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Thu, 17 Sep 2020 14:20:49 +0000 (GMT) From: Matthew Rosato To: alex.williamson@redhat.com, cohuck@redhat.com Subject: [PATCH v4 0/5] s390x/pci: Accomodate vfio DMA limiting Date: Thu, 17 Sep 2020 10:20:40 -0400 Message-Id: <1600352445-21110-1-git-send-email-mjrosato@linux.ibm.com> X-Mailer: git-send-email 1.8.3.1 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-17_09:2020-09-16, 2020-09-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxscore=0 phishscore=0 malwarescore=0 mlxlogscore=999 priorityscore=1501 impostorscore=0 clxscore=1015 suspectscore=0 adultscore=0 lowpriorityscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009170104 Received-SPF: pass client-ip=148.163.156.1; envelope-from=mjrosato@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/17 10:20:55 X-ACL-Warn: Detected OS = Linux 3.x [generic] [fuzzy] X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thuth@redhat.com, kvm@vger.kernel.org, pmorel@linux.ibm.com, david@redhat.com, schnelle@linux.ibm.com, qemu-devel@nongnu.org, pasic@linux.ibm.com, borntraeger@de.ibm.com, qemu-s390x@nongnu.org, mst@redhat.com, pbonzini@redhat.com, philmd@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Kernel commit 492855939bdb added a limit to the number of outstanding DMA requests for a type1 vfio container. However, lazy unmapping in s390 can in fact cause quite a large number of outstanding DMA requests to build up prior to being purged, potentially the entire guest DMA space. This results in unexpected 'VFIO_MAP_DMA failed: No space left on device' conditions seen in QEMU. This patchset adds support to qemu to retrieve the number of allowable DMA requests via the VFIO_IOMMU_GET_INFO ioctl. The patches are separated into vfio hits which add support for reading in VFIO_IOMMU_GET_INFO capability chains and getting the per-container dma_avail value, and s390 hits to track DMA usage on a per-container basis. Associated kernel patch: https://marc.info/?l=kvm&m=160019703922812&w=2 Changes from v3: - Patch 2,3: Added RBs provided (thank you!) - Patch 4: retry the ioctl in the same manner as vfio_get_region_info - Patch 5: switch to static inline functions - Patch 5: relocate more code to s390-pci-vfio.* Matthew Rosato (5): linux-headers: update against 5.9-rc5 vfio: Create shared routine for scanning info capabilities vfio: Find DMA available capability s390x/pci: Add routine to get the vfio dma available count s390x/pci: Honor DMA limits set by vfio hw/s390x/meson.build | 1 + hw/s390x/s390-pci-bus.c | 16 ++- hw/s390x/s390-pci-bus.h | 9 ++ hw/s390x/s390-pci-inst.c | 45 ++++++- hw/s390x/s390-pci-inst.h | 3 + hw/s390x/s390-pci-vfio.c | 96 ++++++++++++++ hw/s390x/s390-pci-vfio.h | 22 ++++ hw/vfio/common.c | 52 ++++++-- include/hw/vfio/vfio-common.h | 2 + include/standard-headers/drm/drm_fourcc.h | 140 +++++++++++++++++++++ include/standard-headers/linux/ethtool.h | 87 +++++++++++++ include/standard-headers/linux/input-event-codes.h | 3 +- include/standard-headers/linux/vhost_types.h | 11 ++ include/standard-headers/linux/virtio_9p.h | 4 +- include/standard-headers/linux/virtio_blk.h | 26 ++-- include/standard-headers/linux/virtio_config.h | 8 +- include/standard-headers/linux/virtio_console.h | 8 +- include/standard-headers/linux/virtio_net.h | 6 +- include/standard-headers/linux/virtio_scsi.h | 20 +-- linux-headers/asm-generic/unistd.h | 6 +- linux-headers/asm-mips/unistd_n32.h | 1 + linux-headers/asm-mips/unistd_n64.h | 1 + linux-headers/asm-mips/unistd_o32.h | 1 + linux-headers/asm-powerpc/kvm.h | 5 + linux-headers/asm-powerpc/unistd_32.h | 1 + linux-headers/asm-powerpc/unistd_64.h | 1 + linux-headers/asm-s390/kvm.h | 7 +- linux-headers/asm-s390/unistd_32.h | 1 + linux-headers/asm-s390/unistd_64.h | 1 + linux-headers/asm-x86/unistd_32.h | 1 + linux-headers/asm-x86/unistd_64.h | 1 + linux-headers/asm-x86/unistd_x32.h | 1 + linux-headers/linux/kvm.h | 10 +- linux-headers/linux/vfio.h | 17 ++- linux-headers/linux/vhost.h | 2 + 35 files changed, 554 insertions(+), 62 deletions(-) create mode 100644 hw/s390x/s390-pci-vfio.c create mode 100644 hw/s390x/s390-pci-vfio.h