Re: [Xen-devel] xen-kernel and EDD

To:	Lin-Bao Zhang <2004.zhang@xxxxxxxxx>
Subject:	Re: [Xen-devel] xen-kernel and EDD
From:	Keir Fraser <keir@xxxxxxx>
Date:	Thu, 18 Aug 2011 12:04:24 +0100
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On 18/08/2011 11:43, "Lin-Bao Zhang" <2004.zhang@xxxxxxxxx> wrote:

> -- 
> so in my system , my EBDA area should be 95400 ~ a0000  ,about 43KBytes.
> from xen.gz (hypervisor) code , trampoline.S , we know
> ----
> #define BOOT_TRAMPOLINE 0x90000
> #define bootsym_phys(sym)                                 \
>     (((unsigned long)&(sym)-(unsigned long)&trampoline_start)+BOOT_TRAMPOLINE)
> -----
> 0x95400 - 0x90000 = 0x5400 = 21KBytes.
> 
> 21Kbytes is enough for gen.gz running(hypervisor) ?
> if hypervisor will run more area , maybe it will overlap EBDA area .
> 
> so who can tell me xen.gz 's end address ? or max long ?

It's almost certainly this. In latest Xen we run the trampoline code at
0x7c000. So you can try rebuilding your hypervisor with the following
changes:
1. Change BOOT_TRAMPOLINE to 0x7c000
2. In arch/x86/boot/head.S, change the line 'mov $0x98000,%esp' to 'mov
$0x80000,%esp'.

That will probably fix your problem.

 -- Keir

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Re: [Xen-devel] xen-kernel and EDD