[xen staging] amd/iommu: assign iommu devices to Xen

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[xen staging] amd/iommu: assign iommu devices to Xen

commit b6bd02b7a877f9fac2de69e64d8245d56f92ab25
Author:     Roger Pau Monné <[hidden email]>
AuthorDate: Fri Nov 30 12:09:09 2018 +0100
Commit:     Jan Beulich <[hidden email]>
CommitDate: Fri Nov 30 12:09:09 2018 +0100

    amd/iommu: assign iommu devices to Xen
    AMD IOMMU devices are exposed on the PCI bus, and thus are assigned by
    default to the hardware domain. This can cause issues because the
    IOMMU devices themselves are not behind an IOMMU, so update_paging_mode will
    return an error if Xen tries to expand the page tables of a domain
    that has assigned devices not behind an IOMMU. update_paging_mode
    failing will cause the domain to be destroyed.
    Fix this by hiding PCI IOMMU devices, so they are not assigned to the
    hardware domain.
    Signed-off-by: Roger Pau Monné <[hidden email]>
    Reviewed-by: Jan Beulich <[hidden email]>
    Acked-by: Brian Woods <[hidden email]>
 xen/drivers/passthrough/amd/iommu_init.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/drivers/passthrough/amd/iommu_init.c b/xen/drivers/passthrough/amd/iommu_init.c
index 15c10b0929..17f39552a9 100644
--- a/xen/drivers/passthrough/amd/iommu_init.c
+++ b/xen/drivers/passthrough/amd/iommu_init.c
@@ -993,6 +993,8 @@ static void * __init allocate_ppr_log(struct amd_iommu *iommu)
 static int __init amd_iommu_init_one(struct amd_iommu *iommu)
+    pci_hide_device(iommu->seg, PCI_BUS(iommu->bdf), PCI_DEVFN2(iommu->bdf));
     if ( map_iommu_mmio_region(iommu) != 0 )
         goto error_out;
generated by git-patchbot for /home/xen/git/xen.git#staging

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