Hi Stefano, 2017-03-21 21:36 GMT+01:00 Stefano Stabellini <sstabell...@kernel.org>:
> On Tue, 21 Mar 2017, Luca Miccio wrote: > > Hi, > > I'm an undergraduate student from the Computer Science Bachelor's Degree > > of the University of Modena and Reggio Emilia (Italy). > > > > I'm very interested in the "Xen on ARM: create multiple guests from > device tree" > > project. > > A year ago I started a project on the "Hikey" board with the Android > operating > > system in order to integrate BFQ - which is a proportional-share > storage-I/O > > scheduler - in it improving the device performances. Now the project is > still in > > development and it is supervised by my professor which, also, told me > about GSoC. > > Since I studied the C language for a full year at university and I > already had to deal > > with kernel-stuffs, cross-compiling and so on, I chose this project. > > > > Since I'm not very familiar with the "device tree" notion, I'm wondering > if you could give me > > some suggestions on where I could start from. > > > > The first thing I will do is to install xen and start to familiarize > with it. > > Any advice regarding this project will be really appreciated. > > Hello Luca, > > Thanks for your interest in Xen on ARM! Like you wrote, I would start by > compiling Xen from source and installing it on your board. The HiKey is > a decent option, but it can be difficult to work with if you don't have > serial access. I know that uart connectors for the HiKey are sold > separetely: > > http://www.96boards.org/product/uarts/ > Otherwise, you could use the ARMv8 Foundation Platform, which is a > free (as in beer) software emulator: > > https://developer.arm.com/products/system-design/fixed-virtual-platforms > https://community.arm.com/processors/b/blog/posts/ > virtualization-on-arm-with-xen > > I chose this option for now Unfortunately all our guides on installing Xen on the Foundation Model > are outdated, but I know that Andre (CC'ed) is using it for development. > He should be able to help you if you run into any issues. > I tried to install and setting up xen with the blog post that you have mentioned above and i have some issues when compiling the boot wrapper with the git repository provided in the post. In particular i get this error when executing this command: $ make CROSS_COMPILE=aarch64-linux-gnu- FDT_SRC=foundation-v8.dts IMAGE=xen-system.axf This is the error i get: 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 booted correctly a different kernel image with another .axf file only to test the Foundation Model and it worked with no problems. It maybe be helpful my toolchain version: aarch64-linux-gnu-gcc (Debian 6.3.0-9) 6.3.0 20170316 I am using all the file provided by the post at the link ( in particular the Foundation-v8.dts file): https://community.arm.com/cfs-file/__key/telligent-evolution-components-attachments/01-2142-00-00-00-00-89-21/2972.zip If you need any type of information, please ask. However I have correctly compiled xen from source on my laptop and i am trying to become familiar with the hypervisor itself. > > After you complete the setup of the building and testing environments, > the next thing to do is getting familiar with the code. The best way to > do that is by fixing any of the bugs or implementing any of the features > on the Xen Project Tracker: > > https://xenproject.atlassian.net/projects/XEN/issues > > Most of the items listed are large projects, but some of them are pretty > small, small enough to be a starting point. For example XEN-29 (Add > -fstack-protector support to the hypervisor), or XEN-10 (Clean target > makefile should remove all temporary for every architecture). > > 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. Cheers, > > Stefano Best regards, Luca
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