Hi Huang, On Thu, Mar 11, 2021 at 10:28:07PM +0800, Huang Rui wrote: > diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c > index f0adbc48fd17..a08e885403b7 100644 > --- a/drivers/iommu/amd/iommu.c > +++ b/drivers/iommu/amd/iommu.c > @@ -3862,7 +3862,7 @@ static int irq_remapping_select(struct irq_domain *d, struct irq_fwspec *fwspec, > else if (x86_fwspec_is_hpet(fwspec)) > devid = get_hpet_devid(fwspec->param[0]); > > - if (devid < 0) > + if (devid < 0 || !amd_iommu_rlookup_table) > return 0; The problem is deeper than this fix suggests. I prepared other fixes for this particular problem. Please find them here: https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/log/?h=iommu-fixes Regards, Joerg
