[xen master] vtd: refuse to enable IOMMU if the PCI scan fails

[patchbot@xxxxxxx]

commit 295f4c8bc2e6da4a4442efa115da4e1b393b3672
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Fri Dec 2 18:09:11 2016 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Dec 2 18:09:11 2016 +0100

    vtd: refuse to enable IOMMU if the PCI scan fails
    
    This provides uniform behavior between Intel and AMD IOMMU initialization, 
and
    is a requirement for PVHv2 Dom0, that depends on a working IOMMU plus the 
PCI
    bus being scanned for devices.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/drivers/passthrough/vtd/iommu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/vtd/iommu.c 
b/xen/drivers/passthrough/vtd/iommu.c
index 48f120b..78b5a6a 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -2299,7 +2299,9 @@ int __init intel_vtd_setup(void)
     P(iommu_hap_pt_share, "Shared EPT tables");
 #undef P
 
-    scan_pci_devices();
+    ret = scan_pci_devices();
+    if ( ret )
+        goto error;
 
     ret = init_vtd_hw();
     if ( ret )
--
generated by git-patchbot for /home/xen/git/xen.git#master

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