Linux IOMMU Development
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From: Sasha Levin <sashal-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: Sasha Levin <sashal-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
	Joerg Roedel <jroedel-l3A5Bk7waGM@public.gmane.org>
Subject: [PATCH AUTOSEL 4.14 30/32] iommu/amd: Set exclusion range correctly
Date: Fri, 26 Apr 2019 21:42:21 -0400	[thread overview]
Message-ID: <20190427014224.8274-30-sashal@kernel.org> (raw)
In-Reply-To: <20190427014224.8274-1-sashal-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>

From: Joerg Roedel <jroedel-l3A5Bk7waGM@public.gmane.org>

[ Upstream commit 3c677d206210f53a4be972211066c0f1cd47fe12 ]

The exlcusion range limit register needs to contain the
base-address of the last page that is part of the range, as
bits 0-11 of this register are treated as 0xfff by the
hardware for comparisons.

So correctly set the exclusion range in the hardware to the
last page which is _in_ the range.

Fixes: b2026aa2dce44 ('x86, AMD IOMMU: add functions for programming IOMMU MMIO space')
Signed-off-by: Joerg Roedel <jroedel-l3A5Bk7waGM@public.gmane.org>
Signed-off-by: Sasha Levin <sashal-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/iommu/amd_iommu_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index b97984a5ddad..9b3d8fd5f7c1 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -355,7 +355,7 @@ static void iommu_write_l2(struct amd_iommu *iommu, u8 address, u32 val)
 static void iommu_set_exclusion_range(struct amd_iommu *iommu)
 {
 	u64 start = iommu->exclusion_start & PAGE_MASK;
-	u64 limit = (start + iommu->exclusion_length) & PAGE_MASK;
+	u64 limit = (start + iommu->exclusion_length - 1) & PAGE_MASK;
 	u64 entry;
 
 	if (!iommu->exclusion_start)
-- 
2.19.1

WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
	iommu@lists.linux-foundation.org, Joerg Roedel <jroedel@suse.de>
Subject: [PATCH AUTOSEL 4.14 30/32] iommu/amd: Set exclusion range correctly
Date: Fri, 26 Apr 2019 21:42:21 -0400	[thread overview]
Message-ID: <20190427014224.8274-30-sashal@kernel.org> (raw)
Message-ID: <20190427014221.NvcJP_2jKyB5ykkeBadAIyuWUvNTwAD2d8IMh0J3gko@z> (raw)
In-Reply-To: <20190427014224.8274-1-sashal@kernel.org>

From: Joerg Roedel <jroedel@suse.de>

[ Upstream commit 3c677d206210f53a4be972211066c0f1cd47fe12 ]

The exlcusion range limit register needs to contain the
base-address of the last page that is part of the range, as
bits 0-11 of this register are treated as 0xfff by the
hardware for comparisons.

So correctly set the exclusion range in the hardware to the
last page which is _in_ the range.

Fixes: b2026aa2dce44 ('x86, AMD IOMMU: add functions for programming IOMMU MMIO space')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/amd_iommu_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index b97984a5ddad..9b3d8fd5f7c1 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -355,7 +355,7 @@ static void iommu_write_l2(struct amd_iommu *iommu, u8 address, u32 val)
 static void iommu_set_exclusion_range(struct amd_iommu *iommu)
 {
 	u64 start = iommu->exclusion_start & PAGE_MASK;
-	u64 limit = (start + iommu->exclusion_length) & PAGE_MASK;
+	u64 limit = (start + iommu->exclusion_length - 1) & PAGE_MASK;
 	u64 entry;
 
 	if (!iommu->exclusion_start)
-- 
2.19.1

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

       reply	other threads:[~2019-04-27  1:42 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190427014224.8274-1-sashal@kernel.org>
     [not found] ` <20190427014224.8274-1-sashal-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2019-04-27  1:42   ` Sasha Levin [this message]
2019-04-27  1:42     ` [PATCH AUTOSEL 4.14 30/32] iommu/amd: Set exclusion range correctly Sasha Levin

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