[PATCH v3 14/25] xen/arm: introduce construct_domU

[Stefano Stabellini <sstabellini@kernel.org>]

Similar to construct_dom0, construct_domU creates a barebone DomU guest.

The device tree node passed as argument is compatible "xen,domain", see
docs/misc/arm/device-tree/booting.txt.

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>

---
Changes in v3:
- move setting type before allocate_memory
- add ifdef around it and a comment

Changes in v2:
- rename mem to memory
- make cpus and memory mandatory
- remove wront comment from commit message
- cpus and memory are read as integers
- read the vpl011 option
---
 xen/arch/arm/domain_build.c | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 8f7ac54..101cca2 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -2208,7 +2208,41 @@ static int __init __construct_domain(struct domain *d, struct kernel_info *kinfo
 
 static int __init construct_domU(struct domain *d, struct dt_device_node *node)
 {
-    return 0;
+    struct kernel_info kinfo = {};
+    int rc;
+    u32 mem;
+
+    printk("*** LOADING DOMU ***\n");
+
+    rc = dt_property_read_u32(node, "cpus", &d->max_vcpus);
+    if ( !rc )
+        return -EINVAL;
+
+    rc = dt_property_read_u32(node, "memory", &mem);
+    if ( !rc )
+        return -EINVAL;
+    kinfo.unassigned_mem = (paddr_t)mem << 10;
+
+    d->vcpu = xzalloc_array(struct vcpu *, d->max_vcpus);
+    if ( !d->vcpu )
+        return -ENOMEM;;
+    if ( alloc_vcpu(d, 0, 0) == NULL )
+        return -ENOMEM;
+    d->max_pages = ~0U;
+
+    kinfo.d = d;
+
+    rc = kernel_probe(&kinfo, node);
+    if ( rc < 0 )
+        return rc;
+
+#ifdef CONFIG_ARM_64
+    /* type must be set before allocate memory */
+    d->arch.type = kinfo.type;
+#endif
+    allocate_memory(d, &kinfo);
+
+    return __construct_domain(d, &kinfo);
 }
 
 void __init create_domUs(void)
-- 
1.9.1


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