On Fri, 15 May 2020 11:22:51 -0400 Peter Xu <peterx@xxxxxxxxxx> wrote: > On Thu, May 14, 2020 at 04:55:17PM -0600, Alex Williamson wrote: > > > I'm not if this makes sense, can't we arrange to directly trap the > > > IOMMU failure and route it into qemu if that is what is desired? > > > > Can't guarantee it, some systems wire that directly into their > > management processor so that they can "protect their users" regardless > > of whether they want or need it. Yay firmware first error handling, > > *sigh*. Thanks, > > Sorry to be slightly out of topic - Alex, does this mean the general approach > of fault reporting from vfio to the userspace is not gonna work too? AFAIK these platforms only generate a fatal fault on certain classes of access which imply a potential for data loss, for example a DMA write to an invalid PTE entry. The actual IOMMU page faulting mechanism should not be affected by this, or at least one would hope. Thanks, Alex
