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vfio/common: Avoid unmap ram section at vfio_listener_region_del() in nested mode

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The ram section will be unmapped at vfio_prereg_listener_region_del()
in nested mode. So let's avoid unmap ram section at
vfio_listener_region_dev().

Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
This commit is contained in:
Chen Qun 2021-07-31 10:02:18 +08:00
parent 518ab37de3
commit 48e4f1552b
1 changed files with 39 additions and 0 deletions
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39
vfio-common-Avoid-unmap-ram-section-at-vfio_listener.patch Normal file
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@ -0,0 +1,39 @@
From 55f3bdd0866be2b1a6223bacf9e00a032daf957c Mon Sep 17 00:00:00 2001
From: Kunkun Jiang <jiangkunkun@huawei.com>
Date: Sat, 31 Jul 2021 10:02:18 +0800
Subject: [PATCH] vfio/common: Avoid unmap ram section at
vfio_listener_region_del() in nested mode
The ram section will be unmapped at vfio_prereg_listener_region_del()
in nested mode. So let's avoid unmap ram section at
vfio_listener_region_dev().
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
---
hw/vfio/common.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 98dc9e6f84..21a866e545 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1179,6 +1179,16 @@ static void vfio_listener_region_del(MemoryListener *listener,
}
}
+ /*
+ * In nested mode, stage 2 (gpa->hpa) and the stage 1
+ * (giova->gpa) are set separately. The ram section
+ * will be unmapped in vfio_prereg_listener_region_del().
+ * Hence it doesn't need to unmap ram section here.
+ */
+ if (container->iommu_type == VFIO_TYPE1_NESTING_IOMMU) {
+ return;
+ }
+
/*
* FIXME: We assume the one big unmap below is adequate to
* remove any individual page mappings in the IOMMU which
--
2.27.0