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.
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