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migration/ram: Merge save_zero_page functions 

We don't need to do this in two pieces. One single function makes it
easier to grasp, specially since it removes the indirection on the
return value handling.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231011184604.32364-7-farosas@suse.de>
This commit is contained in:
Fabiano Rosas 2023-10-11 15:46:03 -03:00 committed by Juan Quintela
parent ccc09db87c
commit 8697eb8577
1 changed files with 13 additions and 33 deletions
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46
migration/ram.c
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@ -1137,32 +1137,6 @@ void ram_release_page(const char *rbname, uint64_t offset)
ram_discard_range(rbname, offset, TARGET_PAGE_SIZE);
}
/**
* save_zero_page_to_file: send the zero page to the file
*
* Returns the size of data written to the file, 0 means the page is not
* a zero page
*
* @pss: current PSS channel
* @block: block that contains the page we want to send
* @offset: offset inside the block for the page
*/
static int save_zero_page_to_file(PageSearchStatus *pss, RAMBlock *block,
ram_addr_t offset)
{
uint8_t *p = block->host + offset;
QEMUFile *file = pss->pss_channel;
int len = 0;
if (buffer_is_zero(p, TARGET_PAGE_SIZE)) {
len += save_page_header(pss, file, block, offset | RAM_SAVE_FLAG_ZERO);
qemu_put_byte(file, 0);
len += 1;
ram_release_page(block->idstr, offset);
}
return len;
}
/**
* save_zero_page: send the zero page to the stream
*
@ -1176,12 +1150,19 @@ static int save_zero_page_to_file(PageSearchStatus *pss, RAMBlock *block,
static int save_zero_page(RAMState *rs, PageSearchStatus *pss, RAMBlock *block,
ram_addr_t offset)
{
int len = save_zero_page_to_file(pss, block, offset);
uint8_t *p = block->host + offset;
QEMUFile *file = pss->pss_channel;
int len = 0;
if (!len) {
return -1;
if (!buffer_is_zero(p, TARGET_PAGE_SIZE)) {
return 0;
}
len += save_page_header(pss, file, block, offset | RAM_SAVE_FLAG_ZERO);
qemu_put_byte(file, 0);
len += 1;
ram_release_page(block->idstr, offset);
stat64_add(&mig_stats.zero_pages, 1);
ram_transferred_add(len);
@ -1195,7 +1176,7 @@ static int save_zero_page(RAMState *rs, PageSearchStatus *pss, RAMBlock *block,
XBZRLE_cache_unlock();
}
return 1;
return len;
}
/*
@ -2152,9 +2133,8 @@ static int ram_save_target_page_legacy(RAMState *rs, PageSearchStatus *pss)
return 1;
}
res = save_zero_page(rs, pss, block, offset);
if (res > 0) {
return res;
if (save_zero_page(rs, pss, block, offset)) {
return 1;
}
/*