Re: [Xen-devel] Xen on ARMv8

[Vijay Kilari <vijay.kilari@xxxxxxxxx>]

On Thu, Dec 5, 2013 at 8:27 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Thu, 2013-12-05 at 20:21 +0530, Vijay Kilari wrote:
>> Hi Ian,
>>
>> Thanks for the information
>>
>>  I was successful to boot Xen on our ARMv8 simulator to some extent,
>> but facing following issues:
>>
>> 1) With Stable 4.3 version, Xen boots, but fails in ctxt_switch_from()
>>  call from schedule_tail().
>>     This happens to be because it does not support 64-bit guest. I was
>> using 64-bit guest
>
> 4.3 is probably not the best option for bringing up a new platform TBH.
>
>> 2) I see that staging branch has support for 64-bit guest, but it
>> fails to boot completely.
>>     I see continuous IRQ 37 which is not seen with stable version
>
> That's pretty strange. What is IRQ37 in your system?
>
> I know that Julien and Stefano are looking at some interrupt stuff, in
> particular there was a patch series way back in June which is currently
> been reworked titled "Fix multiple issues with the interrupts on ARM",
> of which "Only enable physical IRQs when the guest asks" sounds like it
> might be relevant given the symptom you describe.
>

IRQ 37 is uart interrupt. The problem is with the pl011 driver changes which
are not compatible with our ARMv8 simulator. After reverting changes to pl011
to inline with stable branch, issue is not seen. I will identify the exact patch
that is causing this problem later.

Now, I am facing problem with loading dom0 & dtb, the following is the console
output.

I have changed dom0_mem to 512MB instead of 128 MB
Can you please provide your quick comments on whats going wrong?
Looks like the Dom0 load address is wrong. Do I need to regenerate
Dom0 kernel with different address?

I am using Xen staging tag

(XEN) Using PSCI for SMP bringup
(XEN) Generic Timer IRQ: phys=30 hyp=26 virt=27
(XEN) Using generic timer at 100000 KHz
(XEN) GIC initialization:
(XEN)         gic_dist_addr=000000002c001000
(XEN)         gic_cpu_addr=000000002c002000
(XEN)         gic_hyp_addr=000000002c004000
(XEN)         gic_vcpu_addr=000000002c006000
(XEN)         gic_maintenance_irq=25
(XEN) GIC: 160 lines, 8 cpus, secure (IID a002104c).
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Allocated console ring of 16 KiB.
(XEN) Brought up 1 CPUs
(XEN) *** LOADING DOMAIN 0 ***
(XEN) Populate P2M 0xa0000000->0xc0000000 (1:1 mapping for dom0)
(XEN) Loading kernel from boot module 2
(XEN) elf_parse_binary: phdr: paddr=0xffffffc000080000 memsz=0x702518
(XEN) elf_parse_binary: memory: 0xffffffc000080000 -> 0xffffffc000782518
(XEN) elf_xen_addr_calc_check: VIRT_BASE unset, using 0x0
(XEN) elf_xen_addr_calc_check: ELF_PADDR_OFFSET unset, using 0x0
(XEN) elf_xen_addr_calc_check: addresses:
(XEN)     virt_base        = 0x0
(XEN)     elf_paddr_offset = 0x0
(XEN)     virt_offset      = 0x0
(XEN)     virt_kstart      = 0xffffffc000080000
(XEN)     virt_kend        = 0xffffffc000782518
(XEN)     virt_entry       = 0xffffffc000080020
(XEN)     p2m_base         = 0xffffffffffffffff
(XEN) Loading ELF image into guest memory
(XEN) elf_load_binary: phdr 0 at 0xffffffc000080000 -> 0xffffffc0006b0024
(XEN) Free temporary kernel buffer
(XEN) Loading dom0 DTB to 0xffffffc000800000-0xffffffc0008017f7
(XEN)
(XEN) ****************************************
(XEN) Panic on CPU 0:
(XEN) Unable to copy the DTB to dom0 memory (rc = 18446744073709551602)
(XEN) ****************************************

> Ian.
>
>>
>> Any comments?
>>
>> Regards
>> Vijay
>>
>>
>> On Fri, Nov 29, 2013 at 4:19 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
>> wrote:
>> > On Fri, 2013-11-29 at 13:20 +0530, Vijay Kilari wrote:
>> >> Hi,
>> >>
>> >>    I want to try Xen on ARMv8 Simulator.
>> >> Can you please provide guidance?. I am looking for
>> >> information about sources, build and procedure to
>> >> launch Xen on ARMv8
>> >
>> > http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions is the
>> > place to start from.
>> >
>> > Ian.
>> >
>
>

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