linux-kernel - Re: [Xen-devel] [PATCH 0/6] 32-bit PVH domU support

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Message-ID: <559D1C8E.3040704@citrix.com>
Date:	Wed, 8 Jul 2015 13:50:22 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<david.vrabel@...rix.com>, <konrad.wilk@...cle.com>
CC:	<elena.ufimtseva@...cle.com>, <wei.liu2@...rix.com>,
	<ian.campbell@...rix.com>, <stefano.stabellini@...citrix.com>,
	<andrew.cooper3@...rix.com>, <tim@....org>,
	<linux-kernel@...r.kernel.org>, <jbeulich@...e.com>,
	<xen-devel@...ts.xenproject.org>, <ian.jackson@...citrix.com>,
	<roger.pau@...rix.com>
Subject: Re: [Xen-devel] [PATCH 0/6] 32-bit PVH domU support

On 07/07/15 04:34, Boris Ostrovsky wrote:
> 
> A set of PVH-related patches.
> 
> The first patch is x86-64 ABI fix for PVH guests. The second is a small update
> that removes redundant memset (both on PV and PVH code paths)
> 
> The rest is to enable non-privileged 32-bit PVH guests. This requires hypervisor
> patches from
> http://lists.xenproject.org/archives/html/xen-devel/2015-06/msg04817.html

The more I look at the PVH entry point into Linux, and the less I like
it -- it's much too PV-like instead of HVM-like.

However, this 32-bit support doesn't make it much worse and until
there's a decision on the longterm future of PVH I'm inclined to accept
it (provided the hypervisor side is accepted) to make it easier to
continue working on PVH support.

David
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