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SubjectRe: [ 102/127] iommu/amd: Workaround for ERBT1312
Alex, Andreas,

On Fri, Jun 28, 2013 at 08:42:05PM +0200, Andreas Hartmann wrote:
> You're right, there is exactly one entry directly after loading of vfio.
> I can see this message, too, with linux 3.4.43.

Can you please test this patch? It should reduce the noise
significantly, but a few of those error messages are still expected.

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index e3c2d74..74e1d1c 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1431,6 +1431,7 @@ static void init_device_table_dma(void)
for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
set_dev_entry_bit(devid, DEV_ENTRY_VALID);
set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION);
+ set_dev_entry_bit(devid, DEV_ENTRY_ONE_FAULT);
}
}

diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index 083f98c..4872b68 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -173,6 +173,7 @@
#define DEV_ENTRY_TRANSLATION 0x01
#define DEV_ENTRY_IR 0x3d
#define DEV_ENTRY_IW 0x3e
+#define DEV_ENTRY_ONE_FAULT 0x61
#define DEV_ENTRY_NO_PAGE_FAULT 0x62
#define DEV_ENTRY_EX 0x67
#define DEV_ENTRY_SYSMGT1 0x68


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