lguest: suppress PS/2 keyboard polling.

While hacking on getting I/O out to the lguest launcher, I noticed
that returning 0xFF for the PS/2 keyboard status made it spin for a
while thinking there was a key pending.  Fix this by returning 1
instead of 0xFF.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 4 insertions, 0 deletions

diff --git a/tools/lguest/lguest.c b/tools/lguest/lguest.c
index b2217657f62c..485fe13db12e 100644
--- a/tools/lguest/lguest.c
+++ b/tools/lguest/lguest.c
@@ -1259,6 +1259,10 @@ static void emulate_insn(const u8 insn[])
         else
                 mask = 0xFFFFFFFF;
 
+        /* This is the PS/2 keyboard status; 1 means ready for output */
+        if (port == 0x64)
+                val = 1;
+
         /*
          * If it was an "IN" instruction, they expect the result to be read
          * into %eax, so we change %eax.