[PATCH 0/5] Fix some mmu/emulator atomicity issues (v2)

[Avi Kivity <avi@redhat.com>]

Currently when we emulate a locked operation into a shadowed guest page
table, we perform a write rather than a true atomic.  This is indicated
by the "emulating exchange as write" message that shows up in dmesg.

In addition, the pte prefetch operation during invlpg suffered from a
race.  This was fixed by removing the operation.

This patchset fixes both issues and reinstates pte prefetch on invlpg.

v2:
   - fix truncated description for patch 1
   - add new patch 4, which fixes a bug in patch 5

Avi Kivity (5):
  KVM: MMU: Consolidate two guest pte reads in kvm_mmu_pte_write()
  KVM: Make locked operations truly atomic
  KVM: Don't follow an atomic operation by a non-atomic one
  KVM: MMU: Do not instantiate nontrapping spte on unsync page
  KVM: MMU: Reinstate pte prefetch on invlpg

 arch/x86/include/asm/kvm_host.h |    1 +
 arch/x86/kvm/mmu.c              |   78 +++++++++++++++---------------
 arch/x86/kvm/paging_tmpl.h      |   25 +++++++++-
 arch/x86/kvm/x86.c              |  101 ++++++++++++++++++++++++++++-----------
 4 files changed, 137 insertions(+), 68 deletions(-)