Messages in this thread | | | Date | Sun, 25 Apr 2010 02:55:29 -0700 (PDT) | Subject | Re: [RFC][PATCH v4 00/18] Provide a zero-copy method on KVM virtio-net. | From | David Miller <> |
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From: xiaohui.xin@intel.com Date: Sun, 25 Apr 2010 17:20:06 +0800
> The idea is simple, just to pin the guest VM user space and then let > host NIC driver has the chance to directly DMA to it.
Isn't it much easier to map the RX ring of the network device into the guest's address space, have DMA map calls translate guest addresses to physical/DMA addresses as well as do all of this crazy page pinning stuff, and provide the translations and protections via the IOMMU?
What's being proposed here looks a bit over-engineered.
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