[Xen-devel] [PATCH v2 13/21] xen/arm: introduce construct_domU

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

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@xxxxxxxxxx>

---
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 | 38 ++++++++++++++++++++++++++++++++++++++
 xen/include/asm-arm/setup.h |  1 +
 2 files changed, 39 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index ae3b16c..a4bc8fd 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -2223,6 +2223,44 @@ static int __init __construct_domain(struct domain *d, 
struct kernel_info *kinfo
     return 0;
 }
 
+static int __init construct_domU(struct domain *d, struct dt_device_node *node)
+{
+    struct kernel_info kinfo = {};
+    int rc;
+    u32 mem, vpl011 = 0;
+
+    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 << 20;
+
+    dt_property_read_u32(node, "memory", &vpl011);
+
+    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;
+
+    d->arch.type = kinfo.type;
+    allocate_memory(d, &kinfo);
+
+    return __construct_domain(d, &kinfo);
+}
+
 int __init construct_dom0(struct domain *d)
 {
     struct kernel_info kinfo = {};
diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h
index d0e23f4..5ecfe27 100644
--- a/xen/include/asm-arm/setup.h
+++ b/xen/include/asm-arm/setup.h
@@ -2,6 +2,7 @@
 #define __ARM_SETUP_H_
 
 #include <public/version.h>
+#include <xen/device_tree.h>
 
 #define MIN_FDT_ALIGN 8
 #define MAX_FDT_SIZE SZ_2M
-- 
1.9.1


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