On 03/14/2010 06:21 PM, Gleb Natapov wrote:
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.
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 8f5e4c8..344e17b 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -210,13 +210,13 @@ static u32 opcode_table[256] = {
0, 0, 0, 0, 0, 0, 0, 0,
/* 0xE0 - 0xE7 */
0, 0, 0, 0,
- ByteOp | SrcImmUByte, SrcImmUByte,
- ByteOp | SrcImmUByte, SrcImmUByte,
+ ByteOp | SrcImmUByte | DstAcc, SrcImmUByte | DstAcc,
+ ByteOp | SrcImmUByte | DstAcc, SrcImmUByte | DstAcc,
REX prefix shouldn't expand DstAcc to 64 bits here. Might cause
problems further down in the pipeline.+
port = io_info>> 16;
size = (io_info& SVM_IOIO_SIZE_MASK)>> SVM_IOIO_SIZE_SHIFT;
+ svm->next_rip = svm->vmcb->control.exit_info_2;
+ skip_emulated_instruction(&svm->vcpu);
whitespace damage.
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3c5ffa2..37c6178 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3351,6 +3351,86 @@ emul_write:
return emulator_write_emulated(addr, new, bytes, vcpu);
}
+static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
+{
+ /* TODO: String I/O for in kernel device */
ISTR this is actually needed for something. Is this a regression?
--
error compiling committee.c: too many arguments to function
--
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