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e8sm814103pga.17.2019.11.12.20.54.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 12 Nov 2019 20:54:17 -0800 (PST) Subject: Re: virtio,iommu_platform=on To: Laszlo Ersek , qemu-devel@nongnu.org References: <17da2769-1999-a0a3-590d-9f9bc6a9adc3@ozlabs.ru> <9204f8a7-0dfa-b689-7f97-5997d3298fdd@redhat.com> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 t847eFaVKI/6WcxhszI0R6Cj+N4y+1rHfkGWYWupCiHwj9DjILW9iEAncVgQmkNPpUsZECLT WQzMuVSxjuXW4nJ6f4OFHqL2dU//qR+BM/eJ0TT3OnfLcPqfucGxubhT7n/CXUxEy+mvWwnm s9p4uqVpTfEuzQ0/bE6t7dZdPBua7eYox1AQnk8JQDwC3Rn9kZq2O7u5KuJP5MfludMmQevm 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x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <9204f8a7-0dfa-b689-7f97-5997d3298fdd@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::543 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: "Michael S. Tsirkin" , David Gibson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 12/11/2019 20:06, Laszlo Ersek wrote: > On 11/12/19 04:53, Alexey Kardashevskiy wrote: >> Hi! >> >> I am enabling IOMMU for virtio in the pseries firmware (SLOF) and seeing >> problems, one of them is SLOF does SCSI bus scan, then it stops the >> virtio-scsi by clearing MMIO|IO|BUSMASTER from PCI_COMMAND (as SLOF >> stopped using the devices) and when this happens, I see unassigned >> memory access (see below) which happens because disabling busmaster >> disables IOMMU and QEMU cannot access the rings to do some shutdown. And >> when this happens, the device does not come back even if SLOF re-enables it. >> >> Hacking SLOF to not clear BUSMASTER makes virtio-scsi work but it is >> hardly a right fix. >> >> Is this something expected? Thanks, > > Can you perform a virtio reset (write 0 to the virtio-scsi-pci device's > virtio status register) in SLOF, before clearing PCI_COMMAND? The device stops working in SLOF, even if I do not remove bus master bit ever. Weird... > > Thanks, > Laszlo > > >> >> >> Here is the exact command line: >> >> /home/aik/pbuild/qemu-garrison2-ppc64/ppc64-softmmu/qemu-system-ppc64 \ >> >> -nodefaults \ >> >> -chardev stdio,id=STDIO0,signal=off,mux=on \ >> >> -device spapr-vty,id=svty0,reg=0x71000110,chardev=STDIO0 \ >> >> -mon id=MON0,chardev=STDIO0,mode=readline \ >> >> -nographic \ >> >> -vga none \ >> >> -enable-kvm \ >> -m 2G \ >> >> -device >> virtio-scsi-pci,id=vscsi0,iommu_platform=on,disable-modern=off,disable-legacy=on >> \ >> -drive id=DRIVE0,if=none,file=img/u1804-64le.qcow2,format=qcow2 \ >> >> -device scsi-disk,id=scsi-disk0,drive=DRIVE0 \ >> >> -snapshot \ >> >> -smp 1 \ >> >> -machine pseries \ >> >> -L /home/aik/t/qemu-ppc64-bios/ \ >> >> -trace events=qemu_trace_events \ >> >> -d guest_errors \ >> >> -chardev socket,id=SOCKET0,server,nowait,path=qemu.mon.ssh59518 \ >> >> -mon chardev=SOCKET0,mode=control >> >> >> >> Here is the backtrace: >> >> Thread 5 "qemu-system-ppc" hit Breakpoint 8, unassigned_mem_accepts >> (opaque=0x0, addr=0x5802, size=0x2, is_write=0x0, attrs=...) at /home/ >> aik/p/qemu/memory.c:1275 >> 1275 return false; >> #0 unassigned_mem_accepts (opaque=0x0, addr=0x5802, size=0x2, >> is_write=0x0, attrs=...) at /home/aik/p/qemu/memory.c:1275 >> #1 0x00000000100a8ac8 in memory_region_access_valid (mr=0x1105c230 >> , addr=0x5802, size=0x2, is_write=0x0, attrs=...) at >> /home/aik/p/qemu/memory.c:1377 >> #2 0x00000000100a8c88 in memory_region_dispatch_read (mr=0x1105c230 >> , addr=0x5802, pval=0x7ffff550d410, op=MO_16, >> attrs=...) at /home/aik/p/qemu/memory.c:1418 >> #3 0x000000001001cad4 in address_space_lduw_internal_cached_slow >> (cache=0x7fff68036fa0, addr=0x2, attrs=..., result=0x0, >> endian=DEVICE_LITTLE_ENDIAN) at /home/aik/p/qemu/memory_ldst.inc.c:211 >> #4 0x000000001001cc84 in address_space_lduw_le_cached_slow >> (cache=0x7fff68036fa0, addr=0x2, attrs=..., result=0x0) at >> /home/aik/p/qemu/memory_ldst.inc.c:249 >> #5 0x000000001019bd80 in address_space_lduw_le_cached >> (cache=0x7fff68036fa0, addr=0x2, attrs=..., result=0x0) at >> /home/aik/p/qemu/include/exec/memory_ldst_cached.inc.h:56 >> #6 0x000000001019c10c in lduw_le_phys_cached (cache=0x7fff68036fa0, >> addr=0x2) at /home/aik/p/qemu/include/exec/memory_ldst_phys.inc.h:91 >> #7 0x000000001019d86c in virtio_lduw_phys_cached (vdev=0x118b9110, >> cache=0x7fff68036fa0, pa=0x2) at >> /home/aik/p/qemu/include/hw/virtio/virtio-access.h:166 >> #8 0x000000001019e648 in vring_avail_idx (vq=0x118c2720) at >> /home/aik/p/qemu/hw/virtio/virtio.c:302 >> #9 0x000000001019f5bc in virtio_queue_split_empty (vq=0x118c2720) at >> /home/aik/p/qemu/hw/virtio/virtio.c:581 >> #10 0x000000001019f838 in virtio_queue_empty (vq=0x118c2720) at >> /home/aik/p/qemu/hw/virtio/virtio.c:612 >> #11 0x00000000101a8fa8 in virtio_queue_host_notifier_aio_poll >> (opaque=0x118c2798) at /home/aik/p/qemu/hw/virtio/virtio.c:3389 >> #12 0x000000001092679c in run_poll_handlers_once (ctx=0x11212e40, >> timeout=0x7ffff550d7d8) at /home/aik/p/qemu/util/aio-posix.c:520 >> #13 0x0000000010926aec in try_poll_mode (ctx=0x11212e40, >> timeout=0x7ffff550d7d8) at /home/aik/p/qemu/util/aio-posix.c:607 >> #14 0x0000000010926c2c in aio_poll (ctx=0x11212e40, blocking=0x1) at >> /home/aik/p/qemu/util/aio-posix.c:639 >> #15 0x000000001091fe0c in aio_wait_bh_oneshot (ctx=0x11212e40, >> cb=0x1016f35c , opaque=0x118b9110) at >> /home/aik/p/qemu/util/aio-wait.c:71 >> #16 0x000000001016fa60 in virtio_scsi_dataplane_stop (vdev=0x118b9110) >> at /home/aik/p/qemu/hw/scsi/virtio-scsi-dataplane.c:211 >> #17 0x0000000010684740 in virtio_bus_stop_ioeventfd (bus=0x118b9098) at >> /home/aik/p/qemu/hw/virtio/virtio-bus.c:245 >> #18 0x0000000010688290 in virtio_pci_stop_ioeventfd (proxy=0x118b0fa0) >> at /home/aik/p/qemu/hw/virtio/virtio-pci.c:292 >> #19 0x00000000106891e8 in virtio_write_config (pci_dev=0x118b0fa0, >> address=0x4, val=0x100100, len=0x4) at >> /home/aik/p/qemu/hw/virtio/virtio-pci.c:613 >> #20 0x00000000105b7228 in pci_host_config_write_common >> (pci_dev=0x118b0fa0, addr=0x4, limit=0x100, val=0x100100, len=0x4) at >> /home/aik/p/qemu/hw/pci/pci_host.c:81 >> #21 0x00000000101f7bdc in finish_write_pci_config (spapr=0x11217200, >> buid=0x800000020000000, addr=0x4, size=0x4, val=0x100100, >> rets=0x7e7533e0) at /home/aik/p/qemu/hw/ppc/spapr_pci.c:192 >> #22 0x00000000101f7cec in rtas_ibm_write_pci_config (cpu=0x11540df0, >> spapr=0x11217200, token=0x2017, nargs=0x5, args=0x7e7533cc, nret=0x1, >> rets=0x7e7533e0) at /home/aik/p/qemu/hw/ppc/spapr_pci.c:216 >> #23 0x00000000101f5860 in spapr_rtas_call (cpu=0x11540df0, >> spapr=0x11217200, token=0x2017, nargs=0x5, args=0x7e7533cc, nret=0x1, >> rets=0x7e7533e0) at /home/aik/p/qemu/hw/ppc/spapr_rtas.c:416 >> #24 0x00000000101ee214 in h_rtas (cpu=0x11540df0, spapr=0x11217200, >> opcode=0xf000, args=0x7ffff4cf0030) at >> /home/aik/p/qemu/hw/ppc/spapr_hcall.c:1214 >> #25 0x00000000101f0524 in spapr_hypercall (cpu=0x11540df0, >> opcode=0xf000, args=0x7ffff4cf0030) at >> /home/aik/p/qemu/hw/ppc/spapr_hcall.c:2014 >> #26 0x000000001033bff0 in kvm_arch_handle_exit (cs=0x11540df0, >> run=0x7ffff4cf0000) at /home/aik/p/qemu/target/ppc/kvm.c:1684 >> #27 0x00000000100cc7c8 in kvm_cpu_exec (cpu=0x11540df0) at >> /home/aik/p/qemu/accel/kvm/kvm-all.c:2391 >> #28 0x000000001008edf8 in qemu_kvm_cpu_thread_fn (arg=0x11540df0) at >> /home/aik/p/qemu/cpus.c:1318 >> #29 0x000000001092c704 in qemu_thread_start (args=0x11588d90) at >> /home/aik/p/qemu/util/qemu-thread-posix.c:519 >> #30 0x00007ffff7b58070 in start_thread (arg=0x7ffff550ebf0) at >> pthread_create.c:335 >> #31 0x00007ffff7aa3a70 in clone () at >> ../sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S:96 >> (gdb) >> > -- Alexey