Re: [Xen-devel] difference between xen hypervisor and common kernel on handling BIOS's e820 map ?

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Aug 29, 2011 at 10:24:59PM -0700, Lin-bao Zhang wrote:
> in a same , I have xen-kernel and common kernel installed ,
> in grub.conf , just like this:
> 
> title Red Hat Enterprise Linux Server (2.6.18-268.el5xen)
> root (hd0,0)
> kernel /boot/xen.gz-2.6.18-268.el5  loglvl=all guest_loglvl=all sync_console 
> console_to_ring com1=115200,8n1 console=com1
> module /boot/vmlinuz-2.6.18-268.el5xen ro root=LABEL=/1 console=hvc0 
> earlyprintk=xen nomodeset

You don't need nomodeset on '2.6.18' kernels.

> module /boot/initrd-2.6.18-268.el5xen.img
> 
> title Red Hat Enterprise Linux Server (2.6.18-268.el5)
>         root (hd0,0)
>         kernel /boot/vmlinuz-2.6.18-268.el5 ro root=LABEL=/1 console=tty0 
> console=ttyS0,115200
>         initrd /boot/initrd-2.6.18-268.el5.img
> 
> --------------
> but I found difference about e820map from the two kernels :
> 
> common kernel: --------------------------------
> BIOS-provided physical RAM map:
>  BIOS-e820: 0000000000010000 - 0000000000090400 (usable)
>  BIOS-e820: 0000000000090400 - 0000000000a0000 (reserved)
>  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
>  BIOS-e820: 0000000000100000 - 000000007f5f0000 (usable)
>  BIOS-e820: 000000007f5f0000 - 000000007f62c000 (ACPI data)
>  BIOS-e820: 000000007f62c000 - 000000007f62d000 (usable)
>  BIOS-e82: 000000007f62d000 - 00000000779d000 (reserved)
>  BIOS-e820: 0000000779d000 - 000000007f7a0000 (ACPI data)
>  BIOS-e0: 00000007f7a0000 - 0000000090000000 (reserved)
>  BIOS-e820: 00000000fec00000 - 00000000fee10000 (reserved)
>  BIOS-e820: 00000000ff800000 - 0000000100000000 (eservd)
>  BIOS-e820: 0000000100000000 -0000000480000000 (usable)
>  BIOS-e820: 0000002000000000 - 0000002400000000 (usable)
>  BIOS-e820: 0000004000000000 - 0000004400000000 (usable)
>  BIOS-e820: 0000006000000000 - 00000600000000 (usable)
> 
> xen-kernel:
>  Xen-e820 RAM map:
> (XEN)  0000000000000000 - 0000000000090400 (usable)
> (XEN)  0000000000090400 - 00000000000a0000 (reserved)
> (XEN)  00000000000f0000 - 0000000000100000 (reserved)
> (XEN)  0000000000100000 - 000000007f5f0000 (usable)
> (XEN)  000000007f5f0000 - 000000007f62c000 (ACPI data)
> (XEN)  000000007f62c000 - 000000007f62d000 (usable)
> (XEN)  000000007f62d000 - 000000007f79d000 (reserved)
> (XEN)  000000007f79d000 - 000000007f7a0000 (ACPI data)
> (XEN)  000000007f7a0000 - 0000000090000000 (reserved)
> (XEN)  00000000fec00000 - 00000000fee10000 (reserved)
> (XEN)  00000000ff800000 - 0000000100000000 (reserved)
> (XEN)  0000000100000000 - 0000000480000000 (usable)
> (XEN)  0000002000000000 - 0000002400000000 (usable)
> (XEN)  0000004000000000 - 0000004400000000 (usable)
> (XEN)  0000006000000000 - 0000006400000000 (usable)      
> (XEN) System RAM: 65525MB (67098116kB)
> 
> I diff them in a picture :

Huh? Can you just do a diff of the two texts or just
do <=== on the email to point to it?

> 
> 
> as my existing knowledge , e820 map information is provided by BIOS ,it 
> should be same for all OS(windows and linux) , OS just use it . 
> but why xen-kernel's e820 map is different from that of common-kernel.
> 
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