On 10/11/2011 03:29 PM, Anthony Liguori wrote:
On 10/11/2011 08:23 AM, Avi Kivity wrote:
On 10/11/2011 03:19 PM, Anthony Liguori wrote:
No, DMA has a lot bigger granularities in kvm/user interaction. We
can easily DMA a 50MB region with a single kvm/user exit. For PIO we
can at most do page granularity.
So make a proper PCI device for kernel loading. It's a much more
natural approach and let's use alias -kernel/-initrd/-append to
-device kernel-pci,kernel=PATH,initrd=PATH
This is overkill. First let's optimize rep/movs before introducing any
more interfaces. If that doesn't work, then we can have a dma interface
for fwcfg. But a new pci device?
This is how it would work on bare metal. Why is a PCI device overkill
compared to a dma interface for fwcfg?
Because it's a limited use case, despite all the talk around it.
If we're adding dma to fwcfg, then fwcfg has become far too complex
for it's intended purpose.
I have to agree to that.
btw, -net nic,model=virtio -net user is an internal DMA interface we
already have. We can boot from it. Why not use it?