[Xen-devel] Checking hypercall page existence!

["Jayaraman, Bhaskar" <Bhaskar.Jayaraman@xxxxxxx>]

Hi, I've mapped hypercall pages onto a VxWorks HVM using the CPUID and WRMSR 
instructions on a 32 bit pentium machine. However, when I'm trying to make a 
hypercall on it the hypercall on it I'm unable to succeed and it fails. I tried 
the HYPERVISOR_xen_version and HYPERVISOR_vm_assist hypercalls and they both 
are returning < 0 values.
I was wondering whether there is any way in which I can verify whether the 
hypercall pages have actually been mapped. I could take a dump of the pages 
that wrmsr maps into my domain and look through it for hypercall opcodes but if 
there is an easier way to confirm that, like a signature in the page mapped, 
please let me know.
Thanks.
Bhaskar.

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