linux-kernel - [PATCH] iommu/amd: flush not present cache in iommu_map

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Message-Id: <20190424141900.8883-1-tmurphy@arista.com>
Date:   Wed, 24 Apr 2019 15:18:59 +0100
From:   Tom Murphy <tmurphy@...sta.com>
To:     iommu@...ts.linux-foundation.org
Cc:     murphyt7@....ie, Tom Murphy <tmurphy@...sta.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] iommu/amd: flush not present cache in iommu_map_page

check if there is a not-present cache present and flush it if there is.

Signed-off-by: Tom Murphy <tmurphy@...sta.com>
---
 drivers/iommu/amd_iommu.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index f7cdd2ab7f11..8ef43224aae0 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1636,6 +1636,12 @@ static int iommu_map_page(struct protection_domain *dom,
 		pte[i] = __pte;
 
 	update_domain(dom);
+	if (!dom->updated) {
+		if (unlikely(amd_iommu_np_cache)) {
+			domain_flush_pages(dom, bus_addr, page_size);
+			domain_flush_complete(dom);
+		}
+	}
 
 	/* Everything flushed out, free pages now */
 	free_page_list(freelist);
-- 
2.17.1