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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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13
include/exec/ram_addr.h
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@ -111,23 +111,30 @@ long qemu_maxrampagesize(void);
*
* Parameters:
* @size: the size in bytes of the ram block
* @max_size: the maximum size of the block after resizing
* @mr: the memory region where the ram block is
* @resized: callback after calls to qemu_ram_resize
* @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_PMEM,
* RAM_NORESERVE, RAM_PROTECTED, RAM_NAMED_FILE, RAM_READONLY,
* RAM_READONLY_FD, RAM_GUEST_MEMFD
* @mem_path or @fd: specify the backing file or device
* @offset: Offset into target file
* @grow: extend file if necessary (but an empty file is always extended).
* @errp: pointer to Error*, to store an error if it happens
*
* Return:
* On success, return a pointer to the ram block.
* On failure, return NULL.
*/
typedef void (*qemu_ram_resize_cb)(const char *, uint64_t length, void *host);
RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
uint32_t ram_flags, const char *mem_path,
off_t offset, Error **errp);
RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, ram_addr_t max_size,
qemu_ram_resize_cb resized, MemoryRegion *mr,
uint32_t ram_flags, int fd, off_t offset,
bool grow,
Error **errp);
RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
@ -135,9 +142,7 @@ RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
RAMBlock *qemu_ram_alloc(ram_addr_t size, uint32_t ram_flags, MemoryRegion *mr,
Error **errp);
RAMBlock *qemu_ram_alloc_resizeable(ram_addr_t size, ram_addr_t max_size,
void (*resized)(const char*,
uint64_t length,
void *host),
qemu_ram_resize_cb resized,
MemoryRegion *mr, Error **errp);
void qemu_ram_free(RAMBlock *block);