linux-kernel - [PATCH v8 6/6] vfio/type1: remove duplicate retrieval of reserved regions

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Message-ID: <20190723160637.8384-7-shameerali.kolothum.thodi@huawei.com>
Date:   Tue, 23 Jul 2019 17:06:37 +0100
From:   Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
To:     <alex.williamson@...hat.com>, <eric.auger@...hat.com>
CC:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <iommu@...ts.linux-foundation.org>, <linuxarm@...wei.com>,
        <john.garry@...wei.com>, <xuwei5@...ilicon.com>,
        <kevin.tian@...el.com>,
        Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
Subject: [PATCH v8 6/6] vfio/type1: remove duplicate retrieval of reserved regions

As we now already have the reserved regions list, just pass that into
vfio_iommu_has_sw_msi() fn.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
Reviewed-by: Eric Auger <eric.auger@...hat.com>
---
 drivers/vfio/vfio_iommu_type1.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index d0c5e768acb7..a68405f24fbf 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1296,15 +1296,13 @@ static struct vfio_group *find_iommu_group(struct vfio_domain *domain,
 	return NULL;
 }
 
-static bool vfio_iommu_has_sw_msi(struct iommu_group *group, phys_addr_t *base)
+static bool vfio_iommu_has_sw_msi(struct list_head *group_resv_regions,
+				  phys_addr_t *base)
 {
-	struct list_head group_resv_regions;
-	struct iommu_resv_region *region, *next;
+	struct iommu_resv_region *region;
 	bool ret = false;
 
-	INIT_LIST_HEAD(&group_resv_regions);
-	iommu_get_group_resv_regions(group, &group_resv_regions);
-	list_for_each_entry(region, &group_resv_regions, list) {
+	list_for_each_entry(region, group_resv_regions, list) {
 		/*
 		 * The presence of any 'real' MSI regions should take
 		 * precedence over the software-managed one if the
@@ -1320,8 +1318,7 @@ static bool vfio_iommu_has_sw_msi(struct iommu_group *group, phys_addr_t *base)
 			ret = true;
 		}
 	}
-	list_for_each_entry_safe(region, next, &group_resv_regions, list)
-		kfree(region);
+
 	return ret;
 }
 
@@ -1768,7 +1765,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
 	if (ret)
 		goto out_detach;
 
-	resv_msi = vfio_iommu_has_sw_msi(iommu_group, &resv_msi_base);
+	resv_msi = vfio_iommu_has_sw_msi(&group_resv_regions, &resv_msi_base);
 
 	INIT_LIST_HEAD(&domain->group_list);
 	list_add(&group->next, &domain->group_list);
-- 
2.17.1