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

From: David Vrabel
Date: Wed Feb 24 2016 - 09:13:17 EST

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?