* Neil Horman (nhorman at redhat.com) wrote: > On Thu, Apr 01, 2010 at 06:23:53PM -0700, Chris Wright wrote: > > Hit another kdump problem as reported by Neil Horman. When initializaing > > the IOMMU, we attach devices to their domains before the IOMMU is > > fully (re)initialized. Attaching a device will issue some important > > invalidations. In the context of the newly kexec'd kdump kernel, the > > IOMMU may have stale cached data from the original kernel. Because we > > do the attach too early, the invalidation commands are placed in the new > > command buffer before the IOMMU is updated w/ that buffer. This leaves > > the stale entries in the kdump context and can renders device unusable. > > Simply enable the IOMMU before we do the attach. > > > > Cc: Neil Horman <nhorman at tuxdriver.com> > > Cc: Vivek Goyal <vgoyal at redhat.com> > > Signed-off-by: Chris Wright <chrisw at sous-sol.org> > > I'll test this out this weekend, thanks Chris! Great, thanks! I tested w/ both default and iommu=pt. Both worked, didn't spot any regressions. But additional testing is very welcome. thanks, -chris
