On Oct 1, 2006, at 3:33 PM, Jimi Xenidis wrote:


On Oct 1, 2006, at 1:20 PM, poff wrote:

I don't know if I'm off base but have you added appropriate code to
linux? specifically arch/powerpc/platforms/xen/hcall.c ?

An existing hypercall, viz #36, do_domctl, provides several commands to access guest domains. For example, XEN_DOMCTL_getmemlist and XEN_DOMCTL_max_mem. Thought I would add another to copy the htab, XEN_DOMCTL_gethtab. So I think no modification is needed to hcall.c

Sadly, there is:
Some architectures require that the linux kernel has knowledge of all hcalls, and PPc is one of them

you will notice in:
  arch/powerpc/platforms/xen/hcall.c: xenppc_privcmd_domctl()
there is a huge switch statement for all the domctl OPs.

If your case is not in the switch then you are subject to:
        default:
printk(KERN_ERR "%s: unknown domctl cmd %d\n", __func__, kern_op.cmd);
                return -ENOSYS;
        }
and hence your ENOSYS

BTW: This message may not reach your dom0 console, you can either see it by running the dmesg command --or-- add "debug" to your dom0 kernel options. Adding "sysrq=1" may be may also be a good thing since init scripts usually disable sysrq.

-JX




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