On Fri, 18 Apr 2008 08:23:07 -0500
Anthony Liguori <[EMAIL PROTECTED]> wrote:
> This doesn't seem right. You should have been able to break out of the
> emulator long before encountering an out instruction. The next
> instruction you encounter should be a mov instruction. Are you sure
> you're updating eip correctly?
I think that eip is updated correctly but you're right, I think that
the condition to stop emulation is not well implemented. I emulate a
lot of mov instructions and I remain blocked in the emulation loop
until I reach the "out" instruction. The loop is the following:
[...]
cs_rpl = vmcs_read16(GUEST_CS_SELECTOR) & SELECTOR_RPL_MASK;
ss_rpl = vmcs_read16(GUEST_SS_SELECTOR) & SELECTOR_RPL_MASK;
while (cs_rpl != ss_rpl) {
if (emulate_instruction(vcpu, NULL, 0,0, 0) == EMULATE_FAIL) {
printk(KERN_INFO "%s: emulation of 0x%x failed\n",
__FUNCTION__,
vcpu->arch.emulate_ctxt.decode.b);
return -1;
}
cs_rpl = vmcs_read16(GUEST_CS_SELECTOR) & SELECTOR_RPL_MASK;
ss_rpl = vmcs_read16(GUEST_SS_SELECTOR) & SELECTOR_RPL_MASK;
}
printk(KERN_INFO "%s: VMX friendly state recovered\n", __FUNCTION__);
// I never reach this point
Maybe CS and SS selector are not well updated. I will add trace to see
their values before and after the emulation.
Regards,
Guillaume
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