From: Gleb Natapov <gleb@redhat.com>
Date: Thu, 18 Mar 2010 13:20:23 +0000 (+0200)
Subject: KVM: x86 emulator: fix in/out emulation.
X-Git-Tag: v2.6.35-rc1~436^2~151
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cf8f70bfe38b326bb80b10f76d6544f571040229;p=pandora-kernel.git

KVM: x86 emulator: fix in/out emulation.

in/out emulation is broken now. The breakage is different depending
on where IO device resides. If it is in userspace emulator reports
emulation failure since it incorrectly interprets kvm_emulate_pio()
return value. If IO device is in the kernel emulation of 'in' will do
nothing since kvm_emulate_pio() stores result directly into vcpu
registers, so emulator will overwrite result of emulation during
commit of shadowed register.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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