Paolo Bonzini <pbonzini <at> redhat.com> writes: > On 15/12/2015 18:02, Hebbal Yacine wrote: > > What I want to do is: when a controlled process is in user mode, i > > change its cpl to 0, force it to execute a code that is injected in the > > VM, set back its cpl to 3 and let it run like if nothing happened > > Could you inject an SMI and place your code in the guest firmware's SMM > handler? What input is needed by this CPL=0 code? > > Paolo I think the the solution follows this logic, meaning we inject an interrupt, intercept execution of its handler (cpl is 0), save cpu context, execute the code we want, push a return address, and force the process to execute IRET instruction which will complete the cleaning, restore cpl to 3 and let the process resume its normal execution. I'll continue to dig this to see if there is any better approach, thanks for your help :) Yacine -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
