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Tue, 1 Apr 2025 09:11:17 +0000 (GMT) Date: Tue, 1 Apr 2025 11:11:15 +0200 From: Heiko Carstens To: Matthew Rosato Cc: joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, gerald.schaefer@linux.ibm.com, schnelle@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, svens@linux.ibm.com, borntraeger@linux.ibm.com, clg@redhat.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: Re: [PATCH v4 5/5] iommu/s390: allow larger region tables Message-ID: <20250401091115.7691Bd6-hca@linux.ibm.com> References: <20250331202159.85956-1-mjrosato@linux.ibm.com> <20250331202159.85956-6-mjrosato@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250331202159.85956-6-mjrosato@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: iggC1jnG6T90UBVs0OvZOfNAlGnIobQP X-Proofpoint-GUID: iggC1jnG6T90UBVs0OvZOfNAlGnIobQP X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-01_03,2025-03-27_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 suspectscore=0 priorityscore=1501 clxscore=1011 adultscore=0 bulkscore=0 lowpriorityscore=0 spamscore=0 mlxlogscore=651 mlxscore=0 impostorscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2504010057 On Mon, Mar 31, 2025 at 04:21:59PM -0400, Matthew Rosato wrote: > Extend the aperture calculation to consider sizes beyond the maximum > size of a region third table. Attempt to always use the smallest > table size possible to avoid unnecessary extra steps during translation. > Update reserved region calculations to use the appropriate table size. > > Signed-off-by: Matthew Rosato > --- > arch/s390/include/asm/pci_dma.h | 1 + > drivers/iommu/s390-iommu.c | 71 ++++++++++++++++++++++++--------- > 2 files changed, 53 insertions(+), 19 deletions(-) ... > + spin_lock_irqsave(&zdev->dom_lock, flags); > + if (zdev->s390_domain->type == IOMMU_DOMAIN_BLOCKED || > + zdev->s390_domain->type == IOMMU_DOMAIN_IDENTITY) > + goto out; > + > + s390_domain = to_s390_domain(zdev->s390_domain); > + if (zdev->end_dma < max_tbl_size(s390_domain)) { > + end_resv = max_tbl_size(s390_domain) - zdev->end_dma; > + region = iommu_alloc_resv_region(zdev->end_dma + 1, end_resv, > + 0, IOMMU_RESV_RESERVED, > + GFP_KERNEL); GFP_KERNEL allocation while holding a spinlock is not correct.