Messages in this thread | | | Subject | Re: [Xen-devel] [PATCH] xen/x86: Zero out .bss for PV guests | From | Andrew Cooper <> | Date | Wed, 24 Feb 2016 14:15:43 +0000 |
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On 24/02/16 14:12, David Vrabel wrote: > 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?
The domain builder hands out zeroed pages. I don't believe we guarantee that the guests RAM is clean, but it is in practice.
~Andrew
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