Re: virtio hard disk on qemu

[Jason Thorpe <thorpej%me.com@localhost>]

> On Jan 24, 2023, at 9:20 PM, Tyler Mitchell <fission%ldx.ca@localhost> wrote:
> 
> Hi,
> 
> Has anyone tried using virtio hard disks on NetBSD/sparc64 on QEMU?
> 
> I gave it a go today, but the kernel didn't finish booting. From
> what I can gather, it hung while trying to read the disklabel (on a
> blank, unformatted disk, in my case).

Last I checked, there is a bug (or maybe it’s intentional, I dunno) in Qemu where the Virtio code assumes that DMA addresses == CPU addresses for RAM.  This would impact sparc64 and alpha (which is where I noticed it).  I haven’t looked for a while now, but I guess this hasn’t been fixed yet (it also might be the case that the Qemu maintainers don’t consider it a bug.)

-- thorpej