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vl.c: fix memleaks with g_strdup+strtok #36
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Signed-off-by: Quentin Perez <qperez@ocs.online.net>
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Make lr.w and sc.w do sign extension. Fixes riscvarchive/riscv-gcc#23
Don't overwite pselect's return value when copying out fdsets.
checkpatch reminds us that statics shouldn't be zero-initialized: ERROR: do not initialise statics to 0 or NULL #35: FILE: vl.c:157: +static int num_serial_hds = 0; ERROR: do not initialise statics to 0 or NULL #36: FILE: vl.c:158: +static Chardev **serial_hds = NULL; I forgot to fix this in 6af2692; do so now. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Thomas Huth <thuth@redhat.com> Message-id: 20180426140253.3918-1-peter.maydell@linaro.org
Both virtio-blk and virtio-scsi use virtio_queue_empty() as the loop condition in VQ handlers (virtio_blk_handle_vq, virtio_scsi_handle_cmd_vq). When a device is marked broken in virtqueue_pop, for example if a vIOMMU address translation failed, we want to break out of the loop. This fixes a hanging problem when booting a CentOS 3.10.0-862.el7.x86_64 kernel: $ qemu-system-x86_64 \ ... \ -device intel-iommu,intremap=on,caching-mode=on,eim=on,device-iotlb=on \ -device virtio-scsi-pci,iommu_platform=on,ats=on,id=scsi0,bus=pci.4,addr=0x0 The dead loop happens immediately when the kernel boots and initializes the device, where virtio_scsi_data_plane_handle_cmd will not return: > ... > qemu#13 0x00005586602b7793 in virtio_scsi_handle_cmd_vq > qemu#14 0x00005586602b8d66 in virtio_scsi_data_plane_handle_cmd > qemu#15 0x00005586602ddab7 in virtio_queue_notify_aio_vq > qemu#16 0x00005586602dfc9f in virtio_queue_host_notifier_aio_poll > qemu#17 0x00005586607885da in run_poll_handlers_once > qemu#18 0x000055866078880e in try_poll_mode > qemu#19 0x00005586607888eb in aio_poll > qemu#20 0x0000558660784561 in aio_wait_bh_oneshot > qemu#21 0x00005586602b9582 in virtio_scsi_dataplane_stop > qemu#22 0x00005586605a7110 in virtio_bus_stop_ioeventfd > qemu#23 0x00005586605a9426 in virtio_pci_stop_ioeventfd > qemu#24 0x00005586605ab808 in virtio_pci_common_write > qemu#25 0x0000558660242396 in memory_region_write_accessor > qemu#26 0x00005586602425ab in access_with_adjusted_size > qemu#27 0x0000558660245281 in memory_region_dispatch_write > qemu#28 0x00005586601e008e in flatview_write_continue > qemu#29 0x00005586601e01d8 in flatview_write > qemu#30 0x00005586601e04de in address_space_write > qemu#31 0x00005586601e052f in address_space_rw > qemu#32 0x00005586602607f2 in kvm_cpu_exec > qemu#33 0x0000558660227148 in qemu_kvm_cpu_thread_fn > qemu#34 0x000055866078bde7 in qemu_thread_start > qemu#35 0x00007f5784906594 in start_thread > qemu#36 0x00007f5784639e6f in clone With this patch, virtio_queue_empty will now return 1 as soon as the vdev is marked as broken, after a "virtio: zero sized buffers are not allowed" error. To be consistent, update virtio_queue_empty_rcu as well. Signed-off-by: Fam Zheng <famz@redhat.com> --- v2: - Drop ATS condition from the patch description since it is not essential. - Drop patch 2. [Paolo]
Both virtio-blk and virtio-scsi use virtio_queue_empty() as the loop condition in VQ handlers (virtio_blk_handle_vq, virtio_scsi_handle_cmd_vq). When a device is marked broken in virtqueue_pop, for example if a vIOMMU address translation failed, we want to break out of the loop. This fixes a hanging problem when booting a CentOS 3.10.0-862.el7.x86_64 kernel with ATS enabled: $ qemu-system-x86_64 \ ... \ -device intel-iommu,intremap=on,caching-mode=on,eim=on,device-iotlb=on \ -device virtio-scsi-pci,iommu_platform=on,ats=on,id=scsi0,bus=pci.4,addr=0x0 The dead loop happens immediately when the kernel boots and initializes the device, where virtio_scsi_data_plane_handle_cmd will not return: > ... > #13 0x00005586602b7793 in virtio_scsi_handle_cmd_vq > #14 0x00005586602b8d66 in virtio_scsi_data_plane_handle_cmd > #15 0x00005586602ddab7 in virtio_queue_notify_aio_vq > #16 0x00005586602dfc9f in virtio_queue_host_notifier_aio_poll > #17 0x00005586607885da in run_poll_handlers_once > #18 0x000055866078880e in try_poll_mode > #19 0x00005586607888eb in aio_poll > #20 0x0000558660784561 in aio_wait_bh_oneshot > #21 0x00005586602b9582 in virtio_scsi_dataplane_stop > #22 0x00005586605a7110 in virtio_bus_stop_ioeventfd > #23 0x00005586605a9426 in virtio_pci_stop_ioeventfd > #24 0x00005586605ab808 in virtio_pci_common_write > #25 0x0000558660242396 in memory_region_write_accessor > #26 0x00005586602425ab in access_with_adjusted_size > #27 0x0000558660245281 in memory_region_dispatch_write > #28 0x00005586601e008e in flatview_write_continue > #29 0x00005586601e01d8 in flatview_write > #30 0x00005586601e04de in address_space_write > #31 0x00005586601e052f in address_space_rw > #32 0x00005586602607f2 in kvm_cpu_exec > #33 0x0000558660227148 in qemu_kvm_cpu_thread_fn > #34 0x000055866078bde7 in qemu_thread_start > #35 0x00007f5784906594 in start_thread > #36 0x00007f5784639e6f in clone With this patch, virtio_queue_empty will now return 1 as soon as the vdev is marked as broken, after a "virtio: zero sized buffers are not allowed" error. To be consistent, update virtio_queue_empty_rcu as well. Signed-off-by: Fam Zheng <famz@redhat.com> Message-Id: <20180910145616.8598-2-famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Both virtio-blk and virtio-scsi use virtio_queue_empty() as the loop condition in VQ handlers (virtio_blk_handle_vq, virtio_scsi_handle_cmd_vq). When a device is marked broken in virtqueue_pop, for example if a vIOMMU address translation failed, we want to break out of the loop. This fixes a hanging problem when booting a CentOS 3.10.0-862.el7.x86_64 kernel with ATS enabled: $ qemu-system-x86_64 \ ... \ -device intel-iommu,intremap=on,caching-mode=on,eim=on,device-iotlb=on \ -device virtio-scsi-pci,iommu_platform=on,ats=on,id=scsi0,bus=pci.4,addr=0x0 The dead loop happens immediately when the kernel boots and initializes the device, where virtio_scsi_data_plane_handle_cmd will not return: > ... > qemu#13 0x00005586602b7793 in virtio_scsi_handle_cmd_vq > qemu#14 0x00005586602b8d66 in virtio_scsi_data_plane_handle_cmd > qemu#15 0x00005586602ddab7 in virtio_queue_notify_aio_vq > qemu#16 0x00005586602dfc9f in virtio_queue_host_notifier_aio_poll > qemu#17 0x00005586607885da in run_poll_handlers_once > qemu#18 0x000055866078880e in try_poll_mode > qemu#19 0x00005586607888eb in aio_poll > qemu#20 0x0000558660784561 in aio_wait_bh_oneshot > qemu#21 0x00005586602b9582 in virtio_scsi_dataplane_stop > qemu#22 0x00005586605a7110 in virtio_bus_stop_ioeventfd > qemu#23 0x00005586605a9426 in virtio_pci_stop_ioeventfd > qemu#24 0x00005586605ab808 in virtio_pci_common_write > qemu#25 0x0000558660242396 in memory_region_write_accessor > qemu#26 0x00005586602425ab in access_with_adjusted_size > qemu#27 0x0000558660245281 in memory_region_dispatch_write > qemu#28 0x00005586601e008e in flatview_write_continue > qemu#29 0x00005586601e01d8 in flatview_write > qemu#30 0x00005586601e04de in address_space_write > qemu#31 0x00005586601e052f in address_space_rw > qemu#32 0x00005586602607f2 in kvm_cpu_exec > qemu#33 0x0000558660227148 in qemu_kvm_cpu_thread_fn > qemu#34 0x000055866078bde7 in qemu_thread_start > qemu#35 0x00007f5784906594 in start_thread > qemu#36 0x00007f5784639e6f in clone With this patch, virtio_queue_empty will now return 1 as soon as the vdev is marked as broken, after a "virtio: zero sized buffers are not allowed" error. To be consistent, update virtio_queue_empty_rcu as well. Signed-off-by: Fam Zheng <famz@redhat.com> Message-Id: <20180910145616.8598-2-famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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