Re: [PATCH v3 1/3] virtio_net: Stop doing DMA from the stack

2015-10-28 Thread Michael S. Tsirkin
On Tue, Oct 27, 2015 at 11:38:58PM -0700, Andy Lutomirski wrote: > From: Andy Lutomirski > > Once virtio starts using the DMA API, we won't be able to safely DMA > from the stack. virtio-net does a couple of config DMA requests > from small stack buffers -- switch to using dynamically-allocated

[PATCH v3 1/3] virtio_net: Stop doing DMA from the stack

2015-10-27 Thread Andy Lutomirski
From: Andy Lutomirski Once virtio starts using the DMA API, we won't be able to safely DMA from the stack. virtio-net does a couple of config DMA requests from small stack buffers -- switch to using dynamically-allocated memory. This should have no effect on any performance-critical code paths.