Re: [Xen-devel] Question about HVM network

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Sun, 2011-11-06 at 14:12 +0000, cc Luit wrote:
> Hi, all,
> 
> 
> I've a question about how network of HVM works, 
> when hvm startup, I found the qemu register the io port 0xc100-0xc1ff
> to the function rtl8139_ioport_write, is this means qemu emulate the
> rtl8139 NIC to handle network io event?

I think this is the default. You can select a different emulated NIC
using e.g. "model=e1000" in your VIF stanza in the guest configuration
file.

> but when I scp a file to the remote machine, I cannot find any write
> to these ports, so I'm curious how hvm's network works?

Perhaps you have ended up with PVHVM network driver? This will take
precedence to the emulated NIC if present.

Ian.

> 
> 
> first I'm not using the passthrough, so I think that it will use DMA:
> after it write the content to the memory, it will use PIO to write to
> one of the port to tell the qemu it need to start DMA, but there is no
> write to the port, then how does the rtc8139 emulated by qemu know
> when to start the DMA and where is the memory address?
> 
> 
> hope someone can help me~ thanks in advance.
> 
> 
> -- 
> - Luit @ Parallel Processing Institute, Fudan University 
> 



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