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intel-iommu: fail DEVIOTLB_UNMAP without dt mode 

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>
(cherry picked from commit 09adb0e021)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Jason Wang 2023-02-23 14:59:21 +08:00 committed by Michael Tokarev
parent f6d602d078
commit b05232a256
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;