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intel-iommu: fail DEVIOTLB_UNMAP without dt mode

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Without dt mode, device IOTLB notifier won't work since guest won't
send device IOTLB invalidation descriptor in this case. Let's fail
early instead of misbehaving silently.

Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Tested-by: Laurent Vivier <lvivier@redhat.com>
Tested-by: Viktor Prutyanov <viktor@daynix.com>
Buglink: https://bugzilla.redhat.com/2156876
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230223065924.42503-3-jasowang@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2023-02-23 14:59:21 +08:00 committed by Michael S. Tsirkin
parent b8d78277c0
commit 09adb0e021
1 changed files with 8 additions and 0 deletions
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8
hw/i386/intel_iommu.c
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@ -3179,6 +3179,7 @@ static int vtd_iommu_notify_flag_changed(IOMMUMemoryRegion *iommu,
{
VTDAddressSpace *vtd_as = container_of(iommu, VTDAddressSpace, iommu);
IntelIOMMUState *s = vtd_as->iommu_state;
X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s);
/* TODO: add support for VFIO and vhost users */
if (s->snoop_control) {
@ -3193,6 +3194,13 @@ static int vtd_iommu_notify_flag_changed(IOMMUMemoryRegion *iommu,
PCI_FUNC(vtd_as->devfn));
return -ENOTSUP;
}
if (!x86_iommu->dt_supported && (new & IOMMU_NOTIFIER_DEVIOTLB_UNMAP)) {
error_setg_errno(errp, ENOTSUP,
"device %02x.%02x.%x requires device IOTLB mode",
pci_bus_num(vtd_as->bus), PCI_SLOT(vtd_as->devfn),
PCI_FUNC(vtd_as->devfn));
return -ENOTSUP;
}
/* Update per-address-space notifier flags */
vtd_as->notifier_flags = new;