On Mon, Sep 09, 2013 at 12:53:02PM +0200, Paolo Bonzini wrote: > Il 09/09/2013 12:22, SPA ha scritto: > > Thanks Paolo. > > > > Is there a way where reads would trap ? > > > > I explored a bit on PM_PRESENT_MASK. Though its not READ bit, but a > > PRESENT bit, it looks like it should generate traps on reads if this > > bit is reset. From code, looks like rmap_write_protect() like function > > I stated in previous mail should do. Would this approach work ? Are > > there any glaring problems with this approach ? > > I cannot say right away. Another way could be to set reserved bits to > generate EPT misconfigurations. See ept_set_mmio_spte_mask and > is_mmio_spte. > > This would trap both reads and writes. > Dropping all sptes will also work, but trapping each read access will be dog slow. QEMU emulation will be much faster. -- Gleb. -- 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
