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Thu, 13 Feb 2020 21:17:29 +0000 (UTC) From: Juan Quintela To: qemu-devel@nongnu.org Subject: [PATCH v6 5/8] multifd: Add zlib compression multifd support Date: Thu, 13 Feb 2020 22:17:06 +0100 Message-Id: <20200213211709.59065-6-quintela@redhat.com> In-Reply-To: <20200213211709.59065-1-quintela@redhat.com> References: <20200213211709.59065-1-quintela@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: fh0h9WoBPUmTcUS0z9bbuw-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Laurent Vivier , Thomas Huth , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Eduardo Habkost , Juan Quintela , Markus Armbruster , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Paolo Bonzini , =?UTF-8?q?Alex=20Benn=C3=A9e?= , "Dr. David Alan Gilbert" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Juan Quintela Acked-by: Markus Armbruster --- hw/core/qdev-properties.c | 2 +- migration/Makefile.objs | 1 + migration/multifd-zlib.c | 325 +++++++++++++++++++++++++++++++++++ migration/multifd.c | 6 + migration/multifd.h | 4 + qapi/migration.json | 3 +- tests/qtest/migration-test.c | 6 + 7 files changed, 345 insertions(+), 2 deletions(-) create mode 100644 migration/multifd-zlib.c diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c index fa7edac020..db2a7abfb2 100644 --- a/hw/core/qdev-properties.c +++ b/hw/core/qdev-properties.c @@ -645,7 +645,7 @@ const PropertyInfo qdev_prop_fdc_drive_type =3D { const PropertyInfo qdev_prop_multifd_compression =3D { .name =3D "MultiFDCompression", .description =3D "multifd_compression values, " - "none", + "none/zlib", .enum_table =3D &MultiFDCompression_lookup, .get =3D get_enum, .set =3D set_enum, diff --git a/migration/Makefile.objs b/migration/Makefile.objs index d3623d5f9b..0308caa5c5 100644 --- a/migration/Makefile.objs +++ b/migration/Makefile.objs @@ -8,6 +8,7 @@ common-obj-y +=3D xbzrle.o postcopy-ram.o common-obj-y +=3D qjson.o common-obj-y +=3D block-dirty-bitmap.o common-obj-y +=3D multifd.o +common-obj-y +=3D multifd-zlib.o =20 common-obj-$(CONFIG_RDMA) +=3D rdma.o =20 diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c new file mode 100644 index 0000000000..ab4ba75d75 --- /dev/null +++ b/migration/multifd-zlib.c @@ -0,0 +1,325 @@ +/* + * Multifd zlib compression implementation + * + * Copyright (c) 2020 Red Hat Inc + * + * Authors: + * Juan Quintela + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include +#include "qemu/rcu.h" +#include "exec/target_page.h" +#include "qapi/error.h" +#include "migration.h" +#include "trace.h" +#include "multifd.h" + +struct zlib_data { + /* stream for compression */ + z_stream zs; + /* compressed buffer */ + uint8_t *zbuff; + /* size of compressed buffer */ + uint32_t zbuff_len; +}; + +/* Multifd zlib compression */ + +/** + * zlib_send_setup: setup send side + * + * Setup each channel with zlib compression. + * + * Returns 0 for success or -1 for error + * + * @p: Params for the channel that we are using + * @errp: pointer to an error + */ +static int zlib_send_setup(MultiFDSendParams *p, Error **errp) +{ + uint32_t page_count =3D MULTIFD_PACKET_SIZE / qemu_target_page_size(); + struct zlib_data *z =3D g_malloc0(sizeof(struct zlib_data)); + z_stream *zs =3D &z->zs; + + zs->zalloc =3D Z_NULL; + zs->zfree =3D Z_NULL; + zs->opaque =3D Z_NULL; + if (deflateInit(zs, migrate_multifd_zlib_level()) !=3D Z_OK) { + g_free(z); + error_setg(errp, "multifd %d: deflate init failed", p->id); + return -1; + } + /* We will never have more than page_count pages */ + z->zbuff_len =3D page_count * qemu_target_page_size(); + z->zbuff_len *=3D 2; + z->zbuff =3D g_try_malloc(z->zbuff_len); + if (!z->zbuff) { + deflateEnd(&z->zs); + g_free(z); + error_setg(errp, "multifd %d: out of memory for zbuff", p->id); + return -1; + } + p->data =3D z; + return 0; +} + +/** + * zlib_send_cleanup: cleanup send side + * + * Close the channel and return memory. + * + * @p: Params for the channel that we are using + */ +static void zlib_send_cleanup(MultiFDSendParams *p, Error **errp) +{ + struct zlib_data *z =3D p->data; + + deflateEnd(&z->zs); + g_free(z->zbuff); + z->zbuff =3D NULL; + g_free(p->data); + p->data =3D NULL; +} + +/** + * zlib_send_prepare: prepare date to be able to send + * + * Create a compressed buffer with all the pages that we are going to + * send. + * + * Returns 0 for success or -1 for error + * + * @p: Params for the channel that we are using + * @used: number of pages used + */ +static int zlib_send_prepare(MultiFDSendParams *p, uint32_t used, Error **= errp) +{ + struct iovec *iov =3D p->pages->iov; + struct zlib_data *z =3D p->data; + z_stream *zs =3D &z->zs; + uint32_t out_size =3D 0; + int ret; + uint32_t i; + + for (i =3D 0; i < used; i++) { + uint32_t available =3D z->zbuff_len - out_size; + int flush =3D Z_NO_FLUSH; + + if (i =3D=3D used - 1) { + flush =3D Z_SYNC_FLUSH; + } + + zs->avail_in =3D iov[i].iov_len; + zs->next_in =3D iov[i].iov_base; + + zs->avail_out =3D available; + zs->next_out =3D z->zbuff + out_size; + + /* + * Welcome to deflate semantics + * + * We need to loop while: + * - return is Z_OK + * - there are stuff to be compressed + * - there are output space free + */ + do { + ret =3D deflate(zs, flush); + } while (ret =3D=3D Z_OK && zs->avail_in && zs->avail_out); + if (ret =3D=3D Z_OK && zs->avail_in) { + error_setg(errp, "multifd %d: deflate failed to compress all i= nput", + p->id); + return -1; + } + if (ret !=3D Z_OK) { + error_setg(errp, "multifd %d: deflate returned %d instead of Z= _OK", + p->id, ret); + return -1; + } + out_size +=3D available - zs->avail_out; + } + p->next_packet_size =3D out_size; + p->flags |=3D MULTIFD_FLAG_ZLIB; + + return 0; +} + +/** + * zlib_send_write: do the actual write of the data + * + * Do the actual write of the comprresed buffer. + * + * Returns 0 for success or -1 for error + * + * @p: Params for the channel that we are using + * @used: number of pages used + * @errp: pointer to an error + */ +static int zlib_send_write(MultiFDSendParams *p, uint32_t used, Error **er= rp) +{ + struct zlib_data *z =3D p->data; + + return qio_channel_write_all(p->c, (void *)z->zbuff, p->next_packet_si= ze, + errp); +} + +/** + * zlib_recv_setup: setup receive side + * + * Create the compressed channel and buffer. + * + * Returns 0 for success or -1 for error + * + * @p: Params for the channel that we are using + * @errp: pointer to an error + */ +static int zlib_recv_setup(MultiFDRecvParams *p, Error **errp) +{ + uint32_t page_count =3D MULTIFD_PACKET_SIZE / qemu_target_page_size(); + struct zlib_data *z =3D g_malloc0(sizeof(struct zlib_data)); + z_stream *zs =3D &z->zs; + + p->data =3D z; + zs->zalloc =3D Z_NULL; + zs->zfree =3D Z_NULL; + zs->opaque =3D Z_NULL; + zs->avail_in =3D 0; + zs->next_in =3D Z_NULL; + if (inflateInit(zs) !=3D Z_OK) { + error_setg(errp, "multifd %d: inflate init failed", p->id); + return -1; + } + /* We will never have more than page_count pages */ + z->zbuff_len =3D page_count * qemu_target_page_size(); + /* We know compression "could" use more space */ + z->zbuff_len *=3D 2; + z->zbuff =3D g_try_malloc(z->zbuff_len); + if (!z->zbuff) { + inflateEnd(zs); + error_setg(errp, "multifd %d: out of memory for zbuff", p->id); + return -1; + } + return 0; +} + +/** + * zlib_recv_cleanup: setup receive side + * + * For no compression this function does nothing. + * + * @p: Params for the channel that we are using + */ +static void zlib_recv_cleanup(MultiFDRecvParams *p) +{ + struct zlib_data *z =3D p->data; + + inflateEnd(&z->zs); + g_free(z->zbuff); + z->zbuff =3D NULL; + g_free(p->data); + p->data =3D NULL; +} + +/** + * zlib_recv_pages: read the data from the channel into actual pages + * + * Read the compressed buffer, and uncompress it into the actual + * pages. + * + * Returns 0 for success or -1 for error + * + * @p: Params for the channel that we are using + * @used: number of pages used + * @errp: pointer to an error + */ +static int zlib_recv_pages(MultiFDRecvParams *p, uint32_t used, Error **er= rp) +{ + struct zlib_data *z =3D p->data; + z_stream *zs =3D &z->zs; + uint32_t in_size =3D p->next_packet_size; + /* we measure the change of total_out */ + uint32_t out_size =3D zs->total_out; + uint32_t expected_size =3D used * qemu_target_page_size(); + uint32_t flags =3D p->flags & MULTIFD_FLAG_COMPRESSION_MASK; + int ret; + int i; + + if (flags !=3D MULTIFD_FLAG_ZLIB) { + error_setg(errp, "multifd %d: flags received %x flags expected %x"= , + p->id, flags, MULTIFD_FLAG_ZLIB); + return -1; + } + ret =3D qio_channel_read_all(p->c, (void *)z->zbuff, in_size, errp); + + if (ret !=3D 0) { + return ret; + } + + zs->avail_in =3D in_size; + zs->next_in =3D z->zbuff; + + for (i =3D 0; i < used; i++) { + struct iovec *iov =3D &p->pages->iov[i]; + int flush =3D Z_NO_FLUSH; + unsigned long start =3D zs->total_out; + + if (i =3D=3D used - 1) { + flush =3D Z_SYNC_FLUSH; + } + + zs->avail_out =3D iov->iov_len; + zs->next_out =3D iov->iov_base; + + /* + * Welcome to inflate semantics + * + * We need to loop while: + * - return is Z_OK + * - there are input available + * - we haven't completed a full page + */ + do { + ret =3D inflate(zs, flush); + } while (ret =3D=3D Z_OK && zs->avail_in + && (zs->total_out - start) < iov->iov_len); + if (ret =3D=3D Z_OK && (zs->total_out - start) < iov->iov_len) { + error_setg(errp, "multifd %d: inflate generated too few output= ", + p->id); + return -1; + } + if (ret !=3D Z_OK) { + error_setg(errp, "multifd %d: inflate returned %d instead of Z= _OK", + p->id, ret); + return -1; + } + } + out_size =3D zs->total_out - out_size; + if (out_size !=3D expected_size) { + error_setg(errp, "multifd %d: packet size received %d size expecte= d %d", + p->id, out_size, expected_size); + return -1; + } + return 0; +} + +static MultiFDMethods multifd_zlib_ops =3D { + .send_setup =3D zlib_send_setup, + .send_cleanup =3D zlib_send_cleanup, + .send_prepare =3D zlib_send_prepare, + .send_write =3D zlib_send_write, + .recv_setup =3D zlib_recv_setup, + .recv_cleanup =3D zlib_recv_cleanup, + .recv_pages =3D zlib_recv_pages +}; + +static void multifd_zlib_register(void) +{ + multifd_register_ops(MULTIFD_COMPRESSION_ZLIB, &multifd_zlib_ops); +} + +migration_init(multifd_zlib_register); diff --git a/migration/multifd.c b/migration/multifd.c index 97433e5135..cb6a4a3ab8 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -166,6 +166,12 @@ static MultiFDMethods *multifd_ops[MULTIFD_COMPRESSION= __MAX] =3D { [MULTIFD_COMPRESSION_NONE] =3D &multifd_nocomp_ops, }; =20 +void multifd_register_ops(int method, MultiFDMethods *ops) +{ + assert(0 < method && method < MULTIFD_COMPRESSION__MAX); + multifd_ops[method] =3D ops; +} + static int multifd_send_initial_packet(MultiFDSendParams *p, Error **errp) { MultiFDInit_t msg =3D {}; diff --git a/migration/multifd.h b/migration/multifd.h index 54075ffa7d..c6dad7b990 100644 --- a/migration/multifd.h +++ b/migration/multifd.h @@ -23,12 +23,14 @@ void multifd_recv_sync_main(void); void multifd_send_sync_main(QEMUFile *f); int multifd_queue_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset); =20 +/* Multifd Compression flags */ #define MULTIFD_FLAG_SYNC (1 << 0) =20 /* We reserve 3 bits for compression methods */ #define MULTIFD_FLAG_COMPRESSION_MASK (7 << 1) /* we need to be compatible. Before compression value was 0 */ #define MULTIFD_FLAG_NOCOMP (0 << 1) +#define MULTIFD_FLAG_ZLIB (1 << 1) =20 /* This value needs to be a multiple of qemu_target_page_size() */ #define MULTIFD_PACKET_SIZE (512 * 1024) @@ -161,5 +163,7 @@ typedef struct { int (*recv_pages)(MultiFDRecvParams *p, uint32_t used, Error **errp); } MultiFDMethods; =20 +void multifd_register_ops(int method, MultiFDMethods *ops); + #endif =20 diff --git a/qapi/migration.json b/qapi/migration.json index 0845d926f2..860609231b 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -494,12 +494,13 @@ # An enumeration of multifd compression methods. # # @none: no compression. +# @zlib: use zlib compression method. # # Since: 5.0 # ## { 'enum': 'MultiFDCompression', - 'data': [ 'none' ] } + 'data': [ 'none', 'zlib' ] } =20 ## # @MigrationParameter: diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c index f84c157285..90c26e879f 100644 --- a/tests/qtest/migration-test.c +++ b/tests/qtest/migration-test.c @@ -1323,6 +1323,11 @@ static void test_multifd_tcp_none(void) test_multifd_tcp("none"); } =20 +static void test_multifd_tcp_zlib(void) +{ + test_multifd_tcp("zlib"); +} + /* * This test does: * source target @@ -1486,6 +1491,7 @@ int main(int argc, char **argv) qtest_add_func("/migration/auto_converge", test_migrate_auto_converge)= ; qtest_add_func("/migration/multifd/tcp/none", test_multifd_tcp_none); qtest_add_func("/migration/multifd/tcp/cancel", test_multifd_tcp_cance= l); + qtest_add_func("/migration/multifd/tcp/zlib", test_multifd_tcp_zlib); =20 ret =3D g_test_run(); =20 --=20 2.24.1