Message ID | 20200123115831.36842-20-quintela@redhat.com |
---|---|
State | New |
Headers | show |
Series | Multifd Migration Compression | expand |
* Juan Quintela (quintela@redhat.com) wrote: > Signed-off-by: Juan Quintela <quintela@redhat.com> > --- > hw/core/qdev-properties.c | 2 +- > migration/Makefile.objs | 1 + > migration/multifd-zlib.c | 289 +++++++++++++++++++++++++++++++++++ > migration/multifd.c | 6 + > migration/multifd.h | 4 + > qapi/migration.json | 2 +- > tests/qtest/migration-test.c | 6 + > 7 files changed, 308 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 ff6a752b19..07ec75d8e3 100644 > --- a/hw/core/qdev-properties.c > +++ b/hw/core/qdev-properties.c > @@ -647,7 +647,7 @@ const PropertyInfo qdev_prop_fdc_drive_type = { > const PropertyInfo qdev_prop_multifd_compress = { > .name = "MultifdCompress", > .description = "multifd_compress values, " > - "none", > + "none/zlib", > .enum_table = &MultifdCompress_lookup, > .get = get_enum, > .set = 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 += xbzrle.o postcopy-ram.o > common-obj-y += qjson.o > common-obj-y += block-dirty-bitmap.o > common-obj-y += multifd.o > +common-obj-y += multifd-zlib.o > > common-obj-$(CONFIG_RDMA) += rdma.o > > diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c > new file mode 100644 > index 0000000000..33d7ee6741 > --- /dev/null > +++ b/migration/multifd-zlib.c > @@ -0,0 +1,289 @@ > +/* > + * Multifd zlib compression implementation > + * > + * Copyright (c) 2020 Red Hat Inc > + * > + * Authors: > + * Juan Quintela <quintela@redhat.com> > + * > + * This work is licensed under the terms of the GNU GPL, version 2 or later. > + * See the COPYING file in the top-level directory. > + */ > + > +#include "qemu/osdep.h" > +#include <zlib.h> > +#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 = MULTIFD_PACKET_SIZE / qemu_target_page_size(); > + struct zlib_data *z = g_malloc0(sizeof(struct zlib_data)); > + z_stream *zs = &z->zs; > + > + p->data = z; > + zs->zalloc = Z_NULL; > + zs->zfree = Z_NULL; > + zs->opaque = Z_NULL; > + if (deflateInit(zs, migrate_compress_level()) != 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 = page_count * qemu_target_page_size(); > + z->zbuff_len *= 2; > + z->zbuff = g_try_malloc(z->zbuff_len); > + if (!z->zbuff) { Does a deflateEnd need to be called here? > + g_free(z); > + error_setg(errp, "multifd %d: out of memory for zbuff", p->id); > + return -1; > + } > + return 0; I'd like to understand more aobut the failure path - lets say we exit through one of those return -1's, p->data is still set to point to z which is now been free'd. Will zlib_send_cleanup get called? Maybe it's safer to move the 'p->data = z' to right at the bottom before the 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 = p->data; As previously asked above, could this ever get called if zlib_send_setup has failed? If so does this need to check for !z ? > + deflateEnd(&z->zs); > + g_free(z->zbuff); > + z->zbuff = NULL; > + g_free(p->data); > + p->data = 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 = p->pages->iov; > + struct zlib_data *z = p->data; > + z_stream *zs = &z->zs; > + uint32_t out_size = 0; > + int ret; > + uint32_t i; > + > + for (i = 0; i < used; i++) { > + uint32_t available = z->zbuff_len - out_size; > + int flush = Z_NO_FLUSH; > + > + if (i == used - 1) { Odd double space formatting there. > + flush = Z_SYNC_FLUSH; > + } > + > + zs->avail_in = iov[i].iov_len; > + zs->next_in = iov[i].iov_base; > + > + zs->avail_out = available; > + zs->next_out = z->zbuff + out_size; > + > + ret = deflate(zs, flush); > + if (ret != Z_OK) { > + error_setg(errp, "multifd %d: deflate returned %d instead of Z_OK", > + p->id, ret); > + return -1; > + } > + out_size += available - zs->avail_out; > + } > + p->next_packet_size = out_size; > + p->flags |= 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 **errp) > +{ > + struct zlib_data *z = p->data; > + > + return qio_channel_write_all(p->c, (void *)z->zbuff, p->next_packet_size, > + 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 = MULTIFD_PACKET_SIZE / qemu_target_page_size(); > + struct zlib_data *z = g_malloc0(sizeof(struct zlib_data)); > + z_stream *zs = &z->zs; > + > + p->data = z; > + zs->zalloc = Z_NULL; > + zs->zfree = Z_NULL; > + zs->opaque = Z_NULL; > + zs->avail_in = 0; > + zs->next_in = Z_NULL; > + if (inflateInit(zs) != 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 = page_count * qemu_target_page_size(); > + /* We know compression "could" use more space */ > + z->zbuff_len *= 2; > + z->zbuff = g_try_malloc(z->zbuff_len); > + if (!z->zbuff) { inflateEnd and similar question to save? > + 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 = p->data; > + > + inflateEnd(&z->zs); > + g_free(z->zbuff); > + z->zbuff = NULL; > + g_free(p->data); > + p->data = 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 **errp) > +{ > + uint32_t in_size = p->next_packet_size; > + uint32_t out_size = 0; > + uint32_t expected_size = used * qemu_target_page_size(); > + struct zlib_data *z = p->data; > + z_stream *zs = &z->zs; > + int ret; > + int i; > + > + if (p->flags != MULTIFD_FLAG_ZLIB) { > + error_setg(errp, "multifd %d: flags received %x flags expected %x", > + p->id, MULTIFD_FLAG_ZLIB, p->flags); > + return -1; > + } > + ret = qio_channel_read_all(p->c, (void *)z->zbuff, in_size, errp); > + > + if (ret != 0) { > + return ret; > + } > + > + zs->avail_in = in_size; > + zs->next_in = z->zbuff; > + > + for (i = 0; i < used; i++) { > + struct iovec *iov = &p->pages->iov[i]; > + int flush = Z_NO_FLUSH; > + > + if (i == used - 1) { > + flush = Z_SYNC_FLUSH; > + } > + > + zs->avail_out = iov->iov_len; > + zs->next_out = iov->iov_base; > + > + ret = inflate(zs, flush); > + if (ret != Z_OK) { > + error_setg(errp, "multifd %d: inflate returned %d instead of Z_OK", > + p->id, ret); > + return ret; > + } > + out_size += iov->iov_len; How do we know that's iov_len ? > + } > + if (out_size != expected_size) { > + error_setg(errp, "multifd %d: packet size received %d size expected %d", > + p->id, out_size, expected_size); > + return -1; > + } > + return 0; > +} > + > +static MultiFDMethods multifd_zlib_ops = { > + .send_setup = zlib_send_setup, > + .send_cleanup = zlib_send_cleanup, > + .send_prepare = zlib_send_prepare, > + .send_write = zlib_send_write, > + .recv_setup = zlib_recv_setup, > + .recv_cleanup = zlib_recv_cleanup, > + .recv_pages = zlib_recv_pages > +}; > + > +static void multifd_zlib_register(void) > +{ > + multifd_register_ops(MULTIFD_COMPRESS_ZLIB, &multifd_zlib_ops); > +} > + > +migration_init(multifd_zlib_register); > diff --git a/migration/multifd.c b/migration/multifd.c > index 353140cd25..a1fc451d49 100644 > --- a/migration/multifd.c > +++ b/migration/multifd.c > @@ -164,6 +164,12 @@ static MultiFDMethods *multifd_ops[MULTIFD_COMPRESS__MAX] = { > [MULTIFD_COMPRESS_NONE] = &multifd_nocomp_ops, > }; > > +void multifd_register_ops(int method, MultiFDMethods *ops) > +{ > + assert(0 < method && method < MULTIFD_COMPRESS__MAX); > + multifd_ops[method] = ops; > +} > + > static int multifd_send_initial_packet(MultiFDSendParams *p, Error **errp) > { > MultiFDInit_t msg = {}; > diff --git a/migration/multifd.h b/migration/multifd.h > index 8edea4fdac..85542f3222 100644 > --- a/migration/multifd.h > +++ b/migration/multifd.h > @@ -23,8 +23,10 @@ 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); > > +/* Multifd Compression flags */ > #define MULTIFD_FLAG_SYNC (1 << 0) > #define MULTIFD_FLAG_NOCOMP (1 << 1) > +#define MULTIFD_FLAG_ZLIB (1 << 2) > > /* This value needs to be a multiple of qemu_target_page_size() */ > #define MULTIFD_PACKET_SIZE (512 * 1024) > @@ -157,5 +159,7 @@ typedef struct { > int (*recv_pages)(MultiFDRecvParams *p, uint32_t used, Error **errp); > } MultiFDMethods; > > +void multifd_register_ops(int method, MultiFDMethods *ops); > + > #endif > > diff --git a/qapi/migration.json b/qapi/migration.json > index c2891e6ebf..1714ea51e3 100644 > --- a/qapi/migration.json > +++ b/qapi/migration.json > @@ -499,7 +499,7 @@ > # > ## > { 'enum': 'MultifdCompress', > - 'data': [ 'none' ] } > + 'data': [ 'none', 'zlib' ] } > > ## > # @MigrationParameter: > diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c > index 3d5d2aba8c..985a7d4b97 100644 > --- a/tests/qtest/migration-test.c > +++ b/tests/qtest/migration-test.c > @@ -1313,6 +1313,11 @@ static void test_multifd_tcp_none(void) > test_multifd_tcp("none"); > } > > +static void test_multifd_tcp_zlib(void) > +{ > + test_multifd_tcp("zlib"); > +} > + > /* > * This test does: > * source target > @@ -1475,6 +1480,7 @@ 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_cancel); > + qtest_add_func("/migration/multifd/tcp/zlib", test_multifd_tcp_zlib); > > ret = g_test_run(); > > -- > 2.24.1 > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
On 1/23/20 5:58 AM, Juan Quintela wrote: > Signed-off-by: Juan Quintela <quintela@redhat.com> > --- > +++ b/qapi/migration.json > @@ -499,7 +499,7 @@ > # > ## > { 'enum': 'MultifdCompress', > - 'data': [ 'none' ] } > + 'data': [ 'none', 'zlib' ] } > Patch 9 added 'none' and documented it; it looks odd if 'zlib' is not documented.
"Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote: > * Juan Quintela (quintela@redhat.com) wrote: >> Signed-off-by: Juan Quintela <quintela@redhat.com> >> --- >> + /* We will never have more than page_count pages */ >> + z->zbuff_len = page_count * qemu_target_page_size(); >> + z->zbuff_len *= 2; >> + z->zbuff = g_try_malloc(z->zbuff_len); >> + if (!z->zbuff) { > > Does a deflateEnd need to be called here? Shouldnt matter, but I think that yes. > >> + g_free(z); >> + error_setg(errp, "multifd %d: out of memory for zbuff", p->id); >> + return -1; >> + } >> + return 0; > > I'd like to understand more aobut the failure path - lets say we exit > through one of those return -1's, p->data is still set to point to z > which is now been free'd. Will zlib_send_cleanup get called? > Maybe it's safer to move the 'p->data = z' to right at the bottom before > the return 0 ? Just did that. Good catch. > >> +} >> + >> +/** >> + * 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 = p->data; > > As previously asked above, could this ever get called if zlib_send_setup > has failed? If so does this need to check for !z ? No. if multifd_zlib_setup() returns != 0, then multifd_save_setup() returns != 0, and then we just signal an error and then we cancel migration in multifd_fd_connect. So, if z is NULL, we are already in big trouble. >> + >> + for (i = 0; i < used; i++) { >> + uint32_t available = z->zbuff_len - out_size; >> + int flush = Z_NO_FLUSH; >> + >> + if (i == used - 1) { > > Odd double space formatting there. Ouch. Changed. >> + /* We will never have more than page_count pages */ >> + z->zbuff_len = page_count * qemu_target_page_size(); >> + /* We know compression "could" use more space */ >> + z->zbuff_len *= 2; >> + z->zbuff = g_try_malloc(z->zbuff_len); >> + if (!z->zbuff) { > > inflateEnd and similar question to save? Done. >> + for (i = 0; i < used; i++) { >> + struct iovec *iov = &p->pages->iov[i]; >> + int flush = Z_NO_FLUSH; >> + >> + if (i == used - 1) { >> + flush = Z_SYNC_FLUSH; >> + } >> + >> + zs->avail_out = iov->iov_len; >> + zs->next_out = iov->iov_base; >> + >> + ret = inflate(zs, flush); >> + if (ret != Z_OK) { >> + error_setg(errp, "multifd %d: inflate returned %d instead of Z_OK", >> + p->id, ret); >> + return ret; >> + } >> + out_size += iov->iov_len; > > How do we know that's iov_len ? Because we never had fails O:-) (If it is not, we have a corrupted stream or something has gone very wrong). You win. I think that the correct value is: uint32_t out_size = zs->total_out; ... out_size += zs->total_out - out_size; As a bonus, we can do that outside of the loop. Thanks, Juan.
diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c index ff6a752b19..07ec75d8e3 100644 --- a/hw/core/qdev-properties.c +++ b/hw/core/qdev-properties.c @@ -647,7 +647,7 @@ const PropertyInfo qdev_prop_fdc_drive_type = { const PropertyInfo qdev_prop_multifd_compress = { .name = "MultifdCompress", .description = "multifd_compress values, " - "none", + "none/zlib", .enum_table = &MultifdCompress_lookup, .get = get_enum, .set = 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 += xbzrle.o postcopy-ram.o common-obj-y += qjson.o common-obj-y += block-dirty-bitmap.o common-obj-y += multifd.o +common-obj-y += multifd-zlib.o common-obj-$(CONFIG_RDMA) += rdma.o diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c new file mode 100644 index 0000000000..33d7ee6741 --- /dev/null +++ b/migration/multifd-zlib.c @@ -0,0 +1,289 @@ +/* + * Multifd zlib compression implementation + * + * Copyright (c) 2020 Red Hat Inc + * + * Authors: + * Juan Quintela <quintela@redhat.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include <zlib.h> +#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 = MULTIFD_PACKET_SIZE / qemu_target_page_size(); + struct zlib_data *z = g_malloc0(sizeof(struct zlib_data)); + z_stream *zs = &z->zs; + + p->data = z; + zs->zalloc = Z_NULL; + zs->zfree = Z_NULL; + zs->opaque = Z_NULL; + if (deflateInit(zs, migrate_compress_level()) != 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 = page_count * qemu_target_page_size(); + z->zbuff_len *= 2; + z->zbuff = g_try_malloc(z->zbuff_len); + if (!z->zbuff) { + g_free(z); + error_setg(errp, "multifd %d: out of memory for zbuff", p->id); + return -1; + } + 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 = p->data; + + deflateEnd(&z->zs); + g_free(z->zbuff); + z->zbuff = NULL; + g_free(p->data); + p->data = 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 = p->pages->iov; + struct zlib_data *z = p->data; + z_stream *zs = &z->zs; + uint32_t out_size = 0; + int ret; + uint32_t i; + + for (i = 0; i < used; i++) { + uint32_t available = z->zbuff_len - out_size; + int flush = Z_NO_FLUSH; + + if (i == used - 1) { + flush = Z_SYNC_FLUSH; + } + + zs->avail_in = iov[i].iov_len; + zs->next_in = iov[i].iov_base; + + zs->avail_out = available; + zs->next_out = z->zbuff + out_size; + + ret = deflate(zs, flush); + if (ret != Z_OK) { + error_setg(errp, "multifd %d: deflate returned %d instead of Z_OK", + p->id, ret); + return -1; + } + out_size += available - zs->avail_out; + } + p->next_packet_size = out_size; + p->flags |= 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 **errp) +{ + struct zlib_data *z = p->data; + + return qio_channel_write_all(p->c, (void *)z->zbuff, p->next_packet_size, + 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 = MULTIFD_PACKET_SIZE / qemu_target_page_size(); + struct zlib_data *z = g_malloc0(sizeof(struct zlib_data)); + z_stream *zs = &z->zs; + + p->data = z; + zs->zalloc = Z_NULL; + zs->zfree = Z_NULL; + zs->opaque = Z_NULL; + zs->avail_in = 0; + zs->next_in = Z_NULL; + if (inflateInit(zs) != 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 = page_count * qemu_target_page_size(); + /* We know compression "could" use more space */ + z->zbuff_len *= 2; + z->zbuff = g_try_malloc(z->zbuff_len); + if (!z->zbuff) { + 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 = p->data; + + inflateEnd(&z->zs); + g_free(z->zbuff); + z->zbuff = NULL; + g_free(p->data); + p->data = 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 **errp) +{ + uint32_t in_size = p->next_packet_size; + uint32_t out_size = 0; + uint32_t expected_size = used * qemu_target_page_size(); + struct zlib_data *z = p->data; + z_stream *zs = &z->zs; + int ret; + int i; + + if (p->flags != MULTIFD_FLAG_ZLIB) { + error_setg(errp, "multifd %d: flags received %x flags expected %x", + p->id, MULTIFD_FLAG_ZLIB, p->flags); + return -1; + } + ret = qio_channel_read_all(p->c, (void *)z->zbuff, in_size, errp); + + if (ret != 0) { + return ret; + } + + zs->avail_in = in_size; + zs->next_in = z->zbuff; + + for (i = 0; i < used; i++) { + struct iovec *iov = &p->pages->iov[i]; + int flush = Z_NO_FLUSH; + + if (i == used - 1) { + flush = Z_SYNC_FLUSH; + } + + zs->avail_out = iov->iov_len; + zs->next_out = iov->iov_base; + + ret = inflate(zs, flush); + if (ret != Z_OK) { + error_setg(errp, "multifd %d: inflate returned %d instead of Z_OK", + p->id, ret); + return ret; + } + out_size += iov->iov_len; + } + if (out_size != expected_size) { + error_setg(errp, "multifd %d: packet size received %d size expected %d", + p->id, out_size, expected_size); + return -1; + } + return 0; +} + +static MultiFDMethods multifd_zlib_ops = { + .send_setup = zlib_send_setup, + .send_cleanup = zlib_send_cleanup, + .send_prepare = zlib_send_prepare, + .send_write = zlib_send_write, + .recv_setup = zlib_recv_setup, + .recv_cleanup = zlib_recv_cleanup, + .recv_pages = zlib_recv_pages +}; + +static void multifd_zlib_register(void) +{ + multifd_register_ops(MULTIFD_COMPRESS_ZLIB, &multifd_zlib_ops); +} + +migration_init(multifd_zlib_register); diff --git a/migration/multifd.c b/migration/multifd.c index 353140cd25..a1fc451d49 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -164,6 +164,12 @@ static MultiFDMethods *multifd_ops[MULTIFD_COMPRESS__MAX] = { [MULTIFD_COMPRESS_NONE] = &multifd_nocomp_ops, }; +void multifd_register_ops(int method, MultiFDMethods *ops) +{ + assert(0 < method && method < MULTIFD_COMPRESS__MAX); + multifd_ops[method] = ops; +} + static int multifd_send_initial_packet(MultiFDSendParams *p, Error **errp) { MultiFDInit_t msg = {}; diff --git a/migration/multifd.h b/migration/multifd.h index 8edea4fdac..85542f3222 100644 --- a/migration/multifd.h +++ b/migration/multifd.h @@ -23,8 +23,10 @@ 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); +/* Multifd Compression flags */ #define MULTIFD_FLAG_SYNC (1 << 0) #define MULTIFD_FLAG_NOCOMP (1 << 1) +#define MULTIFD_FLAG_ZLIB (1 << 2) /* This value needs to be a multiple of qemu_target_page_size() */ #define MULTIFD_PACKET_SIZE (512 * 1024) @@ -157,5 +159,7 @@ typedef struct { int (*recv_pages)(MultiFDRecvParams *p, uint32_t used, Error **errp); } MultiFDMethods; +void multifd_register_ops(int method, MultiFDMethods *ops); + #endif diff --git a/qapi/migration.json b/qapi/migration.json index c2891e6ebf..1714ea51e3 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -499,7 +499,7 @@ # ## { 'enum': 'MultifdCompress', - 'data': [ 'none' ] } + 'data': [ 'none', 'zlib' ] } ## # @MigrationParameter: diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c index 3d5d2aba8c..985a7d4b97 100644 --- a/tests/qtest/migration-test.c +++ b/tests/qtest/migration-test.c @@ -1313,6 +1313,11 @@ static void test_multifd_tcp_none(void) test_multifd_tcp("none"); } +static void test_multifd_tcp_zlib(void) +{ + test_multifd_tcp("zlib"); +} + /* * This test does: * source target @@ -1475,6 +1480,7 @@ 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_cancel); + qtest_add_func("/migration/multifd/tcp/zlib", test_multifd_tcp_zlib); ret = g_test_run();
Signed-off-by: Juan Quintela <quintela@redhat.com> --- hw/core/qdev-properties.c | 2 +- migration/Makefile.objs | 1 + migration/multifd-zlib.c | 289 +++++++++++++++++++++++++++++++++++ migration/multifd.c | 6 + migration/multifd.h | 4 + qapi/migration.json | 2 +- tests/qtest/migration-test.c | 6 + 7 files changed, 308 insertions(+), 2 deletions(-) create mode 100644 migration/multifd-zlib.c