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migration/ram: Refactor precopy ram loading code

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Extract the ramblock parsing code into a routine that operates on the
sequence of headers from the stream and another the parses the
individual ramblock. This makes ram_load_precopy() easier to
comprehend.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231011184604.32364-3-farosas@suse.de>
This commit is contained in:
Nikolay Borisov 2023-10-11 15:45:59 -03:00 committed by Juan Quintela
parent 1618f55221
commit 2f5ced5b93
1 changed files with 82 additions and 64 deletions
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146
migration/ram.c
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@ -3884,6 +3884,85 @@ void colo_flush_ram_cache(void)
trace_colo_flush_ram_cache_end();
}
static int parse_ramblock(QEMUFile *f, RAMBlock *block, ram_addr_t length)
{
int ret = 0;
/* ADVISE is earlier, it shows the source has the postcopy capability on */
bool postcopy_advised = migration_incoming_postcopy_advised();
assert(block);
if (!qemu_ram_is_migratable(block)) {
error_report("block %s should not be migrated !", block->idstr);
return -EINVAL;
}
if (length != block->used_length) {
Error *local_err = NULL;
ret = qemu_ram_resize(block, length, &local_err);
if (local_err) {
error_report_err(local_err);
}
}
/* For postcopy we need to check hugepage sizes match */
if (postcopy_advised && migrate_postcopy_ram() &&
block->page_size != qemu_host_page_size) {
uint64_t remote_page_size = qemu_get_be64(f);
if (remote_page_size != block->page_size) {
error_report("Mismatched RAM page size %s "
"(local) %zd != %" PRId64, block->idstr,
block->page_size, remote_page_size);
ret = -EINVAL;
}
}
if (migrate_ignore_shared()) {
hwaddr addr = qemu_get_be64(f);
if (migrate_ram_is_ignored(block) &&
block->mr->addr != addr) {
error_report("Mismatched GPAs for block %s "
"%" PRId64 "!= %" PRId64, block->idstr,
(uint64_t)addr, (uint64_t)block->mr->addr);
ret = -EINVAL;
}
}
ret = rdma_block_notification_handle(f, block->idstr);
if (ret < 0) {
qemu_file_set_error(f, ret);
}
return ret;
}
static int parse_ramblocks(QEMUFile *f, ram_addr_t total_ram_bytes)
{
int ret = 0;
/* Synchronize RAM block list */
while (!ret && total_ram_bytes) {
RAMBlock *block;
char id[256];
ram_addr_t length;
int len = qemu_get_byte(f);
qemu_get_buffer(f, (uint8_t *)id, len);
id[len] = 0;
length = qemu_get_be64(f);
block = qemu_ram_block_by_name(id);
if (block) {
ret = parse_ramblock(f, block, length);
} else {
error_report("Unknown ramblock \"%s\", cannot accept "
"migration", id);
ret = -EINVAL;
}
total_ram_bytes -= length;
}
return ret;
}
/**
* ram_load_precopy: load pages in precopy case
*
@ -3898,14 +3977,13 @@ static int ram_load_precopy(QEMUFile *f)
{
MigrationIncomingState *mis = migration_incoming_get_current();
int flags = 0, ret = 0, invalid_flags = 0, len = 0, i = 0;
/* ADVISE is earlier, it shows the source has the postcopy capability on */
bool postcopy_advised = migration_incoming_postcopy_advised();
if (!migrate_compress()) {
invalid_flags |= RAM_SAVE_FLAG_COMPRESS_PAGE;
}
while (!ret && !(flags & RAM_SAVE_FLAG_EOS)) {
ram_addr_t addr, total_ram_bytes;
ram_addr_t addr;
void *host = NULL, *host_bak = NULL;
uint8_t ch;
@ -3976,67 +4054,7 @@ static int ram_load_precopy(QEMUFile *f)
switch (flags & ~RAM_SAVE_FLAG_CONTINUE) {
case RAM_SAVE_FLAG_MEM_SIZE:
/* Synchronize RAM block list */
total_ram_bytes = addr;
while (!ret && total_ram_bytes) {
RAMBlock *block;
char id[256];
ram_addr_t length;
len = qemu_get_byte(f);
qemu_get_buffer(f, (uint8_t *)id, len);
id[len] = 0;
length = qemu_get_be64(f);
block = qemu_ram_block_by_name(id);
if (block && !qemu_ram_is_migratable(block)) {
error_report("block %s should not be migrated !", id);
ret = -EINVAL;
} else if (block) {
if (length != block->used_length) {
Error *local_err = NULL;
ret = qemu_ram_resize(block, length,
&local_err);
if (local_err) {
error_report_err(local_err);
}
}
/* For postcopy we need to check hugepage sizes match */
if (postcopy_advised && migrate_postcopy_ram() &&
block->page_size != qemu_host_page_size) {
uint64_t remote_page_size = qemu_get_be64(f);
if (remote_page_size != block->page_size) {
error_report("Mismatched RAM page size %s "
"(local) %zd != %" PRId64,
id, block->page_size,
remote_page_size);
ret = -EINVAL;
}
}
if (migrate_ignore_shared()) {
hwaddr addr2 = qemu_get_be64(f);
if (migrate_ram_is_ignored(block) &&
block->mr->addr != addr2) {
error_report("Mismatched GPAs for block %s "
"%" PRId64 "!= %" PRId64,
id, (uint64_t)addr2,
(uint64_t)block->mr->addr);
ret = -EINVAL;
}
}
ret = rdma_block_notification_handle(f, block->idstr);
if (ret < 0) {
qemu_file_set_error(f, ret);
}
} else {
error_report("Unknown ramblock \"%s\", cannot "
"accept migration", id);
ret = -EINVAL;
}
total_ram_bytes -= length;
}
ret = parse_ramblocks(f, addr);
break;
case RAM_SAVE_FLAG_ZERO: