From: Joerg Roedel Date: Tue, 26 Jul 2016 13:18:54 +0000 (+0200) Subject: iommu/amd: Update Alias-DTE in update_device_table() X-Git-Tag: firefly_0821_release~176^2~4^2~31^2~375 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c5612d4370098aa0528dfe20cc5698acaf94c4af;p=firefly-linux-kernel-4.4.55.git iommu/amd: Update Alias-DTE in update_device_table() commit 3254de6bf74fe94c197c9f819fe62a3a3c36f073 upstream. Not doing so might cause IO-Page-Faults when a device uses an alias request-id and the alias-dte is left in a lower page-mode which does not cover the address allocated from the iova-allocator. Fixes: 492667dacc0a ('x86/amd-iommu: Remove amd_iommu_pd_table') Signed-off-by: Joerg Roedel Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index e54e335d082b..0397985a2601 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -2324,8 +2324,15 @@ static void update_device_table(struct protection_domain *domain) { struct iommu_dev_data *dev_data; - list_for_each_entry(dev_data, &domain->dev_list, list) + list_for_each_entry(dev_data, &domain->dev_list, list) { set_dte_entry(dev_data->devid, domain, dev_data->ats.enabled); + + if (dev_data->devid == dev_data->alias) + continue; + + /* There is an alias, update device table entry for it */ + set_dte_entry(dev_data->alias, domain, dev_data->ats.enabled); + } } static void update_domain(struct protection_domain *domain)