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Thu, 28 Jul 2022 16:12:05 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 28 Jul 2022 16:12:05 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 4958) id 10E03E092A; Thu, 28 Jul 2022 18:05:52 +0200 (CEST) From: Eric Farman To: Matthew Rosato , Alex Williamson Cc: Jason Gunthorpe , Cornelia Huck , Halil Pasic , Christian Borntraeger , Nicolin Chen , linux-s390@vger.kernel.org, kvm@vger.kernel.org, Eric Farman Subject: [PATCH v2 1/3] vfio/ccw: Add length to DMA_UNMAP checks Date: Thu, 28 Jul 2022 18:05:48 +0200 Message-Id: <20220728160550.2119289-2-farman@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220728160550.2119289-1-farman@linux.ibm.com> References: <20220728160550.2119289-1-farman@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: ctUzsi586fiOJZf0TvQ3iOScW6jVvz5v X-Proofpoint-ORIG-GUID: 1whFYETBTlxpamFNMP9DtmiN7nsjXM_A Content-Transfer-Encoding: 8bit X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-07-28_06,2022-07-28_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=999 malwarescore=0 adultscore=0 phishscore=0 bulkscore=0 lowpriorityscore=0 clxscore=1015 impostorscore=0 spamscore=0 priorityscore=1501 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2207280073 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org As pointed out with the simplification of the VFIO_IOMMU_NOTIFY_DMA_UNMAP notifier [1], the length parameter was never used to check against the pinned pages. Let's correct that, and see if a page is within the affected range instead of simply the first page of the range. [1] https://lore.kernel.org/kvm/20220720170457.39cda0d0.alex.williamson@redhat.com/ Signed-off-by: Eric Farman --- drivers/s390/cio/vfio_ccw_cp.c | 14 ++++++++++---- drivers/s390/cio/vfio_ccw_cp.h | 2 +- drivers/s390/cio/vfio_ccw_ops.c | 2 +- 3 files changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c index 8963f452f963..6202f1e3e792 100644 --- a/drivers/s390/cio/vfio_ccw_cp.c +++ b/drivers/s390/cio/vfio_ccw_cp.c @@ -170,12 +170,17 @@ static void page_array_unpin_free(struct page_array *pa, struct vfio_device *vde kfree(pa->pa_iova); } -static bool page_array_iova_pinned(struct page_array *pa, unsigned long iova) +static bool page_array_iova_pinned(struct page_array *pa, unsigned long iova, + unsigned long length) { + unsigned long iova_pfn_start = iova >> PAGE_SHIFT; + unsigned long iova_pfn_end = (iova + length - 1) >> PAGE_SHIFT; + unsigned long pfn; int i; for (i = 0; i < pa->pa_nr; i++) - if (pa->pa_iova[i] == iova) + pfn = pa->pa_iova[i] >> PAGE_SHIFT; + if (pfn >= iova_pfn_start && pfn <= iova_pfn_end) return true; return false; @@ -899,11 +904,12 @@ void cp_update_scsw(struct channel_program *cp, union scsw *scsw) * cp_iova_pinned() - check if an iova is pinned for a ccw chain. * @cp: channel_program on which to perform the operation * @iova: the iova to check + * @length: the length to check from @iova * * If the @iova is currently pinned for the ccw chain, return true; * else return false. */ -bool cp_iova_pinned(struct channel_program *cp, u64 iova) +bool cp_iova_pinned(struct channel_program *cp, u64 iova, u64 length) { struct ccwchain *chain; int i; @@ -913,7 +919,7 @@ bool cp_iova_pinned(struct channel_program *cp, u64 iova) list_for_each_entry(chain, &cp->ccwchain_list, next) { for (i = 0; i < chain->ch_len; i++) - if (page_array_iova_pinned(chain->ch_pa + i, iova)) + if (page_array_iova_pinned(chain->ch_pa + i, iova, length)) return true; } diff --git a/drivers/s390/cio/vfio_ccw_cp.h b/drivers/s390/cio/vfio_ccw_cp.h index 3194d887e08e..54d26e242533 100644 --- a/drivers/s390/cio/vfio_ccw_cp.h +++ b/drivers/s390/cio/vfio_ccw_cp.h @@ -46,6 +46,6 @@ void cp_free(struct channel_program *cp); int cp_prefetch(struct channel_program *cp); union orb *cp_get_orb(struct channel_program *cp, u32 intparm, u8 lpm); void cp_update_scsw(struct channel_program *cp, union scsw *scsw); -bool cp_iova_pinned(struct channel_program *cp, u64 iova); +bool cp_iova_pinned(struct channel_program *cp, u64 iova, u64 length); #endif diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c index 0047fd88f938..3f67fa103c7f 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -39,7 +39,7 @@ static void vfio_ccw_dma_unmap(struct vfio_device *vdev, u64 iova, u64 length) container_of(vdev, struct vfio_ccw_private, vdev); /* Drivers MUST unpin pages in response to an invalidation. */ - if (!cp_iova_pinned(&private->cp, iova)) + if (!cp_iova_pinned(&private->cp, iova, length)) return; vfio_ccw_mdev_reset(private); -- 2.34.1