linux-kernel - [PATCH 1/4] iommu/amd: Finish TLB flush in amd_iommu

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Date:   Fri, 13 Oct 2017 16:40:10 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     iommu@...ts.linux-foundation.org,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Joerg Roedel <jroedel@...e.de>, stable@...r.kernel.org,
        #@...tes.org, =@...tes.org, 2.6.33@...tes.org
Subject: [PATCH 1/4] iommu/amd: Finish TLB flush in amd_iommu_unmap()

From: Joerg Roedel <jroedel@...e.de>

The function only sends the flush command to the IOMMU(s),
but does not wait for its completion when it returns. Fix
that.

Fixes: 601367d76bd1 ('x86/amd-iommu: Remove iommu_flush_domain function')
Cc: stable@...r.kernel.org # >= 2.6.33
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/amd_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index cb7c531..3a702c4 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3046,6 +3046,7 @@ static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
 	mutex_unlock(&domain->api_lock);
 
 	domain_flush_tlb_pde(domain);
+	domain_flush_complete(domain);
 
 	return unmap_size;
 }
-- 
2.7.4