QEMU developers:
I have been using QEMU off and on for some time. Recently I had a need
for a Windows XP VM to be joined to a domain. I discovered a rather
annoying issue in the form of the key-grab: NT-based Microsoft
operating systems make heavy use of Ctrl-Alt-Delete, i.e. to sign on,
open the task manager, change your password, lock your screen, etc.
I've started using the tablet USB device specifically because I don't
like this grabby behaviour, and it started becoming a real problem for
everyday use.
I wrote a patch that adds a command-line switch to qemu (-alt-grab).
It allows you to remap the keygrab combination to Ctrl-Alt-Shift when
using SDL-based displays. It has only been tested on Linux / AMD64.
Please reply to me off-list, as I am not subscribed. Comments are
appreciated, and I would like to see this make it into the mainline
QEMU branch.
---------------------------------------------------------------------
Patches below are against kvm-26.
The included patches were written by Michael Mohr.
They are licensed to you under the GNU GPL version 2
or (at your discretion) any later version.
Michael Mohr can be contacted at [EMAIL PROTECTED]
June 06, 2007
diff -urN qemu-org/sdl.c qemu/sdl.c
--- qemu-org/sdl.c 2007-06-06 23:58:13.000000000 -0700
+++ qemu/sdl.c 2007-06-06 23:57:41.000000000 -0700
@@ -223,7 +223,11 @@
strcat(buf, " [Stopped]");
}
if (gui_grab) {
- strcat(buf, " - Press Ctrl-Alt to exit grab");
+ if (!alt_grab) {
+ strcat(buf, " - Press Ctrl-Alt to exit grab");
+ } else {
+ strcat(buf, " - Press Ctrl-Alt-Shift to exit grab");
+ }
}
SDL_WM_SetCaption(buf, "QEMU");
}
@@ -331,8 +335,13 @@
case SDL_KEYDOWN:
case SDL_KEYUP:
if (ev->type == SDL_KEYDOWN) {
- mod_state = (SDL_GetModState() & gui_grab_code) ==
+ if (!alt_grab) {
+ mod_state = (SDL_GetModState() & gui_grab_code) ==
gui_grab_code;
+ } else {
+ mod_state = (SDL_GetModState() & (gui_grab_code |
KMOD_LSHIFT)) ==
+ (gui_grab_code | KMOD_LSHIFT);
+ }
gui_key_modifier_pressed = mod_state;
if (gui_key_modifier_pressed) {
int keycode;
@@ -392,7 +401,11 @@
}
}
} else if (ev->type == SDL_KEYUP) {
- mod_state = (ev->key.keysym.mod & gui_grab_code);
+ if (!alt_grab) {
+ mod_state = (ev->key.keysym.mod & gui_grab_code);
+ } else {
+ mod_state = (ev->key.keysym.mod & (gui_grab_code |
KMOD_LSHIFT));
+ }
if (!mod_state) {
if (gui_key_modifier_pressed) {
gui_key_modifier_pressed = 0;
diff -urN qemu-org/vl.c qemu/vl.c
--- qemu-org/vl.c 2007-06-06 23:58:13.000000000 -0700
+++ qemu/vl.c 2007-06-06 23:57:41.000000000 -0700
@@ -182,6 +182,7 @@
int autostart = 1;
int time_drift_fix = 0;
const char *cpu_vendor_string;
+int alt_grab = 0;
/***********************************************************/
/* x86 ISA bus support */
@@ -6341,6 +6342,7 @@
"-boot [a|c|d|n] boot on floppy (a), hard disk (c), CD-ROM
(d), or network (n)\n" "-snapshot write to temporary files
instead of disk image files\n" #ifdef CONFIG_SDL
+ "-alt-grab use Ctrl-Alt-Shift to grab mouse (instead
of Ctrl-Alt)\n" "-no-quit disable SDL window close capability\n"
#endif
#ifdef TARGET_I386
@@ -6541,6 +6543,7 @@
QEMU_OPTION_no_rtc,
#endif
QEMU_OPTION_cpu_vendor,
+ QEMU_OPTION_alt_grab
};
typedef struct QEMUOption {
@@ -6638,6 +6641,7 @@
{ "no-rtc", 0, QEMU_OPTION_no_rtc },
#endif
{ "cpu-vendor", HAS_ARG, QEMU_OPTION_cpu_vendor },
+ { "alt-grab", 0, QEMU_OPTION_alt_grab },
{ NULL },
};
@@ -7364,6 +7368,9 @@
case QEMU_OPTION_cpu_vendor:
cpu_vendor_string = optarg;
break;
+ case QEMU_OPTION_alt_grab:
+ alt_grab = 1;
+ break;
}
}
}
diff -urN qemu-org/vl.h qemu/vl.h
--- qemu-org/vl.h 2007-06-06 23:58:13.000000000 -0700
+++ qemu/vl.h 2007-06-06 23:57:41.000000000 -0700
@@ -159,6 +159,7 @@
extern int kqemu_allowed;
extern int kvm_allowed;
extern int win2k_install_hack;
+extern int alt_grab;
extern int usb_enabled;
extern int smp_cpus;
extern int no_quit;
