[PATCH v7 01/10] xen: introduce SHUTDOWN_soft_reset shutdown reason

[Vitaly Kuznetsov <vkuznets@redhat.com>]

This special type of shutdown is supposed to be used by PVHVM guests when
they want to perform some sort of kexec/kdump. Toolstack will have to build
a new domain with the memory content of the original domain and start executing
the new one from the point where SHUTDOWN_soft_reset was called. This operation
is not supported for PV domains including the hardware domain.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 xen/common/shutdown.c      | 6 ++++++
 xen/include/public/sched.h | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/xen/common/shutdown.c b/xen/common/shutdown.c
index 9cfbf7a..03a8641 100644
--- a/xen/common/shutdown.c
+++ b/xen/common/shutdown.c
@@ -66,6 +66,12 @@ void hwdom_shutdown(u8 reason)
         machine_restart(0);
         break; /* not reached */
 
+    case SHUTDOWN_soft_reset:
+        printk("Hardware domain %d did unsupported soft reset, rebooting.\n",
+               hardware_domain->domain_id);
+        machine_restart(0);
+        break; /* not reached */
+
     default:
         printk("Hardware Dom%u shutdown (unknown reason %u): ",
                hardware_domain->domain_id, reason);
diff --git a/xen/include/public/sched.h b/xen/include/public/sched.h
index 4000ac9..800c808 100644
--- a/xen/include/public/sched.h
+++ b/xen/include/public/sched.h
@@ -159,7 +159,8 @@ DEFINE_XEN_GUEST_HANDLE(sched_watchdog_t);
 #define SHUTDOWN_suspend    2  /* Clean up, save suspend info, kill.         */
 #define SHUTDOWN_crash      3  /* Tell controller we've crashed.             */
 #define SHUTDOWN_watchdog   4  /* Restart because watchdog time expired.     */
-#define SHUTDOWN_MAX        4  /* Maximum valid shutdown reason.             */
+#define SHUTDOWN_soft_reset 5  /* Soft reset, rebuild keeping memory content */
+#define SHUTDOWN_MAX        5  /* Maximum valid shutdown reason.             */
 /* ` } */
 
 #endif /* __XEN_PUBLIC_SCHED_H__ */
-- 
1.9.3