linux-kernel - Re: Q:pt_base in COMPAT mode offset by two pages. Was:Re: [Xen-devel] [PATCH 02/11] xen/x86: Use memblock

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Message-ID: <alpine.DEB.2.02.1208221540570.15568@kaball.uk.xensource.com>
Date:	Wed, 22 Aug 2012 15:41:12 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Q:pt_base in COMPAT mode offset by two pages. Was:Re: [Xen-devel]
 [PATCH 02/11] xen/x86: Use memblock_reserve for sensitive areas.

On Wed, 22 Aug 2012, Jan Beulich wrote:
> >> The toolstack works fine - so launching 32-bit guests either
> >> under a 32-bit hypervisor or 64-bit works fine:
> >> ] domainbuilder: detail: xc_dom_alloc_segment:   page tables  : 0xcf805000 -> 
> > 0xcf885000  (pfn 0xf805 + 0x80 pages)
> >> [    0.000000] PT: cf805000 (f805000)
> >> 
> > 
> > And this patch on top of the others fixes this..
> 
> I didn't look at this in too close detail, but I started to get
> afraid that you might be making the code dependent on
> many hypervisor implementation details. And should the
> above turn out to be a bug in the hypervisor, I hope your
> kernel side changes won't make it impossible to fix that bug.

I agree
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