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hostmem-memfd: preserve for cpr

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Preserve memory-backend-memfd 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/1736967650-129648-10-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 11:00:35 -08:00 • committed by Fabiano Rosas
parent 2b7e9739fa
commit 28eaa5957d
1 changed files with 9 additions and 3 deletions
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12
backends/hostmem-memfd.c
View file

@ -17,6 +17,7 @@
#include "qemu/module.h" #include "qemu/module.h"
#include "qapi/error.h" #include "qapi/error.h"
#include "qom/object.h" #include "qom/object.h"
#include "migration/cpr.h"
OBJECT_DECLARE_SIMPLE_TYPE(HostMemoryBackendMemfd, MEMORY_BACKEND_MEMFD) OBJECT_DECLARE_SIMPLE_TYPE(HostMemoryBackendMemfd, MEMORY_BACKEND_MEMFD)
@ -33,15 +34,19 @@ static bool
memfd_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) memfd_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
{ {
HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(backend); HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(backend);
g_autofree char *name = NULL; g_autofree char *name = host_memory_backend_get_name(backend);
int fd = cpr_find_fd(name, 0);
uint32_t ram_flags; uint32_t ram_flags;
int fd;
if (!backend->size) { if (!backend->size) {
error_setg(errp, "can't create backend with size 0"); error_setg(errp, "can't create backend with size 0");
return false; return false;
} }
if (fd >= 0) {
goto have_fd;
}
fd = qemu_memfd_create(TYPE_MEMORY_BACKEND_MEMFD, backend->size, fd = qemu_memfd_create(TYPE_MEMORY_BACKEND_MEMFD, backend->size,
m->hugetlb, m->hugetlbsize, m->seal ? m->hugetlb, m->hugetlbsize, m->seal ?
F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL : 0, F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL : 0,
@ -49,9 +54,10 @@ memfd_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
if (fd == -1) { if (fd == -1) {
return false; return false;
} }
cpr_save_fd(name, 0, fd);
have_fd:
backend->aligned = true; backend->aligned = true;
name = host_memory_backend_get_name(backend);
ram_flags = backend->share ? RAM_SHARED : RAM_PRIVATE; ram_flags = backend->share ? RAM_SHARED : RAM_PRIVATE;
ram_flags |= backend->reserve ? 0 : RAM_NORESERVE; ram_flags |= backend->reserve ? 0 : RAM_NORESERVE;
ram_flags |= backend->guest_memfd ? RAM_GUEST_MEMFD : 0; ram_flags |= backend->guest_memfd ? RAM_GUEST_MEMFD : 0;