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intel_iommu: Check compatibility with host IOMMU capabilities

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If check fails, host device (either VFIO or VDPA device) is not
compatible with current vIOMMU config and should not be passed to
guest.

Only aw_bits is checked for now, we don't care about other caps
before scalable modern mode is introduced.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhenzhong Duan 2024-06-05 16:30:43 +08:00 • committed by Cédric Le Goater
parent a20910ca3e
commit 77f6efc0ab
1 changed files with 29 additions and 0 deletions
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29
hw/i386/intel_iommu.c
View file

@ -3837,6 +3837,30 @@ VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus,
return vtd_dev_as;
}
static bool vtd_check_hiod(IntelIOMMUState *s, HostIOMMUDevice *hiod,
Error **errp)
{
HostIOMMUDeviceClass *hiodc = HOST_IOMMU_DEVICE_GET_CLASS(hiod);
int ret;
if (!hiodc->get_cap) {
error_setg(errp, ".get_cap() not implemented");
return false;
}
/* Common checks */
ret = hiodc->get_cap(hiod, HOST_IOMMU_DEVICE_CAP_AW_BITS, errp);
if (ret < 0) {
return false;
}
if (s->aw_bits > ret) {
error_setg(errp, "aw-bits %d > host aw-bits %d", s->aw_bits, ret);
return false;
}
return true;
}
static bool vtd_dev_set_iommu_device(PCIBus *bus, void *opaque, int devfn,
HostIOMMUDevice *hiod, Error **errp)
{
@ -3857,6 +3881,11 @@ static bool vtd_dev_set_iommu_device(PCIBus *bus, void *opaque, int devfn,
return false;
}
if (!vtd_check_hiod(s, hiod, errp)) {
vtd_iommu_unlock(s);
return false;
}
new_key = g_malloc(sizeof(*new_key));
new_key->bus = bus;
new_key->devfn = devfn;