Re: [Xen-devel] setup_vga_pt seems can not correctly use vgabios.

["Zytaruk, Kelly" <Kelly.Zytaruk@xxxxxxx>]

On Monday, October 28, 2013 3:24 PM Huiming wrote;

>hi,

> 

>In xen-4.3.0/tools/qemu-xen-traditional/hw/pt-graphics.c,  setup_vga_pt calls get_vgabios

>to get vgabios of passed->through VGA adapter, but get_vgabios only read bios from /dev/mem,

>/dev/mem is domain 0’s memory device. /dev/mem >should only contain the vgabios of primary

>VGA adapter of domain 0.

> 

>So if I want to pass through secondary adapter of domain 0 to domain U. setup_vga_pt cannot

>correctly setup VGABIOS for >domain U. Is this correct? Any comments are appreciated.

> 

>thanks

>huiming

 

This is only a problem if you are trying to pass the Dom0 secondary adapter through as a

primary adapter to the DomU.  In this case the DomU will have the wrong VBios.

 

There is no problem if you are passing the Dom0 secondary adapter through as a secondary

adapter to DomU.  In this case the emulated (Cirrus) VBios will be properly copied to 0xc0000.

 

Thanks,

Kelly

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