linux-kernel - Re: [ 102/127] iommu/amd: Workaround for ERBT1312

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Date:	Fri, 28 Jun 2013 21:23:19 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Andreas Hartmann <andihartmann@...19freenet.de>,
	Alex Williamson <alex.williamson@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [ 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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