linux-kernel - [PATCH 07/29] lguest: suppress PS/2 keyboard polling.

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Date:	Fri,  6 Feb 2015 15:51:50 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"lkml" <linux-kernel@...r.kernel.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>
Subject: [PATCH 07/29] 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@...tcorp.com.au>
---
 tools/lguest/lguest.c | 4 ++++
 1 file changed, 4 insertions(+)

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.
-- 
2.1.0

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