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From 8c5154729effda3f762bfb8224f9c61dab8b2986 Mon Sep 17 00:00:00 2001
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From: eperezma <eperezma@redhat.com>
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Date: Tue, 12 Jan 2021 14:36:38 -0500
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Subject: [PATCH 14/17] memory: Skip bad range assertion if notifier is
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DEVIOTLB_UNMAP type
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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: eperezma <eperezma@redhat.com>
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Message-id: <20210112143638.374060-14-eperezma@redhat.com>
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Patchwork-id: 100606
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O-Subject: [RHEL-8.4.0 qemu-kvm PATCH v2 13/13] memory: Skip bad range assertion if notifier is DEVIOTLB_UNMAP type
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Bugzilla: 1843852
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RH-Acked-by: Xiao Wang <jasowang@redhat.com>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Auger Eric <eric.auger@redhat.com>
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Device IOTLB invalidations can unmap arbitrary ranges, eiter outside of
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the memory region or even [0, ~0ULL] for all the space. The assertion
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could be hit by a guest, and rhel7 guest effectively hit it.
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Reviewed-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Acked-by: Jason Wang <jasowang@redhat.com>
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Message-Id: <20201116165506.31315-6-eperezma@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit 1804857f19f612f6907832e35599cdb51d4ec764)
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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memory.c | 11 +++++++++--
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1 file changed, 9 insertions(+), 2 deletions(-)
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diff --git a/memory.c b/memory.c
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index 3bd99b8ac4a..5a4a80842d7 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -1916,6 +1916,7 @@ void memory_region_notify_iommu_one(IOMMUNotifier *notifier,
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{
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IOMMUTLBEntry *entry = &event->entry;
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hwaddr entry_end = entry->iova + entry->addr_mask;
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+ IOMMUTLBEntry tmp = *entry;
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if (event->type == IOMMU_NOTIFIER_UNMAP) {
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assert(entry->perm == IOMMU_NONE);
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@@ -1929,10 +1930,16 @@ void memory_region_notify_iommu_one(IOMMUNotifier *notifier,
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return;
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}
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- assert(entry->iova >= notifier->start && entry_end <= notifier->end);
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+ if (notifier->notifier_flags & IOMMU_NOTIFIER_DEVIOTLB_UNMAP) {
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+ /* Crop (iova, addr_mask) to range */
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+ tmp.iova = MAX(tmp.iova, notifier->start);
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+ tmp.addr_mask = MIN(entry_end, notifier->end) - tmp.iova;
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+ } else {
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+ assert(entry->iova >= notifier->start && entry_end <= notifier->end);
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+ }
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if (event->type & notifier->notifier_flags) {
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- notifier->notify(notifier, entry);
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+ notifier->notify(notifier, &tmp);
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}
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}
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--
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2.27.0
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