42 lines
1.7 KiB
Diff
42 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jason Wang <jasowang@redhat.com>
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Date: Thu, 23 Feb 2023 14:59:20 +0800
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Subject: [PATCH] intel-iommu: fail MAP notifier without caching mode
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Without caching mode, MAP notifier won't work correctly since guest
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won't send IOTLB update event when it establishes new mappings in the
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I/O page tables. Let's fail the IOMMU notifiers early instead of
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misbehaving silently.
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Reviewed-by: Eric Auger <eric.auger@redhat.com>
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Tested-by: Viktor Prutyanov <viktor@daynix.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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Message-Id: <20230223065924.42503-2-jasowang@redhat.com>
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Reviewed-by: Peter Xu <peterx@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 b8d78277c091f26fdd64f239bc8bb7e55d74cecf)
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Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
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---
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hw/i386/intel_iommu.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
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index a08ee85edf..9143376677 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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@@ -3186,6 +3186,13 @@ static int vtd_iommu_notify_flag_changed(IOMMUMemoryRegion *iommu,
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"Snoop Control with vhost or VFIO is not supported");
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return -ENOTSUP;
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}
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+ if (!s->caching_mode && (new & IOMMU_NOTIFIER_MAP)) {
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+ error_setg_errno(errp, ENOTSUP,
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+ "device %02x.%02x.%x requires caching mode",
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+ pci_bus_num(vtd_as->bus), PCI_SLOT(vtd_as->devfn),
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+ PCI_FUNC(vtd_as->devfn));
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+ return -ENOTSUP;
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+ }
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/* Update per-address-space notifier flags */
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vtd_as->notifier_flags = new;
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