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fix qemu exit on memory hotplug when allocation fails at prealloc time

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When adding hostmem backend at runtime, QEMU might exit with error:
  "os_mem_prealloc: Insufficient free host memory pages available to allocate guest RAM"

It happens due to os_mem_prealloc() not handling errors gracefully.

Fix it by passing errp argument so that os_mem_prealloc() could
report error to callers and undo performed allocation when
os_mem_prealloc() fails.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1469008443-72059-1-git-send-email-imammedo@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Igor Mammedov 2016-07-20 11:54:03 +02:00 • committed by Paolo Bonzini
parent 0b21757124
commit 056b68af77
5 changed files with 38 additions and 22 deletions
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10
exec.c
View file

@ -1226,7 +1226,7 @@ static void *file_ram_alloc(RAMBlock *block,
char *filename;
char *sanitized_name;
char *c;
void *area;
void *area = MAP_FAILED;
int fd = -1;
int64_t page_size;
@ -1314,13 +1314,19 @@ static void *file_ram_alloc(RAMBlock *block,
}
if (mem_prealloc) {
os_mem_prealloc(fd, area, memory);
os_mem_prealloc(fd, area, memory, errp);
if (errp && *errp) {
goto error;
}
}
block->fd = fd;
return area;
error:
if (area != MAP_FAILED) {
qemu_ram_munmap(area, memory);
}
if (unlink_on_error) {
unlink(path);
}