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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org On 8/19/19 8:22 AM, Joerg Roedel wrote: > From: Joerg Roedel > > Using Passthrough mode when SME is active causes certain > devices to use the SWIOTLB bounce buffer. The bounce buffer > code has an upper limit of 256kb for the size of DMA > allocations, which is too small for certain devices and > causes them to fail. > > With this patch we enable IOMMU by default when SME is > active in the system, making the default configuration work > for more systems than it does now. > > Users that don't want IOMMUs to be enabled still can disable > them with kernel parameters. > > Signed-off-by: Joerg Roedel Reviewed-by: Tom Lendacky Tested-by: Tom Lendacky > --- > drivers/iommu/iommu.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c > index 01759d4ac70b..ec18c9630e93 100644 > --- a/drivers/iommu/iommu.c > +++ b/drivers/iommu/iommu.c > @@ -119,6 +119,11 @@ static int __init iommu_subsys_init(void) > iommu_set_default_passthrough(false); > else > iommu_set_default_translated(false); > + > + if (iommu_default_passthrough() && sme_active()) { > + pr_info("SME detected - Disabling default IOMMU Passthrough\n"); > + iommu_set_default_translated(false); > + } > } > > pr_info("Default domain type: %s %s\n", > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu