linux-kernel - Re: [Xen-devel] Re: [PATCH 7/7] xen: Make event channel work with PV extension of HVM

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Date:	Thu, 4 Mar 2010 19:22:08 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Sheng Yang <sheng@...ux.intel.com>,
	xen-devel <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ian Campbell <Ian.Campbell@...citrix.com>,
	Ian Pratt <Ian.Pratt@...citrix.com>,
	Keir Fraser <Keir.Fraser@...citrix.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [Xen-devel] Re: [PATCH 7/7] xen: Make event channel work with
 PV extension of HVM

On Thu, 4 Mar 2010, Jeremy Fitzhardinge wrote:
> 
> I think you need to expand this comment to explain the consequences of
> this change on SMP bringup and timers.  I still don't see why there are
> (or should be) any differences from PV cpu bringup, aside from the tiny
> details of syscall setup (and MTRR I guess, but that's all a noop
> anyway, right?).
> 
> Also, I think you can probably do the timer changes in a separate patch,
> as even with evtchns, an emulated timer device interrupt will still be
> delivered properly via VIRQ_EMUL_PIN_*.
> 
 
One of the problems is that some VCPU initialization hypercalls at the
moment are PV specific and don't work with HVM guests, in particular I
find that VCPUOP_initialise doesn't work correctly for me.

But the timers shouldn't be an issue because you should be able to
receive the VIRQ_TIMER or the emulated timer interrupt anyway.


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