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Re: [Qemu-devel] PC machine types switched to SeaBIOS/gPXE

From: Kevin O'Connor
Subject: Re: [Qemu-devel] PC machine types switched to SeaBIOS/gPXE
Date: Mon, 2 Nov 2009 08:51:07 -0500
User-agent: Mutt/1.5.19 (2009-01-05)

On Mon, Nov 02, 2009 at 03:32:54PM +0200, Avi Kivity wrote:
> On 11/02/2009 03:15 PM, Alexander Graf wrote:
>> They are taken with -d in_asm,cpu,int after doing:
>> $ ./x86_64-softmmu/qemu-system-x86_64 -kernel ../kvm/arch/x86/boot/bzImage
>> with a fresh checkout from your kvm kernel tree (make defconfig) and a
>> fresh git checkout of qemu (./configure --target-list=x86_64-softmmu)
>> They basically mean that with SeaBIOS the Linux loading code is trying
>> to jump off to zeros while at the same place there is useful data using
>> pcbios.bin.
> Is seabios clobbering memory?  Gleb/Kevin?

I have not tested with the -kernel option before.  I believe you may
be running into the clearing of memory that PMM does - see
malloc_finalize() in src/pmm.c.  The PMM spec requires that low memory
be cleared before starting the boot process.

I'll take a closer look tonight.


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