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From edde0b6a805085255bccc0ccdc3b9b6f81cef37b Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
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Date: Tue, 23 Aug 2022 20:20:02 +0200
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Subject: [PATCH 03/23] vdpa: Skip the maps not in the iova tree
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Eugenio Pérez <eperezma@redhat.com>
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RH-MergeRequest: 116: vdpa: Restore device state on destination
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RH-Bugzilla: 2114060
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RH-Acked-by: Cindy Lu <lulu@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [2/21] 73acd16375a17cdf4c58830386541dd3a1b18bf7 (eperezmartin/qemu-kvm)
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2114060
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Upstream status: git@github.com:jasowang/qemu.git net-next
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Next patch will skip the registering of dma maps that the vdpa device
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rejects in the iova tree. We need to consider that here or we cause a
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SIGSEGV accessing result.
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Reported-by: Lei Yang <leiyang@redhat.com>
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Acked-by: Jason Wang <jasowang@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit a92ca0ffee5858636432a6059eb2790df1c9c77f)
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---
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hw/virtio/vhost-vdpa.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
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index 96334ab5b6..aa7765c6bc 100644
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--- a/hw/virtio/vhost-vdpa.c
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+++ b/hw/virtio/vhost-vdpa.c
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@@ -287,6 +287,10 @@ static void vhost_vdpa_listener_region_del(MemoryListener *listener,
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};
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result = vhost_iova_tree_find_iova(v->iova_tree, &mem_region);
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+ if (!result) {
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+ /* The memory listener map wasn't mapped */
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+ return;
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+ }
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iova = result->iova;
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vhost_iova_tree_remove(v->iova_tree, result);
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}
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--
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2.31.1
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