KVM Migration Patch for S2E

kvm-migration.patch

/* linux-lts-saucy-3.11.0/arch/x86/kvm/vmx.c */
static int handle_exception(struct kvm_vcpu *vcpu)
{
        ...
        enum emulation_result er;

        struct x86_emulate_ctxt *ctxt;
        ...

        if (is_invalid_opcode(intr_info)) {
                er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD);

#if 1
                ctxt = &vcpu->arch.emulate_ctxt;
                printk(KERN_WARNING "\nctxt->eip = 0x%lx\nctxt->_eip = 0x%lx\nctxt->fetch.start = 0x%lx\nctxt->fetch.end = 0x%lx\n", ctxt->eip, ctxt->_eip, ctxt->fetch.start, ctxt->fetch.end);
                printk(KERN_WARNING "ctxt->fetch.data[]: 0x%01x 0x%01x\n", ctxt->fetch.data[0], ctxt->fetch.data[1]);
                if ((ctxt->fetch.data[0] == 0x0f) && (ctxt->fetch.data[1] == 0x3f))
                  {
                    printk(KERN_WARNING "S2E instruction seen!\n");

                    /* Initiate live migration */
                    vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
                    vcpu->run->internal.suberror = 5;  /*temporary error code*/
                    vcpu->run->internal.ndata = 1;
                    vcpu->run->internal.data[0] = ctxt->eip;
                    return 0;
                  }
#endif

                if (er != EMULATE_DONE)
                        kvm_queue_exception(vcpu, UD_VECTOR);
                return 1;
        }