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KVM: PIT: control word is write-only 

PIT control word (address 0x43) is write-only, reads are undefined.

Cc: stable@kernel.org
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Marcelo Tosatti 2010-01-29 17:28:41 -02:00 committed by Avi Kivity
parent 923de3cf5b
commit ee73f656a6
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/i8254.c
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@ -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);