Re: [Xen-devel] Pygrub on ARM64

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 25 Feb 2016, Ian Campbell wrote:
> On Thu, 2016-02-25 at 13:20 +0530, Sanjeev Pandita wrote:
> > 
> > Terminal 3: (manually running the pygrub command)
> > [root@dhcp-194 xen]# export LD_LIBRARY_PATH=/usr/lib
> > [root@dhcp-194 xen]# mkdir -p /var/run/xen/bootloader.2.d
> > [root@dhcp-194 xen]# touch /var/run/xen/bootloader.2.out
> > [root@dhcp-194 xen]# /usr/lib/xen/bin/pygrub --args="root=/dev/xvda4 rw
> > console=hvc0 earlyprintk=xen" --output=/var/run/xen/bootloader.2.out --
> > output-format=simple0 --output-directory=/var/run/xen/bootloader.2.d
> > /mnt/xen/CentOS-7-aarch64.img
> > 
> > (nothing comes on console after this) 
> 
> I don't remember ever seeing pygrub fail silently in this way.
> 
> I think at this point I would be trying a few different things, firstly
> using strace(1) on the pygrub invocation to see if I could see where it was
> blocked. I think you can drop all of the arguments except for the image,
> e.g.
> 
>     pygrub /mnt/xen/CentOS-7-aarch64.img
> 
> leading to
> 
>     strace -o pygrub.strace pygrub /mnt/xen/CentOS-7-aarch64.img
> 
> (maybe add -fff if it looks to be using threads)
> 
> Secondly manually mounting CentOS-7-aarch64.img (e.g. "mount -o loop etc",
> or maybe kpartx -a first if the image has a partition table) to check it
> really is some sort of sensible/readable image.

CentOS's first partition is fat to boot on efi systems, but it only
contains the grub efi binary. All the other partitions are xfs. Does
pygrub support it?



I know that's know what you asked, but alternatively you could use
Tianocore to boot the the guest, which usually works pretty well. You
need to specify:

kernel="/path/to/XEN_EFI.fd"

in your VM config, where XEN_EFI.fd is your tianocore arm64 binary.
You can build Tianocore on arm64 with Xen support with the following
runes:

source edksetup.sh
build -a AARCH64 -t GCC48 -p ArmVirtPkg/ArmVirtXen.dsc -b RELEASE

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