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physmem: qemu_ram_alloc_from_fd extensions

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Extend qemu_ram_alloc_from_fd to support resizable ram, and define
qemu_ram_resize_cb to clean up the API.

Add a grow parameter to extend the file if necessary.  However, if
grow is false, a zero-sized file is always extended.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Link: https://lore.kernel.org/r/1736967650-129648-4-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 11:00:29 -08:00 • committed by Fabiano Rosas
parent 719168fba7
commit 3ec0214816
3 changed files with 31 additions and 21 deletions
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4
system/memory.c
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@ -1680,8 +1680,8 @@ bool memory_region_init_ram_from_fd(MemoryRegion *mr,
mr->readonly = !!(ram_flags & RAM_READONLY);
mr->terminates = true;
mr->destructor = memory_region_destructor_ram;
mr->ram_block = qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, offset,
&err);
mr->ram_block = qemu_ram_alloc_from_fd(size, size, NULL, mr, ram_flags, fd,
offset, false, &err);
if (err) {
mr->size = int128_zero();
object_unparent(OBJECT(mr));