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migration: VMSTATE_FD

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Define VMSTATE_FD for declaring a file descriptor field in a
VMStateDescription.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/1736967650-129648-15-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 11:00:40 -08:00 • committed by Fabiano Rosas
parent b5779dc7cf
commit e3965dc352
2 changed files with 32 additions and 0 deletions
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9
include/migration/vmstate.h
View file

@ -230,6 +230,7 @@ extern const VMStateInfo vmstate_info_uint8;
extern const VMStateInfo vmstate_info_uint16;
extern const VMStateInfo vmstate_info_uint32;
extern const VMStateInfo vmstate_info_uint64;
extern const VMStateInfo vmstate_info_fd;
/** Put this in the stream when migrating a null pointer.*/
#define VMS_NULLPTR_MARKER (0x30U) /* '0' */
@ -902,6 +903,9 @@ extern const VMStateInfo vmstate_info_qlist;
#define VMSTATE_UINT64_V(_f, _s, _v) \
VMSTATE_SINGLE(_f, _s, _v, vmstate_info_uint64, uint64_t)
#define VMSTATE_FD_V(_f, _s, _v) \
VMSTATE_SINGLE(_f, _s, _v, vmstate_info_fd, int32_t)
#ifdef CONFIG_LINUX
#define VMSTATE_U8_V(_f, _s, _v) \
@ -936,6 +940,9 @@ extern const VMStateInfo vmstate_info_qlist;
#define VMSTATE_UINT64(_f, _s) \
VMSTATE_UINT64_V(_f, _s, 0)
#define VMSTATE_FD(_f, _s) \
VMSTATE_FD_V(_f, _s, 0)
#ifdef CONFIG_LINUX
#define VMSTATE_U8(_f, _s) \
@ -1009,6 +1016,8 @@ extern const VMStateInfo vmstate_info_qlist;
#define VMSTATE_UINT64_TEST(_f, _s, _t) \
VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_info_uint64, uint64_t)
#define VMSTATE_FD_TEST(_f, _s, _t) \
VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_info_fd, int32_t)
#define VMSTATE_TIMER_PTR_TEST(_f, _s, _test) \
VMSTATE_POINTER_TEST(_f, _s, _test, vmstate_info_timer, QEMUTimer *)

23
migration/vmstate-types.c
View file

@ -314,6 +314,29 @@ const VMStateInfo vmstate_info_uint64 = {
.put = put_uint64,
};
/* File descriptor communicated via SCM_RIGHTS */
static int get_fd(QEMUFile *f, void *pv, size_t size,
const VMStateField *field)
{
int32_t *v = pv;
*v = qemu_file_get_fd(f);
return 0;
}
static int put_fd(QEMUFile *f, void *pv, size_t size,
const VMStateField *field, JSONWriter *vmdesc)
{
int32_t *v = pv;
return qemu_file_put_fd(f, *v);
}
const VMStateInfo vmstate_info_fd = {
.name = "fd",
.get = get_fd,
.put = put_fd,
};
static int get_nullptr(QEMUFile *f, void *pv, size_t size,
const VMStateField *field)