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[Xen-devel] size of hypercall parameter

  • To: xen-devel@xxxxxxxxxxxxx
  • From: Anh Dinh <ug93tad@xxxxxxxxx>
  • Date: Fri, 10 Oct 2014 08:52:45 +0800
  • Delivery-date: Fri, 10 Oct 2014 00:52:56 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

I wrote a hypercall that takes in a pointer to memory region:

void do_test(char *p){
... // do something with the memory in the hypervisor space

and invoke it in both Dom0 and DomU through privcmd.Â

But when I pass a memory region of tens of KB (not very large), the system crashes and reboots.Â

Is there a limit to the memory region passed into the hypercall?

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