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intel_iommu: Check compatibility with host IOMMU capabilities 

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
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@ -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;