On 03/12/2014 11:12, Zhang Haoyu wrote: >> > EXIT_REASON_EPT_VIOLATION is similar to a "page not present" pagefault >> > EXIT_REASON_EPT_MISCONFIG is similar to a "reserved bit set" pagefault. >> > handle_ept_misconfig() handles mmio pagefault because KVM has an >> > optimization that uses reserved bits to mark mmio regions. >> > > Thanks, Gleb, > where does kvm use the reserved bits to mark mmio regions? ept_set_mmio_spte_mask is where KVM tells mmu.c how to mark MMIO regions. You can search mmu.c for shadow_mmio_mask and is_mmio_spte in order to find out more about this optimization, you'll also get to the mark_mmio_spte function that Gleb mentioned. Paolo -- 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
