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[Xen-devel] Re: xen_hvm_callback_vector

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: [Xen-devel] Re: xen_hvm_callback_vector
From: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>
Date: Sat, 28 Aug 2010 19:19:17 +0100
Cc: "Xen-devel@xxxxxxxxxxxxxxxxxxx" <Xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
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On Fri, 2010-08-27 at 23:57 +0100, Jeremy Fitzhardinge wrote:
> Should entry_64.S's xen_hvm_callback_vector be calling
> xen_evtchn_do_upcall or xen_hvm_evtchn_do_upcall?
> If not the hvm version, when does that get used?

xen_evtchn_do_upcall is used for the callback vector interrupt injection
(and regular PV obviously).

xen_hvm_evtchn_do_upcall is used by the old-style PCI IRQ injection
route in platform-pci.c if the callback vector is not available.

So entry_64.S should be using xen_evtchn_do_upcall.

Also, I think smp_xen_hvm_callback_vector is simply a redundant
duplicate of xen_evtchn_do_upcall which could be removed.


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