linux-kernel - [PATCH 2/3] iommu: Set default domain type at runtime

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Message-Id: <20190809152233.2829-3-joro@8bytes.org>
Date:   Fri,  9 Aug 2019 17:22:32 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Thomas.Lendacky@....com, Suravee.Suthikulpanit@....com,
        bp@...en8.de, Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 2/3] iommu: Set default domain type at runtime

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

Set the default domain-type at runtime, not at compile-time.
This keeps default domain type setting in one place when we
have to change it at runtime.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/iommu.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index b57ce00c1310..62cae6db0970 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -26,11 +26,8 @@
 
 static struct kset *iommu_group_kset;
 static DEFINE_IDA(iommu_group_ida);
-#ifdef CONFIG_IOMMU_DEFAULT_PASSTHROUGH
-static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY;
-#else
-static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA;
-#endif
+
+static unsigned int iommu_def_domain_type __read_mostly;
 static bool iommu_dma_strict __read_mostly = true;
 
 struct iommu_group {
@@ -102,6 +99,11 @@ static const char *iommu_domain_type_str(unsigned int t)
 
 static int __init iommu_subsys_init(void)
 {
+	if (IS_ENABLED(CONFIG_IOMMU_DEFAULT_PASSTHROUGH))
+		iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY;
+	else
+		iommu_def_domain_type = IOMMU_DOMAIN_DMA;
+
 	pr_info("Default domain type: %s\n",
 		iommu_domain_type_str(iommu_def_domain_type));
 
-- 
2.17.1