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[PATCH v2 for-4.19 0/3] x86/EPT: avoid undue forcing of MMIO accesses to UC


  • To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Wed, 12 Jun 2024 15:15:12 +0200
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
  • Delivery-date: Wed, 12 Jun 2024 13:15:25 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

..., getting in the way of, in particular, PVH Dom0 accessing its video
frame buffer (if it has a console).

While especially the 1st one may not appear to be so, both of the earlier
patches are strictly prereqs to the last one.

1: correct special page checking in epte_get_entry_emt()
2: avoid marking non-present entries for re-configuring
3: drop questionable mfn_valid() from epte_get_entry_emt()

Jan



 


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