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hostmem-shm: preserve for cpr

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Preserve memory-backend-shm memory objects during cpr-transfer.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/1736967650-129648-11-git-send-email-steven.sistare@oracle.com
Signed-off-by: Fabiano Rosas <farosas@suse.de>
This commit is contained in:
Steve Sistare 2025-01-15 11:00:36 -08:00 • committed by Fabiano Rosas
parent 28eaa5957d
commit 2ef121688f
1 changed files with 9 additions and 3 deletions
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12
backends/hostmem-shm.c
View file

@ -13,6 +13,7 @@
#include "qemu/osdep.h" #include "qemu/osdep.h"
#include "system/hostmem.h" #include "system/hostmem.h"
#include "qapi/error.h" #include "qapi/error.h"
#include "migration/cpr.h"
#define TYPE_MEMORY_BACKEND_SHM "memory-backend-shm" #define TYPE_MEMORY_BACKEND_SHM "memory-backend-shm"
@ -25,9 +26,9 @@ struct HostMemoryBackendShm {
static bool static bool
shm_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) shm_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
{ {
g_autofree char *backend_name = NULL; g_autofree char *backend_name = host_memory_backend_get_name(backend);
uint32_t ram_flags; uint32_t ram_flags;
int fd; int fd = cpr_find_fd(backend_name, 0);
if (!backend->size) { if (!backend->size) {
error_setg(errp, "can't create shm backend with size 0"); error_setg(errp, "can't create shm backend with size 0");
@ -39,13 +40,18 @@ shm_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
return false; return false;
} }
if (fd >= 0) {
goto have_fd;
}
fd = qemu_shm_alloc(backend->size, errp); fd = qemu_shm_alloc(backend->size, errp);
if (fd < 0) { if (fd < 0) {
return false; return false;
} }
cpr_save_fd(backend_name, 0, fd);
have_fd:
/* Let's do the same as memory-backend-ram,share=on would do. */ /* Let's do the same as memory-backend-ram,share=on would do. */
backend_name = host_memory_backend_get_name(backend);
ram_flags = RAM_SHARED; ram_flags = RAM_SHARED;
ram_flags |= backend->reserve ? 0 : RAM_NORESERVE; ram_flags |= backend->reserve ? 0 : RAM_NORESERVE;