[Qemu-devel] [PATCH 0/2] Add Windows support for time resync by qemu-ga

[Qemu-devel] [PATCH 0/2] Add Windows support for time resync by qemu-ga

[Lei Li]

This patch series attempts to add Windows implementation
for qemu-ga commands guest-get-time and guest-set-time.

The previous thread about the interfaces introduced and 
the POSIX-specific command implementation has already
been accepted, the reference link:

http://article.gmane.org/gmane.comp.emulators.qemu/198472

Notes:
For now, It was just tested on Windows XP SP3. I will test
it on Windows 7 later. As I am new to windows development,
so there may be a lot of flaws. Please let me know your
suggestions, and comments are very welcome!

Thanks.


Lei Lii (2):
    qga: add windows implementation for guest-get-time
    qga: add windows implementation for guest-set-time

[Qemu-devel] [PATCH 3/4] qga: add windows implementation for guest-get-time

[Lei Li]

Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
---
 qga/commands-win32.c |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 7e8ecb3..4febec7 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -22,6 +22,8 @@
 #define SHTDN_REASON_FLAG_PLANNED 0x80000000
 #endif
 
+#define _W32_FT_OFFSET (116444736000000000ULL)
+
 static void acquire_privilege(const char *name, Error **err)
 {
     HANDLE token;
@@ -108,6 +110,32 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)
     }
 }
 
+int64_t qmp_guest_get_time(Error **errp)
+{
+   SYSTEMTIME *ts = g_malloc0(sizeof(SYSTEMTIME));
+   int64_t time_ns;
+   union {
+       UINT64 ns100;
+       FILETIME tf;
+   } time;
+
+   GetSystemTime(ts);
+   if (!ts) {
+       slog("guest-get-time failed: %d", GetLastError());
+       error_setg_errno(errp, errno, "Failed to get time");
+       return -1;
+   }
+
+   if (!SystemTimeToFileTime(ts, &time.tf)) {
+       error_setg_errno(errp, errno, "Failed to convert system time");
+       return -1;
+   }
+
+   time_ns = (int64_t)((time.ns100 - _W32_FT_OFFSET) * 100);
+
+   return time_ns;
+}
+
 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, Error **err)
 {
     error_set(err, QERR_UNSUPPORTED);
-- 
1.7.7.6

Re: [Qemu-devel] [PATCH 3/4] qga: add windows implementation for guest-get-time

[Lei Li]

Ops, wrong patch set... will resend it. Sorry for the missending.  :-(

On 03/06/2013 08:57 PM, Lei Li wrote:
> Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
> ---
>   qga/commands-win32.c |   28 ++++++++++++++++++++++++++++
>   1 files changed, 28 insertions(+), 0 deletions(-)
>
> diff --git a/qga/commands-win32.c b/qga/commands-win32.c
> index 7e8ecb3..4febec7 100644
> --- a/qga/commands-win32.c
> +++ b/qga/commands-win32.c
> @@ -22,6 +22,8 @@
>   #define SHTDN_REASON_FLAG_PLANNED 0x80000000
>   #endif
>
> +#define _W32_FT_OFFSET (116444736000000000ULL)
> +
>   static void acquire_privilege(const char *name, Error **err)
>   {
>       HANDLE token;
> @@ -108,6 +110,32 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)
>       }
>   }
>
> +int64_t qmp_guest_get_time(Error **errp)
> +{
> +   SYSTEMTIME *ts = g_malloc0(sizeof(SYSTEMTIME));
> +   int64_t time_ns;
> +   union {
> +       UINT64 ns100;
> +       FILETIME tf;
> +   } time;
> +
> +   GetSystemTime(ts);
> +   if (!ts) {
> +       slog("guest-get-time failed: %d", GetLastError());
> +       error_setg_errno(errp, errno, "Failed to get time");
> +       return -1;
> +   }
> +
> +   if (!SystemTimeToFileTime(ts, &time.tf)) {
> +       error_setg_errno(errp, errno, "Failed to convert system time");
> +       return -1;
> +   }
> +
> +   time_ns = (int64_t)((time.ns100 - _W32_FT_OFFSET) * 100);
> +
> +   return time_ns;
> +}
> +
>   int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, Error **err)
>   {
>       error_set(err, QERR_UNSUPPORTED);


-- 
Lei

[Qemu-devel] [PATCH 4/4] qga: add windows implementation for guest-set-time

[Lei Li]

Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
---
 qga/commands-win32.c |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 4febec7..1a90aa7 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -136,6 +136,41 @@ int64_t qmp_guest_get_time(Error **errp)
    return time_ns;
 }
 
+void qmp_guest_set_time(int64_t time_ns, Error **errp)
+{
+    SYSTEMTIME ts;
+    FILETIME tf;
+    LONGLONG time;
+
+    /* year-2038 will overflow in case time_t is 32bit */
+    if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) {
+        error_setg(errp, "Time %" PRId64 " is too large", time_ns);
+        return;
+    }
+
+    acquire_privilege(SE_SYSTEMTIME_NAME, errp);
+    if (error_is_set(errp)) {
+        error_setg(errp, "Failed to acquire privilege");
+        return;
+    }
+
+    time = time_ns / 100 + _W32_FT_OFFSET;
+
+    tf.dwLowDateTime = (DWORD) time;
+    tf.dwHighDateTime = (DWORD) (time >> 32);
+
+    if (!FileTimeToSystemTime(&tf, &ts)) {
+        error_setg(errp, "Failed to convert system time");
+        return;
+    }
+
+    if (!SetSystemTime(&ts)) {
+        slog("guest-set-time failed: %d", GetLastError());
+        error_setg_errno(errp, errno, "Failed to set time to guest");
+        return;
+    }   
+}
+
 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, Error **err)
 {
     error_set(err, QERR_UNSUPPORTED);
-- 
1.7.7.6