Porting Xen to Jetson Nano

["Srinivas Bangalore" <srini@yujala.com>]

[-- Attachment #1: Type: text/plain, Size: 5408 bytes --]

Hello,

 

I am trying to get Xen working on a Jetson Nano board (which is based on
NVIDIA's Tegra210 SoC). After some searching through the Xen-devel archives,
I learnt that there was a set of patches developed in 2017 to port Xen to
Tegra
(https://lists.xenproject.org/archives/html/xen-devel/2017-04/msg00991.html)
. However these patches don't appear in the main source repository.
Therefore, I applied these manually to Xen-4.8.5. With these changes, Xen
now boots up successfully on the Jetson Nano, but there is no Dom0 output on
the console. I can switch between Xen and Dom0 with CTRL-a-a-a.

 

I am using Linux kernel version 5.7 for Dom0. I also tried using the native
Linux kernel that comes with the Nano board, but that doesn't help.

 

Here's the console screen capture:

 

## Flattened Device Tree blob at e3000000

   Booting using the fdt blob at 0xe3000000

   reserving fdt memory region: addr=80000000 size=20000

   reserving fdt memory region: addr=e3000000 size=35000

   Loading Device Tree to 00000000fc7f8000, end 00000000fc82ffff ... OK

 

Starting kernel ...

 

- UART enabled -

- CPU 00000000 booting -

- Current EL 00000008 -

- Xen starting at EL2 -

- Zero BSS -

- Setting up control registers -

- Turning on paging -

- Ready -

(XEN) Checking for initrd in /chosen

(XEN) linux,initrd limits invalid: 0000000084100000 >= 0000000084100000

(XEN) RAM: 0000000080000000 - 00000000fedfffff

(XEN) RAM: 0000000100000000 - 000000017f1fffff

(XEN)

(XEN) MODULE[0]: 00000000fc7f8000 - 00000000fc82d000 Device Tree

(XEN) MODULE[1]: 00000000e1000000 - 00000000e2cbe200 Kernel
console=hvc0 earlyprintk=uart8250-32bit,0x70006000 rootfstype=ext4 rw
rootwait root=/dev/mmcblk0p1

(XEN)  RESVD[0]: 0000000080000000 - 0000000080020000

(XEN)  RESVD[1]: 00000000e3000000 - 00000000e3035000

(XEN)  RESVD[2]: 00000000fc7f8000 - 00000000fc82d000

(XEN)

(XEN) Command line: console=dtuart earlyprintk=xen earlycon=xenboot
dom0_mem=512M loglevel=all

(XEN) Placing Xen at 0x00000000fec00000-0x00000000fee00000

(XEN) Update BOOTMOD_XEN from 0000000080080000-0000000080188e01 =>
00000000fec00000-00000000fed08e01

(XEN) Domain heap initialised

(XEN) Taking dtuart configuration from /chosen/stdout-path

(XEN) Looking for dtuart at "/serial@70 Xen 4.8.5

(XEN) Xen version 4.8.5 (srinivas@) (aarch64-linux-gnu-gcc (Ubuntu/Linaro
7.5.0-3ubuntu1~18.04) 7.5.0) debug=n  Sun Jul 19 07:44:00 PDT 2020

(XEN) Latest ChangeSet:

(XEN) Processor: 411fd071: "ARM Limited", variant: 0x1, part 0xd07, rev 0x1

(XEN) 64-bit Execution:

(XEN)   Processor Features: 0000000000002222 0000000000000000

(XEN)     Exception Levels: EL3:64+32 EL2:64+32 EL1:64+32 EL0:64+32

(XEN)     Extensions: FloatingPoint AdvancedSIMD

(XEN)   Debug Features: 0000000010305106 0000000000000000

(XEN)   Auxiliary Features: 0000000000000000 0000000000000000

(XEN)   Memory Model Features: 0000000000001124 0000000000000000

(XEN)   ISA Features:  0000000000011120 0000000000000000

(XEN) 32-bit Execution:

(XEN)   Processor Features: 00000131:00011011

(XEN)     Instruction Sets: AArch32 A32 Thumb Thumb-2 Jazelle

(XEN)     Extensions: GenericTimer Security

(XEN)   Debug Features: 03010066

(XEN)   Auxiliary Features: 00000000

(XEN)   Memory Model Features: 10101105 40000000 01260000 02102211

(XEN)  ISA Features: 02101110 13112111 21232042 01112131 00011142 00011121

(XEN) Generic Timer IRQ: phys=30 hyp=26 virt=27 Freq: 19200 KHz

(XEN) GICv2 initialization:

(XEN)         gic_dist_addr=0000000050041000

(XEN)         gic_cpu_addr=0000000050042000

(XEN)         gic_hyp_addr=0000000050044000

(XEN)         gic_vcpu_addr=0000000050046000

(XEN)         gic_maintenance_irq=25

(XEN) GICv2: 224 lines, 4 cpus, secure (IID 0200143b).

(XEN) Using scheduler: SMP Credit Scheduler (credit)

(XEN) Allocated console ring of 16 KiB.

(XEN) Bringing up CPU1

- CPU 00000001 booting -

- Current EL 00000008 -

- Xen starting at EL2 -

- Setting up control registers -

- Turning on paging -

- Ready -

(XEN) Bringing up CPU2

- CPU 00000002 booting -

- Current EL 00000008 -

- Xen starting at EL2 -

- Setting up control registers -

- Turning on paging -

- Ready -

(XEN) Bringing up CPU3

- CPU 00000003 booting -

- Current EL 00000008 -

- Xen starting at EL2 -

- Setting up control registers -

- Turning on paging -

- Ready -

(XEN) Brought up 4 CPUs

(XEN) P2M: 44-bit IPA with 44-bit PA

(XEN) P2M: 4 levels with order-0 root, VTCR 0x80043594

(XEN) I/O virtualisation disabled

(XEN) *** LOADING DOMAIN 0 ***

(XEN) Loading kernel from boot module @ 00000000e1000000

(XEN) Allocating 1:1 mappings totalling 512MB for dom0:

(XEN) BANK[0] 0x000000a0000000-0x000000c0000000 (512MB)

(XEN) Grant table range: 0x000000fec00000-0x000000fec60000

(XEN) Loading zImage from 00000000e1000000 to
00000000a0080000-00000000a1d3e200

(XEN) Allocating PPI 16 for event channel interrupt

(XEN) Loading dom0 DTB to 0x00000000a8000000-0x00000000a8034354

(XEN) Scrubbing Free RAM on 1 nodes using 4 CPUs

(XEN) ........done.

(XEN) Initial low memory virq threshold set at 0x4000 pages.

(XEN) Std. Loglevel: Errors and warnings

(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)

(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to
Xen)

(XEN) Freed 300kB init memory.

 

Any suggestions/pointers to move forward would be much appreciated.

 

Thanks,

Srini


[-- Attachment #2: Type: text/html, Size: 11325 bytes --]