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block/crypto: create ciphers on demand

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Ciphers are pre-allocated by qcrypto_block_init_cipher() depending on
the given number of threads. The -device
virtio-blk-pci,iothread-vq-mapping= feature allows users to assign
multiple IOThreads to a virtio-blk device, but the association between
the virtio-blk device and the block driver happens after the block
driver is already open.

When the number of threads given to qcrypto_block_init_cipher() is
smaller than the actual number of threads at runtime, the
block->n_free_ciphers > 0 assertion in qcrypto_block_pop_cipher() can
fail.

Get rid of qcrypto_block_init_cipher() n_thread's argument and allocate
ciphers on demand.

Reported-by: Qing Wang <qinwang@redhat.com>
Buglink: https://issues.redhat.com/browse/RHEL-36159
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20240527155851.892885-2-stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2024-05-27 11:58:50 -04:00 • committed by Kevin Wolf
parent 24687abf23
commit af206c284e
4 changed files with 78 additions and 50 deletions
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3
crypto/block-luks.c
View file

@ -1262,7 +1262,6 @@ qcrypto_block_luks_open(QCryptoBlock *block,
luks->cipher_mode,
masterkey,
luks->header.master_key_len,
n_threads,
errp) < 0) {
goto fail;
}
@ -1456,7 +1455,7 @@ qcrypto_block_luks_create(QCryptoBlock *block,
/* Setup the block device payload encryption objects */
if (qcrypto_block_init_cipher(block, luks_opts.cipher_alg,
luks_opts.cipher_mode, masterkey,
luks->header.master_key_len, 1, errp) < 0) {
luks->header.master_key_len, errp) < 0) {
goto error;
}