Re: [Xen-devel] [PATCH 1/2] pvh: clearly specify used parameters in vcpu_guest_context

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 20/11/13 10:29, Roger Pau Monnà wrote:
> On 20/11/13 10:54, Jan Beulich wrote:
> > > > > On 20.11.13 at 10:37, Roger Pau MonnÃ<roger.pau@xxxxxxxxxx> wrote:
> > > On 20/11/13 10:28, Jan Beulich wrote:
> > > > > > > On 20.11.13 at 10:18, Roger Pau MonnÃ<roger.pau@xxxxxxxxxx> wrote:
> > > > > On 19/11/13 17:53, Jan Beulich wrote:
> > > > > > > > > On 19.11.13 at 17:42, Roger Pau MonnÃ<roger.pau@xxxxxxxxxx> wrote:
> > > > > > > Trying to make all those fields functional on PVH (or HVM) is quite
> > > > > > > useless IMHO, it's going to add more code that I doubt anyone is going
> > > > > > > to use when you can instead use the bare metal functions to set all
> > > > > > > those things (and from an OS point of view it's also more comfortable
> > > > > > > because you need less Xen specific stuff).
> > > > > > That last part I certainly agree to, but that would apply to CR0
> > > > > > and CR4 just as much.
> > > > > I've removed the usage of anything that's not strictly necessary in
> > > > > order to do AP bringup, so I've removed the setting of debugregs:
> > > > You can't - this code is also used for HVM guests.
> > > Yes, my fault, I erroneously thought this was introduced by 35b1e076,
> > > but it has been there longer than that. Would you agree to a patch
> > > similar to the one posted, but without touching the setting of debugregs?
> > Yes, if Mukesh and George confirm that this is not going to break
> > things.
> Here it is:
>
> ---
>  From dc19632f361b2737791821232ce9b38508f1cd7f Mon Sep 17 00:00:00 2001
> From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
> Date: Thu, 14 Nov 2013 18:07:51 +0100
> Subject: [PATCH v3] pvh: clearly specify used parameters in
>   vcpu_guest_context
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> The aim of this patch is to define a stable way in which PVH is
> going to do AP bringup.
>
> Since we are running inside of a HVM container, PVH should only need
> to set flags, cr3 and user_regs in order to bring up a vCPU, the rest
> can be set once the vCPU is started using the bare metal methods.
>
> Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Acked-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

Release-wise, this only affects PVH codepaths, so should be fine.

 -George


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