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kvm__emulate_io: Don't fall through from IO in to IO out if no handler

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If an IO port device has no io_in handler, kvm__emulate_io would fall
through and call the io_out handler instead.  Fix to only call the
handler for the appropriate direction.

If no handler exists, kvm__emulate_io will automatically treat it as an
IO error (due to the default "ret = false").

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Josh Triplett
2015-08-06 19:39:59 +01:00
committed by Will Deacon
parent e7b95bd430
commit 2ec1740506
1 changed files with 1 additions and 1 deletions
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ioport.c
+1 -1
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@@ -192,7 +192,7 @@ bool kvm__emulate_io(struct kvm_cpu *vcpu, u16 port, void *data, int direction,
while (count--) {
if (direction == KVM_EXIT_IO_IN && ops->io_in)
ret = ops->io_in(entry, vcpu, port, ptr, size);
else if (ops->io_out)
else if (direction == KVM_EXIT_IO_OUT && ops->io_out)
ret = ops->io_out(entry, vcpu, port, ptr, size);
ptr += size;