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Message-Id: <1541544435-52624-1-git-send-email-jacob.jun.pan@linux.intel.com>
Date: Tue, 6 Nov 2018 14:47:15 -0800
From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>, iommu@...ts.linux-foundation.org,
LKML <linux-kernel@...r.kernel.org>
Cc: "Lu Baolu" <baolu.lu@...ux.intel.com>,
"Mehta, Sohil" <sohil.mehta@...el.com>,
Jacob Pan <jacob.jun.pan@...ux.intel.com>,
Ashok Raj <ashok.raj@...el.com>
Subject: [PATCH v2] iommu/vt-d: respect max guest address width in agaw
Supported guest address witdh (SGAW) only indicates
what the iommu's capabilities are wrt page table levels
for second level page-tables. IOMMU should pick the
right level depending on the Maximum Guest Address Width
(MGAW).
For pass-through translation type, address width must be
programmed with the largest AGAW supported by the HW.
Reported-by: Ramos Falcon, Ernesto R <ernesto.r.ramos.falcon@...el.com>
Signed-off-by: Ashok Raj <ashok.raj@...el.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
drivers/iommu/intel-iommu.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 140d6ab..f16db3b 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -719,7 +719,11 @@ int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
*/
int iommu_calculate_agaw(struct intel_iommu *iommu)
{
- return __iommu_calculate_agaw(iommu, DEFAULT_DOMAIN_ADDRESS_WIDTH);
+ unsigned long mgaw;
+
+ /* Respect Max Guest Address Width */
+ mgaw = min(cap_mgaw(iommu->cap), DEFAULT_DOMAIN_ADDRESS_WIDTH);
+ return __iommu_calculate_agaw(iommu, mgaw);
}
/* This functionin only returns single iommu in a domain */
--
2.7.4
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