Hi,
Since upgrading to Petalinux 2020.2 I am getting unhandled context faults when trying to start a xen domU (guest) with a SD card partition as virtual disk. It works if i instead move the same partition into a ramdisk and boot with it, so it seems like there is something wrong with the SD card driver. The domU is booted from a dom0 with the command 'xl create -c -f guest0.cfg', and the .cfg contains the line 'disk = ["/dev/mmcblk0p3,,hda,rw"]' which causes the error. The disk command is documented here http://xenbits.xenproject.org/docs/4.13-testing/man/xl-disk-configuration.5.html , but the same command worked in Petalinux 2019.2 so it seems to correct.
I get this error repeatedly:
(XEN) smmu: /smmu@fd800000: Unhandled context fault: fsr=0x402, iova=0x4c5398000, fsynr=0x80012, cb=0
[ 89.506913] mmc0: Timeout waiting for hardware interrupt.
[ 89.506972] mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
[ 89.513258] mmc0: sdhci: Sys addr: 0x00000000 | Version: 0x00001002
[ 89.519743] mmc0: sdhci: Blk size: 0x00007200 | Blk cnt: 0x00000000
[ 89.526231] mmc0: sdhci: Argument: 0x019c1000 | Trn mode: 0x00000013
[ 89.532718] mmc0: sdhci: Present: 0x01f70206 | Host ctl: 0x0000001f
[ 89.539206] mmc0: sdhci: Power: 0x0000000f | Blk gap: 0x00000080
[ 89.545693] mmc0: sdhci: Wake-up: 0x00000000 | Clock: 0x00000207
[ 89.552181] mmc0: sdhci: Timeout: 0x00000004 | Int stat: 0x00000000
[ 89.558668] mmc0: sdhci: Int enab: 0x03ff008b | Sig enab: 0x03ff008b
[ 89.565156] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000000
[ 89.571643] mmc0: sdhci: Caps: 0x31e8c881 | Caps_1: 0x00002007
[ 89.578131] mmc0: sdhci: Cmd: 0x0000113a | Max curr: 0x00000000
[ 89.584618] mmc0: sdhci: Resp[0]: 0x00000900 | Resp[1]: 0x478008f0
[ 89.591106] mmc0: sdhci: Resp[2]: 0x53433136 | Resp[3]: 0x00035344
[ 89.597592] mmc0: sdhci: Host ctl2: 0x00000001
[ 89.602092] mmc0: sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x00000004e863520c
[ 89.609270] mmc0: sdhci: ============================================
[ 89.619234] blk_update_request: I/O error, dev mmcblk0, sector 27004928 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
I already tried some things in the dom0 (host) kernel config regarding the SD card driver config, but to no success until now.
Petalinux 2020.2 is using Xen 4.13.0 while Petalinux 2019.2 was using Xen 4.11.2-pre, but i don't think there is something wrong with Xen as it boots with a ramdisk without problems (with this .cfg line: 'disk = ["/dev/ram0,,hda,rw"]'). Nonetheless for anyone interested, here is the output of my xl info:
root@xenhost:~# xl info
host : xenhost
release : 5.4.0-xilinx-v2020.2
version : #1 SMP Tue Jan 12 10:37:11 UTC 2021
machine : aarch64
nr_cpus : 4
max_cpu_id : 3
nr_nodes : 1
cores_per_socket : 1
threads_per_core : 1
cpu_mhz : 100.000
hw_caps : 00000000:00000000:00000000:00000000:00000000:00000000:00000000:00000000
virt_caps : hvm hvm_directio hap iommu_hap_pt_share
total_memory : 6143
free_memory : 1917
sharing_freed_memory : 0
sharing_used_memory : 0
outstanding_claims : 0
free_cpus : 0
xen_major : 4
xen_minor : 13
xen_extra : .0
xen_version : 4.13.0
xen_caps : xen-3.0-aarch64 xen-3.0-armv7l
xen_scheduler : null
xen_pagesize : 4096
platform_params : virt_start=0x200000
xen_changeset : Tue Sep 29 15:34:31 2020 -0700 git:dfa58d1a3f-dirty
xen_commandline : console=dtuart dtuart=serial0 dom0_mem=4G dom0_max_vcpus=1 bootscrub=0 vwfi=native sched=null
cc_compiler : aarch64-xilinx-linux-gcc (GCC) 9.2.0
cc_compile_by : SKYNETorych
cc_compile_domain : skynet.internal
cc_compile_date : Tue Jan 12 10:36:45 UTC 2021
build_id : 7b82382a3f2346f4b283bdc3cccd44a3003517a4
xend_config_format : 4
I don't know what those values in the context fault error message are supposed to mean, maybe somebody can help me with that?
Thanks.
