[v2,0/2] KVM: Fix refaulting due to page table update

Message

Punit Agrawal Aug. 13, 2018, 9:40 a.m. UTC

Hi,

Here's a couple of patches to fix an issue when multiple vcpus fault
on a page table entry[0]. The issue was reported by a user when testing
PUD hugepage support[1] but also exists for PMD and PTE updates though
with a lower probability.

In this version -

* the fix has been split for PMD hugepage and PTE update
* refactored the PMD fix
* applied fixes tag and cc'ing to stable

Thanks,
Punit

[0] https://lkml.org/lkml/2018/8/10/256
[1] https://lkml.org/lkml/2018/7/16/482

Punit Agrawal (2):
  KVM: arm/arm64: Skip updating PMD entry if no change
  KVM: arm/arm64: Skip updating PTE entry if no change

 virt/kvm/arm/mmu.c | 45 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 34 insertions(+), 11 deletions(-)