[edk2-devel] [PATCH 2/3] OvmfPkg/XenHypercallLib: Add SchedOp hypercall

[Anthony PERARD via groups.io]

From: Anthony PERARD <anthony.perard at citrix.com>

Add a new function to allow to make an hypercall to shutdown the
machine.

This import "sched.h" public header from Xen Project's repo. Some
changes have been made to be closer to EDK2's coding style.

Signed-off-by: Anthony PERARD <anthony.perard at citrix.com>
---
 OvmfPkg/Include/IndustryStandard/Xen/sched.h  | 50 +++++++++++++++++++
 OvmfPkg/Include/Library/XenHypercallLib.h     |  7 +++
 .../Library/XenHypercallLib/XenHypercall.c    | 14 ++++++
 3 files changed, 71 insertions(+)
 create mode 100644 OvmfPkg/Include/IndustryStandard/Xen/sched.h

diff --git a/OvmfPkg/Include/IndustryStandard/Xen/sched.h b/OvmfPkg/Include/IndustryStandard/Xen/sched.h
new file mode 100644
index 000000000000..b050354efe8d
--- /dev/null
+++ b/OvmfPkg/Include/IndustryStandard/Xen/sched.h
@@ -0,0 +1,50 @@
+/******************************************************************************
+ * sched.h
+ *
+ * Scheduler state interactions
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright (c) 2005, Keir Fraser <keir at xensource.com>
+ */
+
+#ifndef __XEN_PUBLIC_SCHED_H__
+#define __XEN_PUBLIC_SCHED_H__
+
+#include "event_channel.h"
+
+/*
+ * Halt execution of this domain (all VCPUs) and notify the system controller.
+ * @arg == pointer to sched_shutdown_t structure.
+ *
+ * If the sched_shutdown_t reason is SHUTDOWN_suspend then
+ * x86 PV guests must also set RDX (EDX for 32-bit guests) to the MFN
+ * of the guest's start info page.  RDX/EDX is the third hypercall
+ * argument.
+ *
+ * In addition, which reason is SHUTDOWN_suspend this hypercall
+ * returns 1 if suspend was cancelled or the domain was merely
+ * checkpointed, and 0 if it is resuming in a new domain.
+ */
+#define XEN_SCHEDOP_SHUTDOWN  2
+
+struct _XEN_SCHED_SHUTDOWN {
+  unsigned int    Reason; /* SHUTDOWN_* => enum sched_shutdown_reason */
+};
+
+typedef struct _XEN_SCHED_SHUTDOWN XEN_SCHED_SHUTDOWN;
+DEFINE_XEN_GUEST_HANDLE (XEN_SCHED_SHUTDOWN);
+
+/*
+ * Reason codes for SCHEDOP_shutdown. These may be interpreted by control
+ * software to determine the appropriate action. For the most part, Xen does
+ * not care about the shutdown code.
+ */
+/* ` enum sched_shutdown_reason { */
+#define XEN_SHED_SHUTDOWN_POWEROFF  0  /* Domain exited normally. Clean up and kill. */
+#define XEN_SHED_SHUTDOWN_REBOOT    1  /* Clean up, kill, and then restart.          */
+#define XEN_SHED_SHUTDOWN_SUSPEND   2  /* Clean up, save suspend info, kill.         */
+#define XEN_SHED_SHUTDOWN_CRASH     3  /* Tell controller we've crashed.             */
+#define XEN_SHED_SHUTDOWN_WATCHDOG  4  /* Restart because watchdog time expired.     */
+
+#endif /* __XEN_PUBLIC_SCHED_H__ */
diff --git a/OvmfPkg/Include/Library/XenHypercallLib.h b/OvmfPkg/Include/Library/XenHypercallLib.h
index 28eee8ccac85..d7cf2c0c505b 100644
--- a/OvmfPkg/Include/Library/XenHypercallLib.h
+++ b/OvmfPkg/Include/Library/XenHypercallLib.h
@@ -101,4 +101,11 @@ XenHypercallEventChannelOp (
   IN OUT VOID  *Arguments
   );
 
+INTN
+EFIAPI
+XenHypercallSchedOp (
+  IN     INTN  Operation,
+  IN OUT VOID  *Arguments
+  );
+
 #endif
diff --git a/OvmfPkg/Library/XenHypercallLib/XenHypercall.c b/OvmfPkg/Library/XenHypercallLib/XenHypercall.c
index 65b14a11f402..b1a129998fdc 100644
--- a/OvmfPkg/Library/XenHypercallLib/XenHypercall.c
+++ b/OvmfPkg/Library/XenHypercallLib/XenHypercall.c
@@ -87,3 +87,17 @@ XenHypercallEventChannelOp (
            (INTN)Arguments
            );
 }
+
+INTN
+EFIAPI
+XenHypercallSchedOp (
+  IN     INTN  Operation,
+  IN OUT VOID  *Arguments
+  )
+{
+  return XenHypercall2 (
+           __HYPERVISOR_sched_op,
+           Operation,
+           (INTN)Arguments
+           );
+}
-- 
Anthony PERARD



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