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From 80fe503d7c126fa2be6cc424593cae6c522f65e0 Mon Sep 17 00:00:00 2001
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From: Peter Xu <peterx@redhat.com>
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Date: Thu, 8 Nov 2018 05:37:21 +0100
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Subject: [PATCH 14/22] intel_iommu: handle invalid ce for shadow sync
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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: Peter Xu <peterx@redhat.com>
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Message-id: <20181108053721.13162-8-peterx@redhat.com>
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Patchwork-id: 82958
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O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 7/7] intel_iommu: handle invalid ce for shadow sync
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Bugzilla: 1627272
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RH-Acked-by: Auger Eric <eric.auger@redhat.com>
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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We should handle VTD_FR_CONTEXT_ENTRY_P properly when synchronizing
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shadow page tables. Having invalid context entry there is perfectly
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valid when we move a device out of an existing domain. When that
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happens, instead of posting an error we invalidate the whole region.
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Without this patch, QEMU will crash if we do these steps:
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(1) start QEMU with VT-d IOMMU and two 10G NICs (ixgbe)
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(2) bind the NICs with vfio-pci in the guest
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(3) start testpmd with the NICs applied
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(4) stop testpmd
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(5) rebind the NIC back to ixgbe kernel driver
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The patch should fix it.
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Reported-by: Pei Zhang <pezhang@redhat.com>
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Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1627272
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: Eric Auger <eric.auger@redhat.com>
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Reviewed-by: Maxime Coquelin <maxime.coquelin@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 c28b535d083d0a263d38d9ceeada83cdae8c64f0)
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/i386/intel_iommu.c | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
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index c95128d..12af410 100644
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--- a/hw/i386/intel_iommu.c
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+++ b/hw/i386/intel_iommu.c
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@@ -38,6 +38,7 @@
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#include "trace.h"
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static void vtd_address_space_refresh_all(IntelIOMMUState *s);
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+static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n);
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static void vtd_define_quad(IntelIOMMUState *s, hwaddr addr, uint64_t val,
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uint64_t wmask, uint64_t w1cmask)
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@@ -1066,11 +1067,27 @@ static int vtd_sync_shadow_page_table(VTDAddressSpace *vtd_as)
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{
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int ret;
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VTDContextEntry ce;
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+ IOMMUNotifier *n;
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ret = vtd_dev_to_context_entry(vtd_as->iommu_state,
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pci_bus_num(vtd_as->bus),
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vtd_as->devfn, &ce);
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if (ret) {
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+ if (ret == -VTD_FR_CONTEXT_ENTRY_P) {
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+ /*
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+ * It's a valid scenario to have a context entry that is
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+ * not present. For example, when a device is removed
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+ * from an existing domain then the context entry will be
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+ * zeroed by the guest before it was put into another
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+ * domain. When this happens, instead of synchronizing
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+ * the shadow pages we should invalidate all existing
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+ * mappings and notify the backends.
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+ */
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+ IOMMU_NOTIFIER_FOREACH(n, &vtd_as->iommu) {
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+ vtd_address_space_unmap(vtd_as, n);
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+ }
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+ ret = 0;
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+ }
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return ret;
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}
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--
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1.8.3.1
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