On Mon, May 09, 2016 at 04:22:33PM +0200, Paolo Bonzini wrote: > On 06/05/2016 15:36, James Hogan wrote: > > - It is actually redundant, since the host ASID will be restored > > correctly by kvm_arch_vcpu_put(), which is called almost immediately > > after kvm_arch_vcpu_ioctl_run() returns. > > What happens if the guest does a rogue access to the area where the host > kernel resides? Would that cause a wrong entry in the TLB? The kernel and lowmem reside in KSEG0/XKPYS which are "unmapped segments". Unmapped means, the TLB isn't accessed at all nor does the ASID matter in the address translation process in one of these unmapped segments. Ralf
