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Fri, 23 Jul 2021 01:12:54 +0000 (GMT) Date: Fri, 23 Jul 2021 03:12:52 +0200 From: Halil Pasic To: Christian Borntraeger Subject: Re: [PATCH v2 0/4] Fix restricted DMA vs swiotlb_exit() Message-ID: <20210723031252.655d6a83.pasic@linux.ibm.com> In-Reply-To: <57e37ef9-c055-d6a6-2244-2c7dd243b5c1@de.ibm.com> References: <20210720133826.9075-1-will@kernel.org> <57e37ef9-c055-d6a6-2244-2c7dd243b5c1@de.ibm.com> Organization: IBM X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Ae3eLa12W-x0ipkL-mPwp06xYhUcnGIf X-Proofpoint-GUID: Ae3eLa12W-x0ipkL-mPwp06xYhUcnGIf X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-07-22_16:2021-07-22, 2021-07-22 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1011 priorityscore=1501 mlxscore=0 phishscore=0 bulkscore=0 suspectscore=0 impostorscore=0 spamscore=0 mlxlogscore=999 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107230005 Cc: Halil Pasic , Konrad Rzeszutek Wilk , Robin Murphy , linux-kernel@vger.kernel.org, Nathan Chancellor , iommu@lists.linux-foundation.org, Claire Chang , Will Deacon , Christoph Hellwig , Guenter Roeck X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Thu, 22 Jul 2021 21:22:58 +0200 Christian Borntraeger wrote: > On 20.07.21 15:38, Will Deacon wrote: > > Hi again, folks, > > > > This is version two of the patch series I posted yesterday: > > > > https://lore.kernel.org/r/20210719123054.6844-1-will@kernel.org > > > > The only changes since v1 are: > > > > * Squash patches 2 and 3, amending the commit message accordingly > > * Add Reviewed-by and Tested-by tags from Christoph and Claire (thanks!) > > > > I'd usually leave it a bit longer between postings, but since this fixes > > issues with patches in -next I thought I'd spin a new version immediately. > > > > Cheers, > > FWIW, I just bisected virtio-errors with secure execution mode > qemu-system-s390x: virtio-serial-bus: Unexpected port id 4205794771 for device virtio-serial0.0 > > to > commit 903cd0f315fe426c6a64c54ed389de0becb663dc > Author: Claire Chang > Date: Thu Jun 24 23:55:20 2021 +0800 > > swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing > > Unfortunately this patch series does NOT fix this issue, so it seems that even more > things are broken. > > Any idea what else might be broken? I've done some debugging, and I think I know what is going on. Since that commit we need to set force_swiotlb before the swiotlb itself is initialized. So the patch below should fix the problem. --------------------8<------------------------------------- From: Halil Pasic Date: Fri, 23 Jul 2021 02:57:06 +0200 Subject: [PATCH 1/1] s390/pv: fix the forcing of the swiotlb Since commit 903cd0f315fe ("swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing") if code sets swiotlb_force it needs to do so before the swiotlb is initialised. Otherwise io_tlb_default_mem->force_bounce will not get set to true, and devices that use (the default) swiotlb will not bounce despite switolb_force having the value of SWIOTLB_FORCE. Let us restore swiotlb functionality for PV by fulfilling this new requirement. Signed-off-by: Halil Pasic --- arch/s390/mm/init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 8ac710de1ab1..07bbee9b7320 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -186,9 +186,9 @@ static void pv_init(void) return; /* make sure bounce buffers are shared */ + swiotlb_force = SWIOTLB_FORCE; swiotlb_init(1); swiotlb_update_mem_attributes(); - swiotlb_force = SWIOTLB_FORCE; } void __init mem_init(void) -- 2.29.2 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu