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Emulated devices and other BlockBackend users wishing to take advantage of blk_register_buf() all have the same repetitive job: register RAMBlocks with the BlockBackend using RAMBlockNotifier. Add a BlockRAMRegistrar API to do this. A later commit will use this from hw/block/virtio-blk.c. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Message-id: 20221013185908.1297568-10-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* BlockBackend RAM Registrar
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "qemu/osdep.h"
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#include "sysemu/block-backend.h"
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#include "sysemu/block-ram-registrar.h"
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#include "qapi/error.h"
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static void ram_block_added(RAMBlockNotifier *n, void *host, size_t size,
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size_t max_size)
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{
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BlockRAMRegistrar *r = container_of(n, BlockRAMRegistrar, notifier);
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Error *err = NULL;
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if (!r->ok) {
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return; /* don't try again if we've already failed */
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}
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if (!blk_register_buf(r->blk, host, max_size, &err)) {
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error_report_err(err);
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ram_block_notifier_remove(&r->notifier);
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r->ok = false;
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}
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}
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static void ram_block_removed(RAMBlockNotifier *n, void *host, size_t size,
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size_t max_size)
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{
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BlockRAMRegistrar *r = container_of(n, BlockRAMRegistrar, notifier);
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blk_unregister_buf(r->blk, host, max_size);
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}
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void blk_ram_registrar_init(BlockRAMRegistrar *r, BlockBackend *blk)
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{
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r->blk = blk;
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r->notifier = (RAMBlockNotifier){
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.ram_block_added = ram_block_added,
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.ram_block_removed = ram_block_removed,
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/*
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* .ram_block_resized() is not necessary because we use the max_size
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* value that does not change across resize.
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*/
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};
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r->ok = true;
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ram_block_notifier_add(&r->notifier);
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}
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void blk_ram_registrar_destroy(BlockRAMRegistrar *r)
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{
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if (r->ok) {
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ram_block_notifier_remove(&r->notifier);
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}
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}
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