* KVM: PIT: control word is write-only
@ 2010-01-29 19:28 Marcelo Tosatti
2010-02-01 8:21 ` Jason Wang
0 siblings, 1 reply; 2+ messages in thread
From: Marcelo Tosatti @ 2010-01-29 19:28 UTC (permalink / raw)
To: kvm; +Cc: Jason Wang
PIT control word (address 0x43) is write-only, reads are undefined.
Cc: stable@kernel.org
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index caad189..6a74246 100644
--- 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);
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2010-01-29 19:28 KVM: PIT: control word is write-only Marcelo Tosatti
2010-02-01 8:21 ` Jason Wang
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