[Patch v3 09/12] iommu/amd: Don't update the domain information to iommu dev before dev init

[Baoquan He]

Don't update the domain information to the related DTE entry before
iommu dev initialization. For this a new member 'domain_updated' is
added to iommu_dev_data.

Signed-off-by: Baoquan He <b...@redhat.com>
---
 drivers/iommu/amd_iommu.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index c0b96e0..b6e669c 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -101,6 +101,7 @@ struct iommu_dev_data {
        bool pri_tlp;                     /* PASID TLB required for
                                             PPR completions */
        u32 errata;                       /* Bitmap for errata to apply */
+       bool domain_updated;
 };
 
 /*
@@ -2046,12 +2047,14 @@ static void do_attach(struct iommu_dev_data *dev_data,
        domain->dev_iommu[iommu->index] += 1;
        domain->dev_cnt                 += 1;
 
-       /* Update device table */
-       set_dte_entry(dev_data->devid, domain, ats);
-       if (alias != dev_data->devid)
+       if (!translation_pre_enabled() || dev_data->domain_updated) {
+               /* Update device table */
                set_dte_entry(dev_data->devid, domain, ats);
+               if (alias != dev_data->devid)
+                       set_dte_entry(dev_data->devid, domain, ats);
 
-       device_flush_dte(dev_data);
+               device_flush_dte(dev_data);
+       }
 }
 
 static void do_detach(struct iommu_dev_data *dev_data)
@@ -2402,7 +2405,8 @@ 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)
-               set_dte_entry(dev_data->devid, domain, dev_data->ats.enabled);
+               if (!translation_pre_enabled() || dev_data->domain_updated)
+                       set_dte_entry(dev_data->devid, domain, 
dev_data->ats.enabled);
 }
 
 static void update_domain(struct protection_domain *domain)
-- 
2.1.0

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