From patchwork Fri Sep 6 19:57:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 11136009 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DFCF11593 for ; Fri, 6 Sep 2019 19:59:42 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C244720842 for ; Fri, 6 Sep 2019 19:59:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C244720842 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:59856 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i6KOT-0004fV-56 for patchwork-qemu-devel@patchwork.kernel.org; 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Fri, 6 Sep 2019 19:57:55 +0000 (UTC) From: Maxim Levitsky To: qemu-devel@nongnu.org Date: Fri, 6 Sep 2019 22:57:48 +0300 Message-Id: <20190906195750.17651-2-mlevitsk@redhat.com> In-Reply-To: <20190906195750.17651-1-mlevitsk@redhat.com> References: <20190906195750.17651-1-mlevitsk@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Fri, 06 Sep 2019 19:57:57 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 1/3] block/qcow2: refactoring of threaded encryption code X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Vladimir Sementsov-Ogievskiy , =?utf-8?q?Daniel_P?= =?utf-8?q?_=2E_Berrang=C3=A9?= , qemu-block@nongnu.org, qemu-stable , Max Reitz , Maxim Levitsky Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" This commit tries to clarify few function arguments, and add comments describing the encrypt/decrypt interface Signed-off-by: Maxim Levitsky --- block/qcow2-cluster.c | 10 +++---- block/qcow2-threads.c | 61 ++++++++++++++++++++++++++++++++++--------- 2 files changed, 53 insertions(+), 18 deletions(-) diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index f09cc992af..1989b423da 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -463,8 +463,8 @@ static int coroutine_fn do_perform_cow_read(BlockDriverState *bs, } static bool coroutine_fn do_perform_cow_encrypt(BlockDriverState *bs, - uint64_t src_cluster_offset, - uint64_t cluster_offset, + uint64_t guest_cluster_offset, + uint64_t host_cluster_offset, unsigned offset_in_cluster, uint8_t *buffer, unsigned bytes) @@ -474,8 +474,8 @@ static bool coroutine_fn do_perform_cow_encrypt(BlockDriverState *bs, assert((offset_in_cluster & ~BDRV_SECTOR_MASK) == 0); assert((bytes & ~BDRV_SECTOR_MASK) == 0); assert(s->crypto); - if (qcow2_co_encrypt(bs, cluster_offset, - src_cluster_offset + offset_in_cluster, + if (qcow2_co_encrypt(bs, host_cluster_offset, + guest_cluster_offset + offset_in_cluster, buffer, bytes) < 0) { return false; } @@ -496,7 +496,7 @@ static int coroutine_fn do_perform_cow_write(BlockDriverState *bs, } ret = qcow2_pre_write_overlap_check(bs, 0, - cluster_offset + offset_in_cluster, qiov->size, true); + cluster_offset + offset_in_cluster, qiov->size, true); if (ret < 0) { return ret; } diff --git a/block/qcow2-threads.c b/block/qcow2-threads.c index 3b1e63fe41..c3cda0c6a5 100644 --- a/block/qcow2-threads.c +++ b/block/qcow2-threads.c @@ -234,15 +234,19 @@ static int qcow2_encdec_pool_func(void *opaque) } static int coroutine_fn -qcow2_co_encdec(BlockDriverState *bs, uint64_t file_cluster_offset, - uint64_t offset, void *buf, size_t len, Qcow2EncDecFunc func) +qcow2_co_encdec(BlockDriverState *bs, uint64_t host_cluster_offset, + uint64_t guest_offset, void *buf, size_t len, + Qcow2EncDecFunc func) { BDRVQcow2State *s = bs->opaque; + + uint64_t offset = s->crypt_physical_offset ? + host_cluster_offset + offset_into_cluster(s, guest_offset) : + guest_offset; + Qcow2EncDecData arg = { .block = s->crypto, - .offset = s->crypt_physical_offset ? - file_cluster_offset + offset_into_cluster(s, offset) : - offset, + .offset = offset, .buf = buf, .len = len, .func = func, @@ -251,18 +255,49 @@ qcow2_co_encdec(BlockDriverState *bs, uint64_t file_cluster_offset, return qcow2_co_process(bs, qcow2_encdec_pool_func, &arg); } + +/* + * qcow2_co_encrypt() + * + * Encrypts one or more contiguous aligned sectors + * + * @host_cluster_offset - on disk offset of the first cluster in which + * the encrypted data will be written + * Used as an initialization vector for encryption + * + * @guest_offset - guest (virtual) offset of the first sector of the + * data to be encrypted + * Used as an initialization vector for older, qcow2 native encryption + * + * @buf - buffer with the data to encrypt + * @len - length of the buffer (in sector size multiplies) + * + * Note that the group of the sectors, don't have to be aligned + * on cluster boundary and can also cross a cluster boundary. + * + * + */ int coroutine_fn -qcow2_co_encrypt(BlockDriverState *bs, uint64_t file_cluster_offset, - uint64_t offset, void *buf, size_t len) +qcow2_co_encrypt(BlockDriverState *bs, uint64_t host_cluster_offset, + uint64_t guest_offset, void *buf, size_t len) { - return qcow2_co_encdec(bs, file_cluster_offset, offset, buf, len, - qcrypto_block_encrypt); + return qcow2_co_encdec(bs, host_cluster_offset, guest_offset, buf, len, + qcrypto_block_encrypt); } + +/* + * qcow2_co_decrypt() + * + * Decrypts one or more contiguous aligned sectors + * Same function as qcow2_co_encrypt + * + */ + int coroutine_fn -qcow2_co_decrypt(BlockDriverState *bs, uint64_t file_cluster_offset, - uint64_t offset, void *buf, size_t len) +qcow2_co_decrypt(BlockDriverState *bs, uint64_t host_cluster_offset, + uint64_t guest_offset, void *buf, size_t len) { - return qcow2_co_encdec(bs, file_cluster_offset, offset, buf, len, - qcrypto_block_decrypt); + return qcow2_co_encdec(bs, host_cluster_offset, guest_offset, buf, len, + qcrypto_block_decrypt); }