linux-kernel - [PATCH 2/6] vfio/iommu_type1: Ignore external domain when promote pinned

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Date:   Thu, 7 Jan 2021 12:43:57 +0800
From:   Keqian Zhu <zhukeqian1@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <kvm@...r.kernel.org>,
        <kvmarm@...ts.cs.columbia.edu>,
        Alex Williamson <alex.williamson@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Will Deacon <will@...nel.org>, "Marc Zyngier" <maz@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>
CC:     Mark Rutland <mark.rutland@....com>,
        James Morse <james.morse@....com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        "Daniel Lezcano" <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexios Zavras <alexios.zavras@...el.com>,
        <wanghaibin.wang@...wei.com>, <jiangkunkun@...wei.com>
Subject: [PATCH 2/6] vfio/iommu_type1: Ignore external domain when promote pinned_scope

The pinned_scope of external domain's groups are always true, that's
to say we can safely ignore external domain when promote pinned_scope
status of vfio_iommu.

Signed-off-by: Keqian Zhu <zhukeqian1@...wei.com>
---
 drivers/vfio/vfio_iommu_type1.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 334a8240e1da..110ada24ee91 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1637,14 +1637,7 @@ static void promote_pinned_page_dirty_scope(struct vfio_iommu *iommu)
 		}
 	}
 
-	if (iommu->external_domain) {
-		domain = iommu->external_domain;
-		list_for_each_entry(group, &domain->group_list, next) {
-			if (!group->pinned_page_dirty_scope)
-				return;
-		}
-	}
-
+	/* The external domain always passes check */
 	iommu->pinned_page_dirty_scope = true;
 }
 
@@ -2347,7 +2340,6 @@ static void vfio_iommu_type1_detach_group(void *iommu_data,
 	if (iommu->external_domain) {
 		group = find_iommu_group(iommu->external_domain, iommu_group);
 		if (group) {
-			promote_dirty_scope = !group->pinned_page_dirty_scope;
 			list_del(&group->next);
 			kfree(group);
 
@@ -2360,7 +2352,8 @@ static void vfio_iommu_type1_detach_group(void *iommu_data,
 				kfree(iommu->external_domain);
 				iommu->external_domain = NULL;
 			}
-			goto detach_group_done;
+			mutex_unlock(&iommu->lock);
+			return;
 		}
 	}
 
@@ -2408,7 +2401,6 @@ static void vfio_iommu_type1_detach_group(void *iommu_data,
 	else
 		vfio_iommu_iova_free(&iova_copy);
 
-detach_group_done:
 	/*
 	 * Removal of a group without dirty tracking may allow the iommu scope
 	 * to be promoted.
-- 
2.19.1