linux-kernel - Re: [Xen-devel] [PATCH v11 02/12] xen/pvh: Define what an PVH guest is.

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Message-ID: <1387382463.28680.52.camel@kazak.uk.xensource.com>
Date:	Wed, 18 Dec 2013 16:01:03 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	<linux-kernel@...r.kernel.org>, <david.vrabel@...rix.com>,
	<jbeulich@...e.com>, <xen-devel@...ts.xenproject.org>,
	<boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [PATCH v11 02/12] xen/pvh: Define what an PVH guest
 is.

On Wed, 2013-12-18 at 14:55 +0000, Stefano Stabellini wrote:
> On Wed, 18 Dec 2013, Stefano Stabellini wrote:
> > On Tue, 17 Dec 2013, Konrad Rzeszutek Wilk wrote:
> > > From: Mukesh Rathor <mukesh.rathor@...cle.com>
> > > 
> > > Which is a PV guest with auto page translation enabled
> > > and with vector callback. It is a cross between PVHVM and PV.
> > > 
> > > The Xen side defines PVH as (from docs/misc/pvh-readme.txt,
> > > with modifications):
> > > 
> > > "* the guest uses auto translate:
> > >  - p2m is managed by Xen
> > >  - pagetables are owned by the guest
> > >  - mmu_update hypercall not available
> > > * it uses event callback and not vlapic emulation,
> > > * IDT is native, so set_trap_table hcall is also N/A for a PVH guest.
> > > 
> > > For a full list of hcalls supported for PVH, see pvh_hypercall64_table
> > > in arch/x86/hvm/hvm.c in xen.  From the ABI prespective, it's mostly a
> > > PV guest with auto translate, although it does use hvm_op for setting
> > > callback vector."
> > > 
> > > We don't have yet a Kconfig entry setup as we do not
> > > have all the parts ready for it - so we piggyback
> > > on the PVHVM config option. This scaffolding will
> > > be removed later.
> > > 
> > > Signed-off-by: Mukesh Rathor <mukesh.rathor@...cle.com>
> > > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > 
> > Could you please add an "&& CONFIG_X86"?
> 
> On second thought, given that it is just temporary and that PVHVM is not
> defined on ARM, it could be OK. But maybe it is worth adding a small
> comment on the fact that this is an x86-only option.

I wonder if it should be CONFIG_XEN_X86_{PVH,PVHVM} instead?


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