On Wed, Jul 28, 2010 at 07:57:36AM -0400, Avi Kivity wrote: > If the instruction opcode is on mmio, the processor never sees the > opcode and thus can not intercept. Or the processor may see one > instruction, which is not intercepted, but by the time the emulator > kicks in a different instruction takes its place, since another vcpu is > evilly cross-modifying the code. Right. X-modifying code is a problem too. > The guest (L2 in this case) is doomed since it execution cannot > continue. But L1 and L0 are fine. The problem with L2 avoiding > intercepts is that L2 can change control registers and take over L1. Right too. We can not ignore it. The right fix is probably a check for the instruction intercepts right after the decoder has run and before the emulator ran. Joer -- Joerg Roedel - AMD Operating System Research Center Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach General Managers: Alberto Bozzo, Andrew Bowd Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632 -- 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
