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KVM: PIT: control word is write-only
author
Marcelo Tosatti
<mtosatti@redhat.com>
Fri, 29 Jan 2010 19:28:41 +0000
(17:28 -0200)
committer
Avi Kivity
<avi@redhat.com>
Tue, 9 Feb 2010 17:20:15 +0000
(19:20 +0200)
PIT control word (address 0x43) is write-only, reads are undefined.
Cc: stable@kernel.org
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
arch/x86/kvm/i8254.c
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diff --git
a/arch/x86/kvm/i8254.c
b/arch/x86/kvm/i8254.c
index
296aba4
..
15578f1
100644
(file)
--- a/
arch/x86/kvm/i8254.c
+++ b/
arch/x86/kvm/i8254.c
@@
-467,6
+467,9
@@
static int pit_ioport_read(struct kvm_io_device *this,
return -EOPNOTSUPP;
addr &= KVM_PIT_CHANNEL_MASK;
+ if (addr == 3)
+ return 0;
+
s = &pit_state->channels[addr];
mutex_lock(&pit_state->lock);