linux-kernel - [PATCH v8 5/7] iommu/vt-d: Don't switch off swiotlb if bounce page is used

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Date:   Fri, 30 Aug 2019 15:17:16 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christoph Hellwig <hch@....de>
Cc:     ashok.raj@...el.com, jacob.jun.pan@...el.com, alan.cox@...el.com,
        kevin.tian@...el.com, mika.westerberg@...ux.intel.com,
        Ingo Molnar <mingo@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        pengfei.xu@...el.com,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Jonathan Corbet <corbet@....net>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v8 5/7] iommu/vt-d: Don't switch off swiotlb if bounce page is used

The bounce page implementation depends on swiotlb. Hence, don't
switch off swiotlb if the system has untrusted devices or could
potentially be hot-added with any untrusted devices.

Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Kevin Tian <kevin.tian@...el.com>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Reviewed-by: Christoph Hellwig <hch@....de>
---
 drivers/iommu/Kconfig       |  1 +
 drivers/iommu/intel-iommu.c | 32 +++++++++++++++++---------------
 2 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index e15cdcd8cb3c..a4ddeade8ac4 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -182,6 +182,7 @@ config INTEL_IOMMU
 	select IOMMU_IOVA
 	select NEED_DMA_MAP_STATE
 	select DMAR_TABLE
+	select SWIOTLB
 	help
 	  DMA remapping (DMAR) devices support enables independent address
 	  translations for Direct Memory Access (DMA) from devices.
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index fee5dff16e95..eb2a13e39eca 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4575,22 +4575,20 @@ const struct attribute_group *intel_iommu_groups[] = {
 	NULL,
 };
 
-static int __init platform_optin_force_iommu(void)
+static inline bool has_untrusted_dev(void)
 {
 	struct pci_dev *pdev = NULL;
-	bool has_untrusted_dev = false;
 
-	if (!dmar_platform_optin() || no_platform_optin)
-		return 0;
+	for_each_pci_dev(pdev)
+		if (pdev->untrusted)
+			return true;
 
-	for_each_pci_dev(pdev) {
-		if (pdev->untrusted) {
-			has_untrusted_dev = true;
-			break;
-		}
-	}
+	return false;
+}
 
-	if (!has_untrusted_dev)
+static int __init platform_optin_force_iommu(void)
+{
+	if (!dmar_platform_optin() || no_platform_optin || !has_untrusted_dev())
 		return 0;
 
 	if (no_iommu || dmar_disabled)
@@ -4604,9 +4602,6 @@ static int __init platform_optin_force_iommu(void)
 		iommu_identity_mapping |= IDENTMAP_ALL;
 
 	dmar_disabled = 0;
-#if defined(CONFIG_X86) && defined(CONFIG_SWIOTLB)
-	swiotlb = 0;
-#endif
 	no_iommu = 0;
 
 	return 1;
@@ -4746,7 +4741,14 @@ int __init intel_iommu_init(void)
 	up_write(&dmar_global_lock);
 
 #if defined(CONFIG_X86) && defined(CONFIG_SWIOTLB)
-	swiotlb = 0;
+	/*
+	 * If the system has no untrusted device or the user has decided
+	 * to disable the bounce page mechanisms, we don't need swiotlb.
+	 * Mark this and the pre-allocated bounce pages will be released
+	 * later.
+	 */
+	if (!has_untrusted_dev() || intel_no_bounce)
+		swiotlb = 0;
 #endif
 	dma_ops = &intel_dma_ops;
 
-- 
2.17.1