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

[Julien Grall <julien.grall@xxxxxxx>]

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.

[...]

> I took a look at the list and i have already fixed the XEN-10 task. If
> it's not a problem  i 
> would submit the patch for this small fix, while i am figuring out how
> to solve my compilation
> issue described above.

I am fine if you send the patch now. XEN-10 is a build system modifications
that will not impact the Xen binary.

Cheers,

-- 
Julien Grall

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