Re: [PATCH 0/4] xen/arm: Unbreak ACPI

[Julien Grall <julien@xxxxxxx>]

Hello,

On 08/10/2020 19:39, Elliott Mitchell wrote:
> On Mon, Sep 28, 2020 at 03:47:52PM +0900, Masami Hiramatsu wrote:
> > This made progress with my Xen boot on DeveloperBox (
> > https://www.96boards.org/product/developerbox/ ) with ACPI.
> Adding your patch on top of Julien Grall's patch appears to push the Xen
> boot of my target device (Raspberry PI 4B with Tianocore) further.  Still
> yet to see any output attributable to the Domain 0 kernel though.
>
> (XEN) *** LOADING DOMAIN 0 ***
> (XEN) Loading d0 kernel from boot module @ 0000000032234000
> (XEN) Loading ramdisk from boot module @ 0000000031747000
> (XEN) Allocating 1:1 mappings totalling 2048MB for dom0:
> (XEN) BANK[0] 0x00000020000000-0x00000030000000 (256MB)
> (XEN) BANK[1] 0x00000040000000-0x000000b0000000 (1792MB)
> (XEN) Grant table range: 0x000000315f3000-0x00000031633000
> (XEN) Allocating PPI 16 for event channel interrupt
> (XEN) Loading zImage from 0000000032234000 to 0000000020080000-0000000021359200
> (XEN) Loading d0 initrd from 0000000031747000 to 
> 0x0000000028200000-0x0000000028cebfe4
> (XEN) Loading d0 DTB to 0x0000000028000000-0x0000000028000273
> (XEN) Initial low memory virq threshold set at 0x4000 pages.
> (XEN) Scrubbing Free RAM in background
> (XEN) Std. Loglevel: All
> (XEN) Guest Loglevel: All
> (XEN) *** Serial input to DOM0 (type 'CTRL-a' three times to switch input)
> (XEN) Freed 396kB init memory.
>
> The line, "Loading d0 DTB to 0x0000000028000000-0x0000000028000273" seems
> rather suspicious as I would expect Domain 0 to see ACPI tables, not a
> device tree.
This is normal, we are creating a small device-tree to pass some 
information to dom0 (such as the ACPI tables, command line, initrd).
> Your (Masami Hiramatsu) patch seems plausible, but things haven't
> progressed enough for me to endorse it.  Looks like something closer to
> the core of ACPI still needs further work, Julien Grall?
I didn't go very far during my testing because QEMU is providing ACPI 
5.1 (Xen only supports 6.0+ so far).
For your log above, Xen finished to boot and now dom0 should start 
booting. The lack of console output may be because of a crash in Linux 
during earlyboot.
Do you have the early console enabled Linux? This can be done by adding 
earlycon=xenboot on the Linux command line.
Cheers,

--
Julien Grall