[PATCH 0/3] KVM: MMU: fix kvm_is_mmio_pfn()

[Haozhong Zhang]

[I just copy the commit message from patch 3]

By default, KVM treats a reserved page as for MMIO purpose, and maps
it to guest with UC memory type.  However, some reserved pages are not
for MMIO, such as pages of DAX device (e.g., /dev/daxX.Y). Mapping
them with UC memory type will harm the performance.  In order to
exclude those cases, we check the host cache mode in addition and only
treat UC/UC- pages as MMIO.

Haozhong Zhang (3):
  x86/mm: expose track_pfn_insert()
  KVM: add converters between pfn_t and kvm_pfn_t
  KVM: MMU: consider host cache type in MMIO pfn check

 arch/x86/kvm/mmu.c       | 32 +++++++++++++++++++++++++++++---
 arch/x86/mm/pat.c        |  1 +
 include/linux/kvm_host.h |  3 +++
 3 files changed, 33 insertions(+), 3 deletions(-)

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2.14.1