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KVM: x86 emulator: fix in/out emulation.

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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>
This commit is contained in:
Gleb Natapov
2010-03-18 15:20:23 +02:00
committed by Avi Kivity
parent d9271123a4
commit cf8f70bfe3
6 changed files with 181 additions and 136 deletions
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3
arch/x86/include/asm/kvm_host.h
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@ -590,8 +590,7 @@ int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
struct x86_emulate_ctxt;
int kvm_emulate_pio(struct kvm_vcpu *vcpu, int in,
int size, unsigned port);
int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port);
int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, int in,
int size, unsigned long count, int down,
gva_t address, int rep, unsigned port);