[Xen-devel] [PATCH v3.1 07/15] xen/x86: do the PCI scan unconditionally

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Instead of being tied to the presence of an IOMMU. This avoids doing the
scan in two different places, and although it's only required for PVHv2
guests (that also require and IOMMU), it makes the code slightly easier to
follow.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Cc: Feng Wu <feng.wu@xxxxxxxxx>
---
Changes since v2:
 - Expand the commit message.
---
 xen/arch/x86/setup.c                        | 2 ++
 xen/drivers/passthrough/amd/pci_amd_iommu.c | 3 ++-
 xen/drivers/passthrough/vtd/iommu.c         | 2 --
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index b130671..72e7f24 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1491,6 +1491,8 @@ void __init noreturn __start_xen(unsigned long mbi_p)
 
     early_msi_init();
 
+    scan_pci_devices();
+
     iommu_setup();    /* setup iommu if available */
 
     smp_prepare_cpus(max_cpus);
diff --git a/xen/drivers/passthrough/amd/pci_amd_iommu.c 
b/xen/drivers/passthrough/amd/pci_amd_iommu.c
index 94a25a4..d12575d 100644
--- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
+++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
@@ -219,7 +219,8 @@ int __init amd_iov_detect(void)
 
     if ( !amd_iommu_perdev_intremap )
         printk(XENLOG_WARNING "AMD-Vi: Using global interrupt remap table is 
not recommended (see XSA-36)!\n");
-    return scan_pci_devices();
+
+    return 0;
 }
 
 static int allocate_domain_resources(struct domain_iommu *hd)
diff --git a/xen/drivers/passthrough/vtd/iommu.c 
b/xen/drivers/passthrough/vtd/iommu.c
index 48f120b..919993e 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -2299,8 +2299,6 @@ int __init intel_vtd_setup(void)
     P(iommu_hap_pt_share, "Shared EPT tables");
 #undef P
 
-    scan_pci_devices();
-
     ret = init_vtd_hw();
     if ( ret )
         goto error;
-- 
2.7.4 (Apple Git-66)


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