----- 原始邮件 -----
发件人：<penghao122@sina.com>
收件人："Kevin O'Connor" <kevin@koconnor.net>
主题：回复：Re: [SeaBIOS] about ZoneHigh occupying ram from last address of below 4G ram
日期：2015年04月15日 21点15分

----- 原始邮件 -----
发件人：Kevin O'Connor <kevin@koconnor.net>
收件人：penghao122@sina.com
抄送人：seabios <seabios@seabios.org>
主题：Re: [SeaBIOS] about ZoneHigh occupying ram from last address of below 4G ram
日期：2015年04月15日 00点45分

On Tue, Apr 14, 2015 at 11:57:08PM +0800, penghao122@sina.com wrote:
> I'm using seabios 1.7.5-0 for kvm ,and I find some problem when
> using windows 7 64bit bandvirtual machine.If I configure the windows
> 7 64bit vm memory to 8GB ,the vm can't boot up very often(some
> win7-64bit version easy to trigger) .I use trace-cmd tool to trace
> it ,the vm just scan from last ram of below 4G(0xc000_0000) to 4G
> address byte by byte.This is very time-consuming.From E820 table,the
> address range contain nothing(it is an address hole).
>
> I query clue from seabios because I can't find any problems in kvm
> or qemu. seabios keep a range of ram from last address below 4G as
> zonehigh ram .I guess the windows os see a not aligned ram address
> space and scan from 0xc000_0000. so I try to change the ZoneHigh to
> low address space (I choose 128MB,grub use from 1MB address
> space).after I changed,I can boot win7-64bit vm normally.
>
> So I want to know whether changing ZoneHigh to 128MB can be a
> general modification.
I haven't seen any other reports of issues like this with Win7. I
suspect something else is going on. Please provide the full debug log
(as described at: http://seabios.org/Debugging ) with an unmodified
seabios from both a succesful boot event and a failed boot event.
-Kevin

 

I just can' boot succesfully if I use unmodified seabios (vm using 8 GB memory).I will try again.

The attachment is the output of seabios when booting failed.