[PATCH v3 2/3] svm: iommu: Only call guest_iommu_init() after initialized HVM domain

[<suravee.suthikulpanit@amd.com>]

From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>

The guest_iommu_init() is currently called by the following code path:

    arch/x86/domain.c: arch_domain_create()
      ]- drivers/passthrough/iommu.c: iommu_domain_init()
        |- drivers/passthrough/amd/pci_amd_iommu.c: amd_iommu_domain_init();
          |- drivers/passthrough/amd/iommu_guest.c: guest_iommu_init()

At this point, the hvm_domain_initialised() has not been called.
So register_mmio_handler() in guest_iommu_init() silently fails.
This patch moves the iommu_domain_init() to a later point after the
hvm_domain_intialise() instead.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 xen/arch/x86/domain.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 5af2cc5..0260e01 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -642,9 +642,6 @@ int arch_domain_create(struct domain *d, unsigned int domcr_flags,
 
         if ( (rc = init_domain_irq_mapping(d)) != 0 )
             goto fail;
-
-        if ( (rc = iommu_domain_init(d)) != 0 )
-            goto fail;
     }
     spin_lock_init(&d->arch.e820_lock);
 
@@ -660,6 +657,9 @@ int arch_domain_create(struct domain *d, unsigned int domcr_flags,
         /* 64-bit PV guest by default. */
         d->arch.is_32bit_pv = d->arch.has_32bit_shinfo = 0;
 
+    if ( !is_idle_domain(d) && (rc = iommu_domain_init(d)) != 0 )
+        goto fail_1;
+
     /* initialize default tsc behavior in case tools don't */
     tsc_set_info(d, TSC_MODE_DEFAULT, 0UL, 0, 0);
     spin_lock_init(&d->arch.vtsc_lock);
@@ -675,6 +675,9 @@ int arch_domain_create(struct domain *d, unsigned int domcr_flags,
 
     return 0;
 
+ fail_1:
+    if ( has_hvm_container_domain(d) )
+        hvm_domain_destroy(d);
  fail:
     d->is_dying = DOMDYING_dead;
     psr_domain_free(d);
-- 
1.9.1


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