[Xen-devel] [PATCH] fix kbd issue on 2.6 kernel in vmx guest.

["Ling, Xiaofeng" <xiaofeng.ling@xxxxxxxxx>]

This patch fixed keyboard issue for linux kernel 2.6 in vmx guest.
linux 2.6 kernel keyboard use a timer to poll the kbd state,in
virtualization environment,the kbd interrupt injection is very likely
to happend just after kbd state query in the kbd timer and thus
will reverse sequence of scan code.
Also fix env->send_event SMP issue.

Signed-off-by: Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx>
Signed-off-by: Edwin Zhai<edwin.zhai@xxxxxxxxx>
Signed-off-by: Eddion Dong <eddie.dong@xxxxxxxxx>
Signed-off-by: Asit Mallick <asit.k.mallick@xxxxxxxxx>

diff -r 090e44133d40 tools/ioemu/target-i386-dm/helper2.c
--- a/tools/ioemu/target-i386-dm/helper2.c      Mon Nov 14 18:13:38 2005 +0100
+++ b/tools/ioemu/target-i386-dm/helper2.c      Tue Nov 15 12:53:12 2005 +0800
@@ -416,6 +416,7 @@
        FD_ZERO(&wakeup_rfds);
        FD_SET(evtchn_fd, &wakeup_rfds);
        highest_fds = evtchn_fd;
+       env->send_event = 0
        while (1) {
                 if (vm_running) {
                     if (shutdown_requested) {
@@ -431,7 +432,6 @@
                tv.tv_sec = 0;
                tv.tv_usec = 100000;

-               env->send_event = 0;
                retval = select(highest_fds+1, &wakeup_rfds, NULL, NULL, &tv);
                if (retval == -1) {
                        perror("select");
@@ -447,12 +447,13 @@
 #define ULONGLONG_MAX   ULONG_MAX
 #endif

-               main_loop_wait(0);
         tun_receive_handler(&rfds);
         if ( FD_ISSET(evtchn_fd, &rfds) ) {
             cpu_handle_ioreq(env);
         }
+               main_loop_wait(0);
                if (env->send_event) {
+                   env->send_event = 0;
                        struct ioctl_evtchn_notify notify;
                        notify.port = ioreq_local_port;
                        (void)ioctl(evtchn_fd, IOCTL_EVTCHN_NOTIFY, &notify);

# HG changeset patch
# User Xiaofeng Ling<xiaofeng.ling@xxxxxxxxx>
# Node ID 23df47d825f17e22f7af0deea53d9423d1717731
# Parent  090e44133d40247bc3ccbb565b644d02fdac6829
This patch fixed keyboard issue for linux kernel 2.6 in vmx guest.
linux 2.6 kernel keyboard use a timer to poll the kbd state,in
virtualization environment,the kbd interrupt injection is very likely
to happend just after kbd state query in the kbd timer and thus 
will reverse sequence of scan code.
Also fix env->send_event SMP issue.

Signed-off-by: Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx>
Signed-off-by: Edwin Zhai<edwin.zhai@xxxxxxxxx>
Signed-off-by: Eddion Dong <eddie.dong@xxxxxxxxx>
Signed-off-by: Asit Mallick <asit.k.mallick@xxxxxxxxx>

diff -r 090e44133d40 tools/ioemu/target-i386-dm/helper2.c
--- a/tools/ioemu/target-i386-dm/helper2.c      Mon Nov 14 18:13:38 2005 +0100
+++ b/tools/ioemu/target-i386-dm/helper2.c      Tue Nov 15 12:53:12 2005 +0800
@@ -416,6 +416,7 @@
        FD_ZERO(&wakeup_rfds);
        FD_SET(evtchn_fd, &wakeup_rfds);
        highest_fds = evtchn_fd;
+       env->send_event = 0
        while (1) {
                 if (vm_running) {
                     if (shutdown_requested) {
@@ -431,7 +432,6 @@
                tv.tv_sec = 0;
                tv.tv_usec = 100000;
 
-               env->send_event = 0;
                retval = select(highest_fds+1, &wakeup_rfds, NULL, NULL, &tv);
                if (retval == -1) {
                        perror("select");
@@ -447,12 +447,13 @@
 #define ULONGLONG_MAX   ULONG_MAX
 #endif
 
-               main_loop_wait(0);
         tun_receive_handler(&rfds);
         if ( FD_ISSET(evtchn_fd, &rfds) ) {
             cpu_handle_ioreq(env);
         }
+               main_loop_wait(0);
                if (env->send_event) {
+                   env->send_event = 0;
                        struct ioctl_evtchn_notify notify;
                        notify.port = ioreq_local_port;
                        (void)ioctl(evtchn_fd, IOCTL_EVTCHN_NOTIFY, &notify);

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