Re: [PATCH V2 00/23] IOREQ feature (+ virtio-mmio) on Arm

[Oleksandr <olekstysh@xxxxxxxxx>]

On 02.11.20 09:23, Wei Chen wrote:
> Hi Oleksandr,
Hi Wei.


> Thanks for the sharing of virtio-disk backend. I have tested it on arm FVP_base 
> platform.
> We used domain-0 to run virtio disk backend. The backend disk is a loop device.
>      "virtio_disks": [
>          {
>              "backend_domname": "Domain-0",
>              "devid": 0,
>              "disks": [
>                  {
>                      "filename": "/dev/loop0"
>                  }
>              ]
>          }
>      ],
>
> It works fine and I've pasted some logs:
>
> -------------------------------------------
> Domain-0 logs:
> main: read backend domid 0
> (XEN) gnttab_mark_dirty not implemented yet
> (XEN) domain_direct_pl011_init for domain#2
> main: read frontend domid 2
>    Info: connected to dom2
>
> demu_seq_next: >XENSTORE_ATTACHED
> demu_seq_next: domid = 2
> demu_seq_next: filename[0] = /dev/loop0
> demu_seq_next: readonly[0] = 0
> demu_seq_next: base[0]     = 0x2000000
> demu_seq_next: irq[0]      = 33
> demu_seq_next: >XENCTRL_OPEN
> demu_seq_next: >XENEVTCHN_OPEN
> demu_seq_next: >XENFOREIGNMEMORY_OPEN
> demu_seq_next: >XENDEVICEMODEL_OPEN
> demu_initialize: 2 vCPU(s)
> demu_seq_next: >SERVER_REGISTERED
> demu_seq_next: ioservid = 0
> demu_seq_next: >RESOURCE_MAPPED
> demu_seq_next: shared_iopage = 0xffffae6de000
> demu_seq_next: buffered_iopage = 0xffffae6dd000
> demu_seq_next: >SERVER_ENABLED
> demu_seq_next: >PORT_ARRAY_ALLOCATED
> demu_seq_next: >EVTCHN_PORTS_BOUND
> demu_seq_next: VCPU0: 3 -> 7
> demu_seq_next: VCPU1: 5 -> 8
> demu_seq_next: >EVTCHN_BUF_PORT_BOUND
> demu_seq_next: 0 -> 9
> demu_register_memory_space: 2000000 - 20001ff
>    Info: (virtio/mmio.c) virtio_mmio_init:290: 
> mailto:virtio-mmio.devices=0x200@0x2000000:33
> demu_seq_next: >DEVICE_INITIALIZED
> demu_seq_next: >INITIALIZED
> IO request not ready
> IO request not ready
>
> ----------------
> Dom-U logs:
> [    0.491037] xen:xen_evtchn: Event-channel device installed
> [    0.493600] Initialising Xen pvcalls frontend driver
> [    0.516807] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
> [    0.525565] cacheinfo: Unable to detect cache hierarchy for CPU 0
> [    0.562275] brd: module loaded
> [    0.595300] loop: module loaded
> [    0.683800] virtio_blk virtio0: [vda] 131072 512-byte logical blocks (67.1 
> MB/64.0 MiB)
> [    0.684000] vda: detected capacity change from 0 to 67108864
>
>
> / # dd if=/dev/vda of=/dev/null bs=1M count=64
> 64+0 records in
> 64+0 records out
> 67108864 bytes (64.0MB) copied, 3.196242 seconds, 20.0MB/s
> / # dd if=/dev/zero of=/dev/vda bs=1M count=64
> 64+0 records in
> 64+0 records out
> 67108864 bytes (64.0MB) copied, 3.704594 seconds, 17.3MB/s
> ---------------------
>
> The read/write seems OK in dom-U. The FVP platform is a emulator, so the 
> performance is no reference.
> We will test it on real hardware like N1SDP.

This is really a good news. Thank you for testing!


--
Regards,

Oleksandr Tyshchenko