Re: Questions about virtio DMA operations

2021-08-29 Thread Arnabjyoti Kalita
> That's normal, yes, but you can't guarantee it. The guest can > choose to program it to any physical memory it likes. Is it ? If this is indeterministic, my approach will obviously not work. Is the bounce buffer address determined at initial startup of the guest and does it always stay the same

qemu-system-arm sharing host disk using virtiofsd

2021-08-29 Thread Dave Turvene - Work
Greetings - I'm not sure this is the best group to ask the following question but I'll start here. I use qemu to develop openwrt code.  I currently use a 9p mount to share my code/cross-compile directory to the arm guest in order to run/test the code.  openwrt uses the musl library so this works

Re: Questions about virtio DMA operations

2021-08-29 Thread Peter Maydell
On Sun, 29 Aug 2021 at 04:48, Arnabjyoti Kalita wrote: > > Thank you for the detailed explanation, Peter. It makes a lot of things clear > now. > > I see that the virtio block device is accessing guest physical memory that is > not backed by a device. That's normal, yes, but you can't guarantee