[RFC 36/38] x86/hyperlaunch: enable unpausing mulitple domains

["Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>]

This commit enables the domain builder to unpause all domains
that have been flagged to start on boot.

Signed-off-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
---
 xen/arch/x86/domain-builder/core.c        | 20 ++++++++++++++++++++
 xen/arch/x86/include/asm/boot-domain.h    |  8 +++++---
 xen/arch/x86/include/asm/domain-builder.h |  1 +
 xen/arch/x86/setup.c                      |  8 +++++++-
 4 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/domain-builder/core.c 
b/xen/arch/x86/domain-builder/core.c
index 2712703e17e6..fa01b8390a23 100644
--- a/xen/arch/x86/domain-builder/core.c
+++ b/xen/arch/x86/domain-builder/core.c
@@ -6,6 +6,7 @@
 #include <xen/init.h>
 #include <xen/kconfig.h>
 #include <xen/lib.h>
+#include <xen/sched.h>
 
 #include <asm/bootinfo.h>
 #include <asm/domain-builder.h>
@@ -206,6 +207,25 @@ unsigned int __init builder_create_domains(struct 
boot_info *bi)
     return build_count;
 }
 
+int __init builder_unpause_domains(struct boot_info *bi)
+{
+    int i, count = 0;
+
+    for ( i = 0; i < bi->nr_domains; i++ )
+    {
+        struct boot_domain *bd = &bi->domains[i];
+
+        if ( bd->capabilities & BUILD_CAPS_HARDWARE ||
+             bd->mode & BUILD_MODE_START_ON_BOOT )
+        {
+            domain_unpause_by_systemcontroller(bd->d);
+            count++;
+        }
+    }
+
+    return count;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/x86/include/asm/boot-domain.h 
b/xen/arch/x86/include/asm/boot-domain.h
index a574f4941ed3..b592aef84b27 100644
--- a/xen/arch/x86/include/asm/boot-domain.h
+++ b/xen/arch/x86/include/asm/boot-domain.h
@@ -22,9 +22,11 @@ struct boot_domain {
 #define BUILD_CAPS_XENSTORE      (1 << 2)
     uint32_t capabilities;
 
-                                          /* On     | Off    */
-#define BUILD_MODE_PARAVIRT      (1 << 0) /* PV     | PVH/HVM */
-#define BUILD_MODE_ENABLE_DM     (1 << 1) /* HVM    | PVH     */
+                                          /* On       | Off     */
+#define BUILD_MODE_PARAVIRT      (1 << 0) /* PV       | PVH/HVM */
+#define BUILD_MODE_ENABLE_DM     (1 << 1) /* HVM      | PVH     */
+#define BUILD_MODE_LONG          (1 << 2) /* 64 BIT   | 32 BIT  */
+#define BUILD_MODE_START_ON_BOOT (1 << 3) /* UNPAUSED | PAUSED  */
     uint32_t mode;
 
     unsigned long mem_pages;
diff --git a/xen/arch/x86/include/asm/domain-builder.h 
b/xen/arch/x86/include/asm/domain-builder.h
index 5dc5661bec07..df55cf52460c 100644
--- a/xen/arch/x86/include/asm/domain-builder.h
+++ b/xen/arch/x86/include/asm/domain-builder.h
@@ -9,6 +9,7 @@ int __init builder_get_cmdline(
 
 void builder_init(struct boot_info *bi);
 unsigned int builder_create_domains(struct boot_info *bi);
+int builder_unpause_domains(struct boot_info *bi);
 
 struct domain *arch_create_dom(
     struct boot_info *bi, struct boot_domain *bd);
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 09b1fc94426d..ba0dd427c81b 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -787,6 +787,7 @@ static inline bool using_2M_mapping(void)
 
 static void noreturn init_done(void)
 {
+    struct boot_info *bi = &xen_boot_info;
     void *va;
     unsigned long start, end;
     int err;
@@ -800,7 +801,12 @@ static void noreturn init_done(void)
     if ( IS_ENABLED(CONFIG_SELF_TESTS) && cpu_has_xen_shstk )
         stub_selftest();
 
-    domain_unpause_by_systemcontroller(dom0);
+    err = builder_unpause_domains(bi);
+    if ( err == 0 )
+        panic("domain builder: failed to schedule any domain to start\n");
+    else
+        printk("domain builder: unpaused %d of %d domains at boot\n", err,
+               bi->nr_domains);
 
     /* MUST be done prior to removing .init data. */
     unregister_init_virtual_region();
-- 
2.30.2