Tested-by: mspe...@users.sourceforge.net Problem described in bug 76331 is fully solved by Alex's patch. Could it be included in next 3.15 release ?
Thanks ! Matthieu On Thu, May 29, 2014 at 10:23 PM, Alex Williamson < alex.william...@redhat.com> wrote: > As analyzed in https://bugzilla.kernel.org/show_bug.cgi?id=76331 > we can have multiple DRHDs in a system and each may support different > guest address widths. We can add a device behind a less capable DRHD > to a domain so long as the lesser DRHD can map the existing domain > page table. We should never increase the address width as a result > of adding a device to the domain. The current code simply updates > the width to the last added device. Change to keep it at the > minumum DRHD width. > > Reported-by: mspe...@users.sourceforge.net > Signed-off-by: Alex Williamson <alex.william...@redhat.com> > Cc: David Woodhouse <dw...@infradead.org> > --- > drivers/iommu/intel-iommu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c > index e68f44b..cd41d8d 100644 > --- a/drivers/iommu/intel-iommu.c > +++ b/drivers/iommu/intel-iommu.c > @@ -4276,7 +4276,7 @@ static int intel_iommu_attach_device(struct > iommu_domain *domain, > __func__, addr_width, dmar_domain->max_addr); > return -EFAULT; > } > - dmar_domain->gaw = addr_width; > + dmar_domain->gaw = min(addr_width, dmar_domain->gaw); > > /* > * Knock out extra levels of page tables if necessary > >
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