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Re: [Xen-devel] [PATCH] xen/x86: Zero out .bss for PV guests

To: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, <konrad.wilk@xxxxxxxxxx>, <david.vrabel@xxxxxxxxxx>
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Wed, 24 Feb 2016 14:12:42 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, mcgrof@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
Delivery-date: Wed, 24 Feb 2016 14:13:26 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 22/02/16 22:06, Boris Ostrovsky wrote:
> Baremetal kernels clear .bss early in the boot. Since Xen PV guests don't
> excecute that early code they should do it too.
> 
> (Since we introduce macros for specifying 32- and 64-bit registers we
> can get rid of ifdefs in startup_xen())

.bss must have been cleared for PV guests otherwise they would be
horribly broken.  What was the method and why is it no longer sufficient?

David

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- [Xen-devel] [PATCH] xen/x86: Zero out .bss for PV guests
  - From: Boris Ostrovsky

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