On Wed, Oct 17, 2012 at 6:14 AM, Will Deacon <[email protected]> wrote: > When using a virtio transport, the 9p net device allocates pages to back > the descriptors inserted into the virtqueue. These allocations may be > performed from atomic context (under the channel lock) and can therefore > return high mappings which aren't suitable for virt_to_phys. > > This patch ensures that virtual addresses for virtio queue descriptors > are converted to physical addresses using kmap_to_page, which handles > high memory correctly. > > Cc: Rusty Russell <[email protected]> > Cc: Sasha Levin <[email protected]> > Signed-off-by: Marc Zyngier <[email protected]> > Signed-off-by: Will Deacon <[email protected]> > ---
One of the things I was seeing when fuzzing within lkvm were random crashes resulting from "odd" addresses used by virtio-9p queue descriptions. I attributed that to memory corruption as a result of something else failing the fuzz tests before, but this patch explains what might have gone wrong. I'll plug it in and run tests on it. Thanks, Sasha -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
