DMA window vs actual allocatable DMA memory

Hi All, I am having trouble understanding DMA window and actual amount of addressable DMA memory. I hope someone explains me. Let me put my understanding and doubts here: Let's say I am writing code for an ethernet device driver in the virtualisation(hypervisor) environment. Now, if the

Re: DMA window vs actual allocatable DMA memory

On Wed, Jun 11, 2014 at 12:23 PM, Bob Biloxi iambobbil...@gmail.com wrote: Hi All, I am having trouble understanding DMA window and actual amount of addressable DMA memory. I hope someone explains me. Let me put my understanding and doubts here: Let's say I am writing code for an ethernet

Re: DMA window vs actual allocatable DMA memory

Thanks so much Bjorn for the reply. This is very helpful. Now my understanding is more clear. I was curious whether there is any limit from the operating system(hypervisor) as to how much DMA memory can drivers map. I'll try to investigate. On Thu, Jun 12, 2014 at 5:42 AM, Bjorn Helgaas