[PATCH v2 0/3] arm64: KVM: High memory guest fixes

Marc Zyngier marc.zyngier at arm.com
Tue Mar 10 12:06:58 PDT 2015

I've been playing with a hacked-up kvmtool that places the memory much
higher than usual, in an effort to emulate what some arm64 platforms
do (typically AMD Seattle).

Unexpectedly (hey, what could possibly go wrong...), I've discovered a
couple of mm related issues, ranging from the host exploding to the
guest being stuck on a page fault. Additionally, I noticed a minor
documentation issue.

With these fixes in, I'm able to run a guest that has its memory
located just under the 40bit limit.

* From v1 [1]:
- Reworked patch #1 to use split_page() instead. This leads to much
  refactoring, but is slightly nicer (more common code).
- Dropped Mark's Tested-by (too many changes)

[1]: https://lists.cs.columbia.edu/pipermail/kvmarm/2015-February/013672.html

Marc Zyngier (3):
  arm64: KVM: Fix stage-2 PGD allocation to have per-page refcounting
  arm64: KVM: Do not use pgd_index to index stage-2 pgd
  arm64: KVM: Fix outdated comment about VTCR_EL2.PS

 arch/arm/include/asm/kvm_mmu.h   | 12 ++----
 arch/arm/kvm/mmu.c               | 85 ++++++++++++++++++++++++++++++----------
 arch/arm64/include/asm/kvm_arm.h |  5 ++-
 arch/arm64/include/asm/kvm_mmu.h | 48 +++--------------------
 4 files changed, 77 insertions(+), 73 deletions(-)


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