Of course. Agh, I forgot to change it to 1. If someone else looks at this, in my case it means this file: xen/arch/x86/x86_64/entry.S
Thanks! On Nov 9, 2014, at 2:27 PM, Andrew Cooper <andrew.coop...@citrix.com<mailto:andrew.coop...@citrix.com>> wrote: On 09/11/14 19:16, Amaro, Emmanuel wrote: Hello, I am trying to pass a pointer to an hyper call in the simplest possible way, set it’s value, an return it to the guest. I have tried 2 different ways: - Directly with simple pointers (I read somewhere this would work on x86), but the pointer address is set to 0x0000deadbeef, so dereferencing it causes a panic. - With XEN_GUEST_HANDLE: long do_dummy(XEN_GUEST_HANDLE(uint64_t) ptr) { It looks like you have introduced a new hypercall called dummy. I presume from this code that you have filled in a new handler in the hypercall_table, but have you set the expected number of args in the hypercall_args_table? The default number of args is 0, which cases a debug Xen to deliberately clobber all the registers to 0xdeadbeef ~Andrew
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