[Qemu-devel] [PATCH 4/7] qemu-ga: add win32 guest-suspend-disk command.

[Michael Roth <mdroth@linux.vnet.ibm.com>]

From: Gal Hammer <ghammer@redhat.com>

Implement guest-suspend-disk RPC for Windows. Functionally this should be
equivalent to the posix implementation.

Signed-off-by: Gal Hammer <ghammer@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 configure            |    2 +-
 qga/commands-win32.c |  132 +++++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 121 insertions(+), 13 deletions(-)

diff --git a/configure b/configure
index 39d2b54..709e4b9 100755
--- a/configure
+++ b/configure
@@ -525,7 +525,7 @@ EOF
   bindir="\${prefix}"
   sysconfdir="\${prefix}"
   confsuffix=""
-  libs_qga="-lws2_32 -lwinmm $lib_qga"
+  libs_qga="-lws2_32 -lwinmm -lpowrprof $lib_qga"
 fi
 
 werror=""
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 7ef185f..062e519 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -5,12 +5,15 @@
  *
  * Authors:
  *  Michael Roth      <mdroth@linux.vnet.ibm.com>
+ *  Gal Hammer        <ghammer@redhat.com>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */
 
 #include <glib.h>
+#include <wtypes.h>
+#include <powrprof.h>
 #include "qga/guest-agent-core.h"
 #include "qga-qmp-commands.h"
 #include "qerror.h"
@@ -19,10 +22,63 @@
 #define SHTDN_REASON_FLAG_PLANNED 0x80000000
 #endif
 
-void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)
+static void acquire_privilege(const char *name, Error **err)
 {
     HANDLE token;
     TOKEN_PRIVILEGES priv;
+    Error *local_err = NULL;
+
+    if (error_is_set(err)) {
+        return;
+    }
+
+    if (OpenProcessToken(GetCurrentProcess(),
+        TOKEN_ADJUST_PRIVILEGES|TOKEN_QUERY, &token))
+    {
+        if (!LookupPrivilegeValue(NULL, name, &priv.Privileges[0].Luid)) {
+            error_set(&local_err, QERR_QGA_COMMAND_FAILED,
+                      "no luid for requested privilege");
+            goto out;
+        }
+
+        priv.PrivilegeCount = 1;
+        priv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
+
+        if (!AdjustTokenPrivileges(token, FALSE, &priv, 0, NULL, 0)) {
+            error_set(&local_err, QERR_QGA_COMMAND_FAILED,
+                      "unable to acquire requested privilege");
+            goto out;
+        }
+
+        CloseHandle(token);
+    } else {
+        error_set(&local_err, QERR_QGA_COMMAND_FAILED,
+                  "failed to open privilege token");
+    }
+
+out:
+    if (local_err) {
+        error_propagate(err, local_err);
+    }
+}
+
+static void execute_async(DWORD WINAPI (*func)(LPVOID), LPVOID opaque, Error **err)
+{
+    Error *local_err = NULL;
+
+    if (error_is_set(err)) {
+        return;
+    }
+    HANDLE thread = CreateThread(NULL, 0, func, opaque, 0, NULL);
+    if (!thread) {
+        error_set(&local_err, QERR_QGA_COMMAND_FAILED,
+                  "failed to dispatch asynchronous command");
+        error_propagate(err, local_err);
+    }
+}
+
+void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)
+{
     UINT shutdown_flag = EWX_FORCE;
 
     slog("guest-shutdown called, mode: %s", mode);
@@ -41,16 +97,9 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)
 
     /* Request a shutdown privilege, but try to shut down the system
        anyway. */
-    if (OpenProcessToken(GetCurrentProcess(),
-        TOKEN_ADJUST_PRIVILEGES|TOKEN_QUERY, &token))
-    {
-        LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME,
-            &priv.Privileges[0].Luid);
-
-        priv.PrivilegeCount = 1;
-        priv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
-
-        AdjustTokenPrivileges(token, FALSE, &priv, 0, NULL, 0);
+    acquire_privilege(SE_SHUTDOWN_NAME, err);
+    if (error_is_set(err)) {
+        return;
     }
 
     if (!ExitWindowsEx(shutdown_flag, SHTDN_REASON_FLAG_PLANNED)) {
@@ -124,9 +173,68 @@ int64_t qmp_guest_fsfreeze_thaw(Error **err)
     return 0;
 }
 
+typedef enum {
+    GUEST_SUSPEND_MODE_DISK
+} GuestSuspendMode;
+
+static void check_suspend_mode(GuestSuspendMode mode, Error **err)
+{
+    SYSTEM_POWER_CAPABILITIES sys_pwr_caps;
+    Error *local_err = NULL;
+
+    if (error_is_set(err)) {
+        return;
+    }
+    ZeroMemory(&sys_pwr_caps, sizeof(sys_pwr_caps));
+    if (!GetPwrCapabilities(&sys_pwr_caps)) {
+        error_set(&local_err, QERR_QGA_COMMAND_FAILED,
+                  "failed to determine guest suspend capabilities");
+        goto out;
+    }
+
+    if (mode == GUEST_SUSPEND_MODE_DISK) {
+        if (sys_pwr_caps.SystemS4) {
+            return;
+        }
+    } else {
+        error_set(&local_err, QERR_INVALID_PARAMETER_VALUE, "mode",
+                  "GuestSuspendMode");
+        goto out;
+    }
+
+    error_set(&local_err, QERR_QGA_COMMAND_FAILED,
+              "suspend mode not supported by OS");
+out:
+    if (local_err) {
+        error_propagate(err, local_err);
+    }
+}
+
+static DWORD WINAPI do_suspend(LPVOID opaque)
+{
+    GuestSuspendMode *mode = opaque;
+    DWORD ret = 0;
+
+    if (!SetSuspendState(*mode == GUEST_SUSPEND_MODE_DISK, TRUE, TRUE)) {
+        slog("failed to suspend guest, %s", GetLastError());
+        ret = -1;
+    }
+    g_free(mode);
+    return ret;
+}
+
 void qmp_guest_suspend_disk(Error **err)
 {
-    error_set(err, QERR_UNSUPPORTED);
+    GuestSuspendMode *mode = g_malloc(sizeof(GuestSuspendMode));
+
+    *mode = GUEST_SUSPEND_MODE_DISK;
+    check_suspend_mode(*mode, err);
+    acquire_privilege(SE_SHUTDOWN_NAME, err);
+    execute_async(do_suspend, mode, err);
+
+    if (error_is_set(err)) {
+        g_free(mode);
+    }
 }
 
 void qmp_guest_suspend_ram(Error **err)
-- 
1.7.4.1