=; b=zau8v39nBp01WAQq6alJ19sPqOuwXSnY7WnMEFruDqsiO9z+Vp9pXyjeekwsWq8xTg38I6 bgmR1MXMjdExOYies9lcqIIhC6qTUerdxIS2FTlVPOSMtuR4OmK/SVA+XK12SNNc4p7RrJ CmttIeoVZbcfPc0TPs31i/PZ2jr1n1A= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1716491191; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=sniV4ADiqxDqLReNOG6JjHF4fkYiKMuydvXvoREL6Bs=; b=l33cmH4A5PczwiVR3Bdo9C2vUFTimb2dVa9Ix1m2nWP3IhRk8BTIyt8p9K8T1sIeP4J3Sz 4fcI2715YLvvvKCw== From: Fabiano Rosas To: qemu-devel@nongnu.org Cc: berrange@redhat.com, armbru@redhat.com, Peter Xu , Claudio Fontana , Jim Fehlig , Thomas Huth , Laurent Vivier , Paolo Bonzini Subject: [PATCH v2 15/18] tests/qtest/migration: Add a test for mapped-ram with passing of fds Date: Thu, 23 May 2024 16:05:45 -0300 Message-Id: <20240523190548.23977-16-farosas@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240523190548.23977-1-farosas@suse.de> References: <20240523190548.23977-1-farosas@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; 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charset="utf-8" Add a multifd test for mapped-ram with passing of fds into QEMU. This is how libvirt will consume the feature. There are a couple of details to the fdset mechanism: - multifd needs two distinct file descriptors (not duplicated with dup()) so it can enable O_DIRECT only on the channels that do aligned IO. The dup() system call creates file descriptors that share status flags, of which O_DIRECT is one. - the open() access mode flags used for the fds passed into QEMU need to match the flags QEMU uses to open the file. Currently O_WRONLY for src and O_RDONLY for dst. Note that fdset code goes under _WIN32 because fd passing is not supported on Windows. Signed-off-by: Fabiano Rosas Reviewed-by: Peter Xu --- tests/qtest/migration-test.c | 101 +++++++++++++++++++++++++++++++++-- 1 file changed, 98 insertions(+), 3 deletions(-) diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c index 37017ff2d5..5ced3b90c9 100644 --- a/tests/qtest/migration-test.c +++ b/tests/qtest/migration-test.c @@ -2047,11 +2047,18 @@ static void test_precopy_file(void) =20 #ifndef _WIN32 static void fdset_add_fds(QTestState *qts, const char *file, int flags, - int num_fds) + int num_fds, bool direct_io) { for (int i =3D 0; i < num_fds; i++) { int fd; =20 +#ifdef O_DIRECT + /* only secondary channels can use direct-io */ + if (direct_io && i !=3D 0) { + flags |=3D O_DIRECT; + } +#endif + fd =3D open(file, flags, 0660); assert(fd !=3D -1); =20 @@ -2065,8 +2072,8 @@ static void *file_offset_fdset_start_hook(QTestState = *from, QTestState *to) { g_autofree char *file =3D g_strdup_printf("%s/%s", tmpfs, FILE_TEST_FI= LENAME); =20 - fdset_add_fds(from, file, O_WRONLY, 1); - fdset_add_fds(to, file, O_RDONLY, 1); + fdset_add_fds(from, file, O_WRONLY, 1, false); + fdset_add_fds(to, file, O_RDONLY, 1, false); =20 return NULL; } @@ -2238,6 +2245,87 @@ static void test_multifd_file_mapped_ram_dio(void) test_file_common(&args, true); } =20 +#ifndef _WIN32 +static void multifd_mapped_ram_fdset_end(QTestState *from, QTestState *to, + void *opaque) +{ + QDict *resp; + QList *fdsets; + + /* + * Remove the fdsets after migration, otherwise a second migration + * would fail due fdset reuse. + */ + qtest_qmp_assert_success(from, "{'execute': 'remove-fd', " + "'arguments': { 'fdset-id': 1}}"); + + resp =3D qtest_qmp(from, "{'execute': 'query-fdsets', " + "'arguments': {}}"); + g_assert(qdict_haskey(resp, "return")); + fdsets =3D qdict_get_qlist(resp, "return"); + g_assert(fdsets && qlist_empty(fdsets)); +} + +static void *multifd_mapped_ram_fdset_dio(QTestState *from, QTestState *to) +{ + g_autofree char *file =3D g_strdup_printf("%s/%s", tmpfs, FILE_TEST_FI= LENAME); + + fdset_add_fds(from, file, O_WRONLY, 2, true); + fdset_add_fds(to, file, O_RDONLY, 2, true); + + migrate_multifd_mapped_ram_start(from, to); + migrate_set_parameter_bool(from, "direct-io", true); + migrate_set_parameter_bool(to, "direct-io", true); + + return NULL; +} + +static void *multifd_mapped_ram_fdset(QTestState *from, QTestState *to) +{ + g_autofree char *file =3D g_strdup_printf("%s/%s", tmpfs, FILE_TEST_FI= LENAME); + + fdset_add_fds(from, file, O_WRONLY, 2, false); + fdset_add_fds(to, file, O_RDONLY, 2, false); + + migrate_multifd_mapped_ram_start(from, to); + + return NULL; +} + +static void test_multifd_file_mapped_ram_fdset(void) +{ + g_autofree char *uri =3D g_strdup_printf("file:/dev/fdset/1,offset=3D%= d", + FILE_TEST_OFFSET); + MigrateCommon args =3D { + .connect_uri =3D uri, + .listen_uri =3D "defer", + .start_hook =3D multifd_mapped_ram_fdset, + .finish_hook =3D multifd_mapped_ram_fdset_end, + }; + + test_file_common(&args, true); +} + +static void test_multifd_file_mapped_ram_fdset_dio(void) +{ + g_autofree char *uri =3D g_strdup_printf("file:/dev/fdset/1,offset=3D%= d", + FILE_TEST_OFFSET); + MigrateCommon args =3D { + .connect_uri =3D uri, + .listen_uri =3D "defer", + .start_hook =3D multifd_mapped_ram_fdset_dio, + .finish_hook =3D multifd_mapped_ram_fdset_end, + }; + + if (!probe_o_direct_support(tmpfs)) { + g_test_skip("Filesystem does not support O_DIRECT"); + return; + } + + test_file_common(&args, true); +} +#endif /* !_WIN32 */ + static void test_precopy_tcp_plain(void) { MigrateCommon args =3D { @@ -3648,6 +3736,13 @@ int main(int argc, char **argv) migration_test_add("/migration/multifd/file/mapped-ram/dio", test_multifd_file_mapped_ram_dio); =20 +#ifndef _WIN32 + qtest_add_func("/migration/multifd/file/mapped-ram/fdset", + test_multifd_file_mapped_ram_fdset); + qtest_add_func("/migration/multifd/file/mapped-ram/fdset/dio", + test_multifd_file_mapped_ram_fdset_dio); +#endif + #ifdef CONFIG_GNUTLS migration_test_add("/migration/precopy/unix/tls/psk", test_precopy_unix_tls_psk); --=20 2.35.3