[PATCH v2 19/21] xen/arm: introduce create_domUs

[Stefano Stabellini <sstabellini@kernel.org>]

Call a new function, "create_domUs", from setup_xen to start DomU VMs.

Introduce support for the "xen,domU" compatible node on device tree.
Create new DomU VMs based on the information found on device tree under
"xen,domU". Calls construct_domU for each domain.

Introduce a simple global variable named max_init_domid to keep track of
the initial allocated domids.

Move the discard_initial_modules after DomUs have been built

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
CC: andrew.cooper3@citrix.com
CC: jbeulich@suse.com
---
Changes in v2:
- coding style
- set nr_spis to 32
- introduce create_domUs
---
 xen/arch/arm/domain_build.c | 38 +++++++++++++++++++++++++++++++++++---
 xen/arch/arm/setup.c        |  8 +++++++-
 xen/include/asm-arm/setup.h |  3 +++
 xen/include/asm-x86/setup.h |  2 ++
 4 files changed, 47 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index d7e9040..9f58002 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -7,6 +7,7 @@
 #include <asm/irq.h>
 #include <asm/regs.h>
 #include <xen/errno.h>
+#include <xen/err.h>
 #include <xen/device_tree.h>
 #include <xen/libfdt/libfdt.h>
 #include <xen/guest_access.h>
@@ -2542,6 +2543,39 @@ static int __init construct_domU(struct domain *d, struct dt_device_node *node)
     return rc;
 }
 
+void __init create_domUs(void)
+{
+    struct dt_device_node *node;
+    struct dt_device_node *chosen = dt_find_node_by_name(dt_host, "chosen");
+    if ( chosen != NULL )
+    {
+        dt_for_each_child_node(chosen, node)
+        {
+            struct domain *d;
+            struct xen_domctl_createdomain d_cfg = {};
+
+            if ( !dt_device_is_compatible(node, "xen,domain") )
+                continue;
+
+            d_cfg.arch.gic_version = XEN_DOMCTL_CONFIG_GIC_NATIVE;
+            d_cfg.arch.nr_spis = 32;
+
+            d = domain_create(max_init_domid++, &d_cfg);
+            if ( IS_ERR(d) )
+                panic("Error creating domU");
+
+            d->is_privileged = 0;
+            d->is_console = 1;
+            d->target = NULL;
+
+            if ( construct_domU(d, node) != 0 )
+                printk("Could not set up DOMU guest OS");
+
+            domain_unpause_by_systemcontroller(d);
+        }
+    }
+}
+
 int __init construct_dom0(struct domain *d)
 {
     struct kernel_info kinfo = {};
@@ -2592,9 +2626,7 @@ int __init construct_dom0(struct domain *d)
         return rc;
 
 
-    rc = __construct_domain(d, &kinfo);
-    discard_initial_modules();
-    return rc;
+    return __construct_domain(d, &kinfo);
 }
 
 /*
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 7739a80..0b08af2 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -64,6 +64,8 @@ static unsigned long opt_xenheap_megabytes __initdata;
 integer_param("xenheap_megabytes", opt_xenheap_megabytes);
 #endif
 
+domid_t __read_mostly max_init_domid = 0;
+
 static __used void init_done(void)
 {
     free_init_memory();
@@ -863,7 +865,7 @@ void __init start_xen(unsigned long boot_phys_offset,
     dom0_cfg.arch.gic_version = XEN_DOMCTL_CONFIG_GIC_NATIVE;
     dom0_cfg.arch.nr_spis = gic_number_lines() - 32;
 
-    dom0 = domain_create(0, &dom0_cfg);
+    dom0 = domain_create(max_init_domid++, &dom0_cfg);
     if ( IS_ERR(dom0) || (alloc_dom0_vcpu0(dom0) == NULL) )
             panic("Error creating domain 0");
 
@@ -889,6 +891,10 @@ void __init start_xen(unsigned long boot_phys_offset,
 
     domain_unpause_by_systemcontroller(dom0);
 
+    create_domUs();
+
+    discard_initial_modules();
+
     /* Switch on to the dynamically allocated stack for the idle vcpu
      * since the static one we're running on is about to be freed. */
     memcpy(idle_vcpu[0]->arch.cpu_info, get_cpu_info(),
diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h
index 5ecfe27..21b9729 100644
--- a/xen/include/asm-arm/setup.h
+++ b/xen/include/asm-arm/setup.h
@@ -56,6 +56,8 @@ struct bootinfo {
 
 extern struct bootinfo bootinfo;
 
+extern domid_t max_init_domid;
+
 void arch_init_memory(void);
 
 void copy_from_paddr(void *dst, paddr_t paddr, unsigned long len);
@@ -72,6 +74,7 @@ void acpi_create_efi_mmap_table(struct domain *d,
 int acpi_make_efi_nodes(void *fdt, struct membank tbl_add[]);
 
 int construct_dom0(struct domain *d);
+void __init create_domUs(void);
 
 void discard_initial_modules(void);
 void dt_unreserved_regions(paddr_t s, paddr_t e,
diff --git a/xen/include/asm-x86/setup.h b/xen/include/asm-x86/setup.h
index 19232af..2fb9529 100644
--- a/xen/include/asm-x86/setup.h
+++ b/xen/include/asm-x86/setup.h
@@ -73,4 +73,6 @@ extern bool opt_dom0_shadow;
 #endif
 extern bool dom0_pvh;
 
+#define max_init_domid (1)
+
 #endif
-- 
1.9.1


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