#include "qemu/osdep.h"
#include <zlib.h>
#include "qemu/rcu.h"
+#include "exec/ramblock.h"
#include "exec/target_page.h"
#include "qapi/error.h"
#include "migration.h"
uint8_t *zbuff;
/* size of compressed buffer */
uint32_t zbuff_len;
+ /* uncompressed buffer of size qemu_target_page_size() */
+ uint8_t *buf;
};
/* Multifd zlib compression */
*/
static int zlib_send_setup(MultiFDSendParams *p, Error **errp)
{
- struct zlib_data *z = g_malloc0(sizeof(struct zlib_data));
+ struct zlib_data *z = g_new0(struct zlib_data, 1);
z_stream *zs = &z->zs;
+ const char *err_msg;
zs->zalloc = Z_NULL;
zs->zfree = Z_NULL;
zs->opaque = Z_NULL;
if (deflateInit(zs, migrate_multifd_zlib_level()) != Z_OK) {
- g_free(z);
- error_setg(errp, "multifd %d: deflate init failed", p->id);
- return -1;
+ err_msg = "deflate init failed";
+ goto err_free_z;
}
- /* To be safe, we reserve twice the size of the packet */
- z->zbuff_len = MULTIFD_PACKET_SIZE * 2;
+ /* This is the maxium size of the compressed buffer */
+ z->zbuff_len = compressBound(MULTIFD_PACKET_SIZE);
z->zbuff = 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;
+ err_msg = "out of memory for zbuff";
+ goto err_deflate_end;
+ }
+ z->buf = g_try_malloc(qemu_target_page_size());
+ if (!z->buf) {
+ err_msg = "out of memory for buf";
+ goto err_free_zbuff;
}
p->data = z;
return 0;
+
+err_free_zbuff:
+ g_free(z->zbuff);
+err_deflate_end:
+ deflateEnd(&z->zs);
+err_free_z:
+ g_free(z);
+ error_setg(errp, "multifd %u: %s", p->id, err_msg);
+ return -1;
}
/**
deflateEnd(&z->zs);
g_free(z->zbuff);
z->zbuff = NULL;
+ g_free(z->buf);
+ z->buf = NULL;
g_free(p->data);
p->data = NULL;
}
*/
static int zlib_send_prepare(MultiFDSendParams *p, Error **errp)
{
- struct iovec *iov = p->pages->iov;
struct zlib_data *z = p->data;
+ size_t page_size = qemu_target_page_size();
z_stream *zs = &z->zs;
uint32_t out_size = 0;
int ret;
uint32_t i;
- for (i = 0; i < p->pages->num; i++) {
+ for (i = 0; i < p->normal_num; i++) {
uint32_t available = z->zbuff_len - out_size;
int flush = Z_NO_FLUSH;
- if (i == p->pages->num - 1) {
+ if (i == p->normal_num - 1) {
flush = Z_SYNC_FLUSH;
}
- zs->avail_in = iov[i].iov_len;
- zs->next_in = iov[i].iov_base;
+ /*
+ * Since the VM might be running, the page may be changing concurrently
+ * with compression. zlib does not guarantee that this is safe,
+ * therefore copy the page before calling deflate().
+ */
+ memcpy(z->buf, p->pages->block->host + p->normal[i], page_size);
+ zs->avail_in = page_size;
+ zs->next_in = z->buf;
zs->avail_out = available;
zs->next_out = z->zbuff + out_size;
ret = deflate(zs, flush);
} while (ret == Z_OK && zs->avail_in && zs->avail_out);
if (ret == Z_OK && zs->avail_in) {
- error_setg(errp, "multifd %d: deflate failed to compress all input",
+ error_setg(errp, "multifd %u: deflate failed to compress all input",
p->id);
return -1;
}
if (ret != Z_OK) {
- error_setg(errp, "multifd %d: deflate returned %d instead of Z_OK",
+ error_setg(errp, "multifd %u: deflate returned %d instead of Z_OK",
p->id, ret);
return -1;
}
out_size += available - zs->avail_out;
}
+ p->iov[p->iovs_num].iov_base = z->zbuff;
+ p->iov[p->iovs_num].iov_len = out_size;
+ p->iovs_num++;
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
*
*/
static int zlib_recv_setup(MultiFDRecvParams *p, Error **errp)
{
- struct zlib_data *z = g_malloc0(sizeof(struct zlib_data));
+ struct zlib_data *z = g_new0(struct zlib_data, 1);
z_stream *zs = &z->zs;
p->data = z;
zs->avail_in = 0;
zs->next_in = Z_NULL;
if (inflateInit(zs) != Z_OK) {
- error_setg(errp, "multifd %d: inflate init failed", p->id);
+ error_setg(errp, "multifd %u: inflate init failed", p->id);
return -1;
}
/* To be safe, we reserve twice the size of the packet */
z->zbuff = g_try_malloc(z->zbuff_len);
if (!z->zbuff) {
inflateEnd(zs);
- error_setg(errp, "multifd %d: out of memory for zbuff", p->id);
+ error_setg(errp, "multifd %u: out of memory for zbuff", p->id);
return -1;
}
return 0;
* 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)
+static int zlib_recv_pages(MultiFDRecvParams *p, Error **errp)
{
struct zlib_data *z = p->data;
+ size_t page_size = qemu_target_page_size();
z_stream *zs = &z->zs;
uint32_t in_size = p->next_packet_size;
/* we measure the change of total_out */
uint32_t out_size = zs->total_out;
- uint32_t expected_size = used * qemu_target_page_size();
+ uint32_t expected_size = p->normal_num * page_size;
uint32_t flags = p->flags & MULTIFD_FLAG_COMPRESSION_MASK;
int ret;
int i;
if (flags != MULTIFD_FLAG_ZLIB) {
- error_setg(errp, "multifd %d: flags received %x flags expected %x",
+ error_setg(errp, "multifd %u: flags received %x flags expected %x",
p->id, flags, MULTIFD_FLAG_ZLIB);
return -1;
}
zs->avail_in = in_size;
zs->next_in = z->zbuff;
- for (i = 0; i < used; i++) {
- struct iovec *iov = &p->pages->iov[i];
+ for (i = 0; i < p->normal_num; i++) {
int flush = Z_NO_FLUSH;
unsigned long start = zs->total_out;
- if (i == used - 1) {
+ if (i == p->normal_num - 1) {
flush = Z_SYNC_FLUSH;
}
- zs->avail_out = iov->iov_len;
- zs->next_out = iov->iov_base;
+ zs->avail_out = page_size;
+ zs->next_out = p->host + p->normal[i];
/*
* Welcome to inflate semantics
do {
ret = inflate(zs, flush);
} while (ret == Z_OK && zs->avail_in
- && (zs->total_out - start) < iov->iov_len);
- if (ret == Z_OK && (zs->total_out - start) < iov->iov_len) {
- error_setg(errp, "multifd %d: inflate generated too few output",
+ && (zs->total_out - start) < page_size);
+ if (ret == Z_OK && (zs->total_out - start) < page_size) {
+ error_setg(errp, "multifd %u: inflate generated too few output",
p->id);
return -1;
}
if (ret != Z_OK) {
- error_setg(errp, "multifd %d: inflate returned %d instead of Z_OK",
+ error_setg(errp, "multifd %u: inflate returned %d instead of Z_OK",
p->id, ret);
return -1;
}
}
out_size = zs->total_out - out_size;
if (out_size != expected_size) {
- error_setg(errp, "multifd %d: packet size received %d size expected %d",
+ error_setg(errp, "multifd %u: packet size received %u size expected %u",
p->id, out_size, expected_size);
return -1;
}
.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
projects / mirror_qemu.git / blobdiff