Re: [Xen-devel] [GSoC] Xen on ARM: create multiple guests from device tree

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

Hi Luca,

please don't use HTML emails.


On Wed, 22 Mar 2017, Julien Grall wrote:
> On 22/03/2017 19:45, Luca Miccio wrote:
> > Hi Stefano,
> 
> Hello Luca,
> 
> > aarch64-linux-gnu-gcc  -DCNTFRQ=0x01800000-DUART_BASE=0x1c090000
> > -DSYSREGS_BASE=0x1c010000 -DGIC_DIST_BASE=0x2c001000
> > -DGIC_CPU_BASE=0x2c002000 -c -o boot.xen.o boot.S -DXEN
> > aarch64-linux-gnu-gcc  -DPHYS_OFFSET=0x80000000 -DMBOX_OFFSET=0xfff8
> > -DBOOT=boot.xen.o -DXEN_OFFSET=0xA00000 -DKERNEL_OFFSET=0x80000
> > -DFDT_OFFSET=0x08000000 -DFS_OFFSET=0x10000000 -DXEN=Xen -DKERNEL=Image
> > -DFILESYSTEM=filesystem.cpio.gz -E -P -C -o model.xen.lds model.lds.S
> > aarch64-linux-gnu-gcc  -DCNTFRQ=0x01800000-DUART_BASE=0x1c090000
> > -DSYSREGS_BASE=0x1c010000 -DGIC_DIST_BASE=0x2c001000
> > -DGIC_CPU_BASE=0x2c002000 -c -o boot.o boot.S
> > aarch64-linux-gnu-gcc  -DPHYS_OFFSET=0x80000000 -DMBOX_OFFSET=0xfff8
> > -DBOOT=boot.o -DKERNEL_OFFSET=0x80000 -DFDT_OFFSET=0x08000000
> > -DFS_OFFSET=0x10000000 -DKERNEL=Image -DFILESYSTEM=filesystem.cpio.gz -E
> > -P -C -o model.lds model.lds.S
> > aarch64-linux-gnu-ld -o xen-system.axf --script=model.xen.lds
> > aarch64-linux-gnu-ld: section .xen LMA
> > [0000000080a00000,0000000080ac814f] overlaps section .kernel LMA
> > [0000000080080000,0000000080f009ff]
> > Makefile:78: set di istruzioni per l'obiettivo "xen-system.axf" non riuscito
> > make: *** [xen-system.axf] Errore 1\
> > 
> > Clearly there is a problem with the offset of xen section but i can't
> > figure out how to solve it.
> 
> I would recommend to use the latest version of bootwrapper which is now
> including support for Xen. I haven't yet updated the wiki with the runes
> but here a quick summary of the step I am using:
> 
> * Building bootwrapper
> 
> 42sh> git clone 
> git://git.kernel.org/pub/scm/linux/kernel/git/mark/boot-wrapper-aarch64.git
> 42sh> autoreconf -i
> 42sh> ./configure --host=aarch64-linux-gnu --with-kernel-dir=<kernel-dir> 
> --with-dtb=<dtb> \
> --with-cmdline="console=hvc0 earlycon=pl011,0x1c090000 root=/dev/vda rw" 
> --enable-psci \
> --with-xen-cmdline="dtuart=serial0 console=dtuart no-bootscrub dom0_mem=512M" 
> \
> --with-xen=<xen-bin> --with-cpu-ids=0,1,2,3
> 42sh> make
> 
> Where:
>   * <kernel-dir> is the path to the kernel repository
>   * <dtb> is the path to the device-tree. I am using the one shipped with 
> Linux
>     in arch/arm64/boot/dts/arm/foundation-armv8.dtbs
>     It will be built if you did make all in Linux
>   * <xen-bin> is the path to Xen binary (xen/xen in the repo)
> 
> * Command line for the foundation model
> 42sh> Foundation_Platform --image=<image> --block-device=<rootfs> --cores=4
> 
> Where:
>   * <image> is the path to xen-system.axf produced by bootwrapper
>   * <rootfs> is the patch to your rootfs
> 
> Let me know if you need more details.

Thanks Julien, I successfully booted Xen and Linux following these
steps. I quickly updated the wiki.

Luca, I took me a while to figure out that for root=/dev/vda to work
properly, Linux requires not just all the filesystem and virtio options
enabled in the kernel config, but also CONFIG_VIRTIO_MMIO=y. With that,
you should be able to boot Xen, Linux and mount the root filesystem. If
you download one of the Ubuntu arm64 cloud images, the root device will
be /dev/vda1.

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