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Thu, 9 Nov 2023 22:53:07 +0000 (GMT) Received: from smtpav02.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5D4CB5805C; Thu, 9 Nov 2023 22:53:06 +0000 (GMT) Received: from li-2311da4c-2e09-11b2-a85c-c003041e9174.ibm.com.com (unknown [9.61.66.47]) by smtpav02.wdc07v.mail.ibm.com (Postfix) with ESMTP; Thu, 9 Nov 2023 22:53:06 +0000 (GMT) From: Matthew Rosato To: qemu-s390x@nongnu.org Cc: farman@linux.ibm.com, thuth@redhat.com, clg@redhat.com, pasic@linux.ibm.com, borntraeger@linux.ibm.com, richard.henderson@linaro.org, david@redhat.com, iii@linux.ibm.com, qemu-devel@nongnu.org Subject: [PATCH 2/2] s390x/pci: only limit DMA aperture if vfio DMA limit reported Date: Thu, 9 Nov 2023 17:53:02 -0500 Message-ID: <20231109225302.401344-3-mjrosato@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231109225302.401344-1-mjrosato@linux.ibm.com> References: <20231109225302.401344-1-mjrosato@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: N34BJXnlLbwdn-74TCLkxvJef0YO3hbR X-Proofpoint-GUID: MTR73H_MlDqv7BKVkAo7uDq_QziUuekT X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-09_16,2023-11-09_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 phishscore=0 mlxscore=0 adultscore=0 priorityscore=1501 clxscore=1015 bulkscore=0 malwarescore=0 mlxlogscore=848 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311090167 Received-SPF: pass client-ip=148.163.158.5; envelope-from=mjrosato@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org If the host kernel lacks vfio DMA limit reporting, do not attempt to shrink the guest DMA aperture. Fixes: df202e3ff3 ("s390x/pci: shrink DMA aperture to be bound by vfio DMA limit") Signed-off-by: Matthew Rosato --- hw/s390x/s390-pci-vfio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c index 7218583883..22b39a7d18 100644 --- a/hw/s390x/s390-pci-vfio.c +++ b/hw/s390x/s390-pci-vfio.c @@ -136,7 +136,7 @@ static void s390_pci_read_base(S390PCIBusDevice *pbdev, * to the guest based upon the vfio DMA limit. */ vfio_size = pbdev->iommu->max_dma_limit << TARGET_PAGE_BITS; - if (vfio_size < (cap->end_dma - cap->start_dma + 1)) { + if ((vfio_size > 0) && (vfio_size < (cap->end_dma - cap->start_dma + 1))) { pbdev->zpci_fn.edma = cap->start_dma + vfio_size - 1; } }