Messages in this thread | | | Subject | Re: [RFC PATCH 03/13] kvm: Add XO memslot type | From | Paolo Bonzini <> | Date | Fri, 4 Oct 2019 09:27:09 +0200 |
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On 03/10/19 23:23, Rick Edgecombe wrote: > Add XO memslot type to create execute-only guest physical memory based on > the RO memslot. Like the RO memslot, disallow changing the memslot type > to/from XO. > > In the EPT case ACC_USER_MASK represents the readable bit, so add the > ability for set_spte() to unset this. > > This is based in part on a patch by Yu Zhang. > > Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com> > Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Instead of this, why not check the exit qualification gpa and, if it has the XO bit set, mask away both the XO bit and the R bit? It can be done unconditionally for all memslots. This should require no change to userspace.
Paolo
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