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bh=WxtXS4eLGYwTDj4pLKCebNibbRltSbmtbkNTzjoaR9I=; b=hL/VEvH6vFXVhu+xk0AE19YmYqSLZW3ylaT7tYuvQqwIq3xHEgnhIN/8dVH3QFLgRyawwh QWcs8f4D0Q1pQDJdSKlTA7bPGl6PjRyDvRS2BDs15BTWQTPGhvOF1rEqkmKxSh8WCcXwja 0BwnYc0ATYEkU5ESbfeiEIL16wiMeuI= X-MC-Unique: DdOW7U7xPUWZdmPjo9Ecpw-1 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, qemu-devel@nongnu.org Subject: [PATCH] blkio: Respect memory-alignment for bounce buffer allocations Date: Wed, 31 Jan 2024 18:31:40 +0100 Message-ID: <20240131173140.42398-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.292, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1706722380679100001 Content-Type: text/plain; charset="utf-8" blkio_alloc_mem_region() requires that the requested buffer size is a multiple of the memory-alignment property. If it isn't, the allocation fails with a return value of -EINVAL. Fix the call in blkio_resize_bounce_pool() to make sure the requested size is properly aligned. I observed this problem with vhost-vdpa, which requires page aligned memory. As the virtio-blk device behind it still had 512 byte blocks, we got bs->bl.request_alignment =3D 512, but actually any request that needed a bounce buffer and was not aligned to 4k would fail without this fix. Suggested-by: Stefano Garzarella Signed-off-by: Kevin Wolf Reviewed-by: Stefan Hajnoczi Reviewed-by: Stefano Garzarella --- block/blkio.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/blkio.c b/block/blkio.c index 0a0a6c0f5f..b989617608 100644 --- a/block/blkio.c +++ b/block/blkio.c @@ -89,6 +89,9 @@ static int blkio_resize_bounce_pool(BDRVBlkioState *s, in= t64_t bytes) /* Pad size to reduce frequency of resize calls */ bytes +=3D 128 * 1024; =20 + /* Align the pool size to avoid blkio_alloc_mem_region() failure */ + bytes =3D QEMU_ALIGN_UP(bytes, s->mem_region_alignment); + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { int ret; =20 --=20 2.43.0