[COMMIT master] KVM: PIT: control word is write-only

[Avi Kivity]

From: Marcelo Tosatti mtosa...@redhat.com

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

Cc: sta...@kernel.org
Signed-off-by: Marcelo Tosatti mtosa...@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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Re: KVM: PIT: control word is write-only

[Jason Wang]

Marcelo Tosatti wrote:

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

Cc: sta...@kernel.org
Signed-off-by: Marcelo Tosatti mtosa...@redhat.com
  

Acked-by: Jason Wang jasow...@redhat.com
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