* What is do_ni_hypercall() for
@ 2013-02-19 23:09 Xinxin Jin
2013-02-20 1:17 ` Andrew Cooper
0 siblings, 1 reply; 2+ messages in thread
From: Xinxin Jin @ 2013-02-19 23:09 UTC (permalink / raw)
To: Xen-devel
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Hi everyone,
I traced pv hypercalls and found that the vector "do_ni_hypercall" is
invoked a lot. But this hypercall function does nothing (from the source
code). So I am very confused what is do_ni_hypercall for? Why do guests
invoke it ?
Thanks a lot,
--
Xinxin
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* Re: What is do_ni_hypercall() for
2013-02-19 23:09 What is do_ni_hypercall() for Xinxin Jin
@ 2013-02-20 1:17 ` Andrew Cooper
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Cooper @ 2013-02-20 1:17 UTC (permalink / raw)
To: Xinxin Jin; +Cc: Xen-devel@lists.xen.org
On 19/02/2013 23:09, Xinxin Jin wrote:
> Hi everyone,
> I traced pv hypercalls and found that the vector "do_ni_hypercall" is
> invoked a lot. But this hypercall function does nothing (from the
> source code). So I am very confused what is do_ni_hypercall for? Why
> do guests invoke it ?
> Thanks a lot,
> --
> Xinxin
As expected. It is the "Not Implemented" hypercall. This means that
your PV guest is erroneously asking for hypercalls which are in the
permitted range (0-63) but not implemented by the hypervisor.
See xen/arch/x86/x86_64/entry.S:hypercall_table
~Andrew
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