As far as I am aware, the arm support for Vchans was never finished. I tried to get it running once and I believe the issue was that it expected the same vmm_manager device that the x86 vmm provides, but this isn't implemented on the ARM vmm.

From: Devel <devel-bounces@sel4.systems> on behalf of Daniel Wang <danielwang.ksu@gmail.com>
Sent: Wednesday, March 14, 2018 2:57 PM
To: Kuz, Ihor (Data61, Kensington NSW)
Cc: devel@sel4.systems
Subject: Re: [seL4] Questions about Vchan

Thank you, Ihor, That’s good to know. However, for now does the Vchan for ARM still functional? With help from Chris I was able to compile Vchan for both TK1 and EXYNOS5410. But I could not find /dev/vmm_manager virtual driver after boot. Does it need to have a Linux kernel module to mount and manage ioctl() syscall?

Best Regards

-Daniel Wang

On Mar 13, 2018, at 8:44 PM, <Ihor.Kuz@data61.csiro.au> <Ihor.Kuz@data61.csiro.au> wrote:

We haven’t touched the vchan code in a while, and have pretty much stopped using vchan. We developed cross-vm dataports and events for x86[1], and will be starting work to complete those with cross-vm RPC and make that available on ARM too.

Of course that doesn’t help you right now, but just letting you know.

Ihor.

[1] https://wiki.sel4.systems/CAmkESVM#Cross_VM_Connectors

On 14 Mar 2018, at 12:43 am, Chris Guikema <Chris.Guikema@dornerworks.com> wrote:

Hey Daniel,

I had tried to setup the VM, and opened an issue on the camkes-arm-vm repo -https://github.com/SEL4PROJ/camkes-arm-vm/issues/3

The VChan is quite outdated. My issue should summarize what I had to do in order to get the system to compile.

Chris

From: Devel [mailto:devel-bounces@sel4.systems] On Behalf Of Daniel Wang
Sent: Tuesday, March 13, 2018 3:49 AM
To: devel@sel4.systems
Subject: [seL4] Questions about Vchan

Hi all,

I’m trying to figure out how to use the Vchan library to setup communication between guest OS and native components. I got couple questions how you can give me some advices.

1. I saw the camkes_vchan_con_t structure in the helloworld components (camkes-arm-vm), but I could not find the implementation for vchan_con_new_connection(), vchan_con_rem_connection(), etc. Are those autogenerated by camkes? If so how it is generated?

static camkes_vchan_con_t con = {
   .connect = &vchan_con_new_connection,
   .disconnect = &vchan_con_rem_connection,
   .get_buf = &vchan_con_get_buf,
       .status = &vchan_con_status,

   .alert = &vchan_con_ping,
   .wait = &vevent_wait,
   .poll = &vevent_poll,

   .dest_dom_number = 0,
   .source_dom_number = 50,
};

2. I tried to compile the Vchan support and demo helloworld components for odroid-xu. But the compile shows error due to the VM.h file (camkes-arm-vm/projects/vm/components/VM/src/cmks_vchan_vm.c:23) cannot be found. How can I generate the VM.h file?

Thanks a lot!

Best Regards
-Daniel Wang

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