[Xen-devel] Ring3 Hypercalls from HVM DomU

[Srujan Kotikela <ksrujandas@xxxxxxxxx>]

Hi,

I have created hypercalls that can be invoked from ring-3 by setting the ring-3 gate in xen. This works fine when I invoke the hypercall from Dom0. I want to invoke the same from a HVM DomU. But I keep getting the segmentation fault when I invoke the ring3_hyperacall from HVM DomU. Any ideas?

The setting up gate is as follows:
_set_gate(idt_table+0x92, 14, 3, &hypercall);

The hypercall invoking code looks like this:
int ring3_hypercall(unsigned long va, int command)
{
    int ret;

    asm("int $0x92" : "=a"(ret) : "a"(40), "b"(va), "c"(command));
   
    return ret;
}

~ SDK

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel