Hello, On 29/03/2024 01:08, Volodymyr Babchuk wrote: > > > I encountered platform, namely Qualcomm SA8155P where SMMU-compatible NIT: a commit msg should be written in imperative mood
> IO-MMU advertises more context IQRs than there are context banks. This > should not be an issue, we need to relax the check in the SMMU driver > to allow such configuration. > > Signed-off-by: Volodymyr Babchuk <volodymyr_babc...@epam.com> > --- > xen/drivers/passthrough/arm/smmu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/xen/drivers/passthrough/arm/smmu.c > b/xen/drivers/passthrough/arm/smmu.c > index 32e2ff279b..2dd3688f3b 100644 > --- a/xen/drivers/passthrough/arm/smmu.c > +++ b/xen/drivers/passthrough/arm/smmu.c > @@ -2550,7 +2550,7 @@ static int arm_smmu_device_dt_probe(struct > platform_device *pdev) > parse_driver_options(smmu); > > if (smmu->version > ARM_SMMU_V1 && > - smmu->num_context_banks != smmu->num_context_irqs) { > + smmu->num_context_banks > smmu->num_context_irqs) { This was done in Linux by commit: d1e20222d537 ("iommu/arm-smmu: Error out only if not enough context interrupts") However, they also ignore superfluous interrupts. Shouldn't we do the same? ~Michal