Re: [Xen-devel] [PATCH for-4.5 v6 00/16] Xen VMware tools support

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 09/22/2014 02:56 PM, Ian Campbell wrote:
> On Sat, 2014-09-20 at 14:07 -0400, Don Slutz wrote:
>
> > I picked this subset to start with because it only has changes in
> > Xen.
> >
> > Some of this code is already in QEMU
> As I suggest in my reply to one for the rpc port patches it's not clear
> that any of this needs to be in Xen rather than qemu in the first place.
>
> I came to think this even more once I saw the save/restore support...
I don't think qemu can get notified on either cpuid or #GP faults, can it?

A big chunk of the functionality here is to allow a userspace process to 
transparently make the "hypercalls" without the OS needing to explicitly 
give it access to the IO space, by trapping the resulting #GP faults and 
checking to see if they are IO instructions .  If that's functionality 
we think is important, then it will have to be done in Xen, I think.
 -George

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