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KVM: x86 emulator: fix xchg instruction emulation
authorWei Yongjun <yjwei@cn.fujitsu.com>
Thu, 15 Jul 2010 00:51:58 +0000 (08:51 +0800)
committerAvi Kivity <avi@redhat.com>
Mon, 2 Aug 2010 03:40:53 +0000 (06:40 +0300)
If the destination is a memory operand and the memory cannot
map to a valid page, the xchg instruction emulation and locked
instruction will not work on io regions and stuck in endless
loop. We should emulate exchange as write to fix it.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Acked-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

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