[PATCH v3 13/25] 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. It holds the max domid among the initial
domains.

Move the discard_initial_modules after DomUs have been built.

First create domUs, then start dom0 -- no point in trying to start dom0
when the cpu is busy.

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
CC: andrew.cooper3@citrix.com
CC: jbeulich@suse.com
---
Changes in v3:
- move patch earlier and introduce empty construct_domU to fix bisection
  builds
- fix max_init_domid to actually hold the max domid among initial
  domains (instead of max_domid + 1)
- move domain_unpause_by_systemcontroller(dom0) after creating domUs

Changes in v2:
- coding style
- set nr_spis to 32
- introduce create_domUs
---
 xen/arch/arm/domain_build.c | 42 +++++++++++++++++++++++++++++++++++++++---
 xen/arch/arm/setup.c        |  7 ++++++-
 xen/include/asm-arm/setup.h |  3 +++
 xen/include/asm-x86/setup.h |  2 ++
 4 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 0835340..8f7ac54 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>
@@ -2205,6 +2206,43 @@ 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)
+{
+    return 0;
+}
+
+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 = {
+                .arch.gic_version = XEN_DOMCTL_CONFIG_GIC_NATIVE,
+                .arch.nr_spis = 32,
+            };
+
+            if ( !dt_device_is_compatible(node, "xen,domain") )
+                continue;
+
+            d = domain_create(++max_init_domid, &d_cfg, false);
+            if ( IS_ERR(d) )
+                panic("Error creating domain %s", dt_node_name(node));
+
+            d->is_console = 1;
+
+            if ( construct_domU(d, node) != 0 )
+                panic("Could not set up domain %s", dt_node_name(node));
+
+            domain_unpause_by_systemcontroller(d);
+        }
+    }
+}
+
 int __init construct_dom0(struct domain *d)
 {
     const struct bootcmdline *kernel = boot_cmdline_find_by_kind(BOOTMOD_KERNEL);
@@ -2258,9 +2296,7 @@ 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 c320df9..096484f 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -63,8 +63,11 @@ 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)
 {
+    discard_initial_modules();
     free_init_memory();
     startup_cpu_idle_loop();
 }
@@ -894,7 +897,7 @@ 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, true);
+    dom0 = domain_create(max_init_domid, &dom0_cfg, true);
     if ( IS_ERR(dom0) || (alloc_dom0_vcpu0(dom0) == NULL) )
             panic("Error creating domain 0");
 
@@ -915,6 +918,8 @@ void __init start_xen(unsigned long boot_phys_offset,
     /* Must be done past setting system_state. */
     unregister_init_virtual_region();
 
+    create_domUs();
+
     domain_unpause_by_systemcontroller(dom0);
 
     /* Switch on to the dynamically allocated stack for the idle vcpu
diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h
index 4551f72..d9cd8e1 100644
--- a/xen/include/asm-arm/setup.h
+++ b/xen/include/asm-arm/setup.h
@@ -67,6 +67,8 @@ 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);
@@ -83,6 +85,7 @@ 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 8d4b9ee..c0bd86f 100644
--- a/xen/include/asm-x86/setup.h
+++ b/xen/include/asm-x86/setup.h
@@ -66,4 +66,6 @@ extern bool opt_dom0_shadow;
 #endif
 extern bool dom0_pvh;
 
+#define max_init_domid (0)
+
 #endif
-- 
1.9.1


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