mbox series

[v5.8,v2,0/2] KVM: arm64: Fix AT instruction handling

Message ID 20200902092904.122477-1-andre.przywara@arm.com
Headers show
Series KVM: arm64: Fix AT instruction handling | expand

Message

Andre Przywara Sept. 2, 2020, 9:29 a.m. UTC 
Changes from v1:
- (Re-)adding Marc's review tags from upstream. Differences to the
  original patches are trivial for 2/2, and straight-forward for 1/2.
- Fix spelling of vaxorcism
-------------

In some architectural corner cases, AT instructions can generate an
exception, which KVM is not really ready to handle properly.
Teach the code to handle this situation gracefully.

This is a backport of the respective upstream patches to v5.8(.5).
James prepared and tested these already, but we were lacking the upstream
commit ID so far.
I am sending this on his behalf, since he is off this week.

The last two of the originally three patches were tagged Cc: stable
already, but 2/3 did not apply cleanly, hence this specific backport.
3/3 has already been added to stable-queue, so I am dropping it from
this post.

Cheers,
Andre.

James Morse (2):
  KVM: arm64: Add kvm_extable for vaxorcism code
  KVM: arm64: Survive synchronous exceptions caused by AT instructions

 arch/arm64/include/asm/kvm_asm.h | 43 +++++++++++++++++++++
 arch/arm64/kernel/vmlinux.lds.S  |  8 ++++
 arch/arm64/kvm/hyp/entry.S       | 15 +++++---
 arch/arm64/kvm/hyp/hyp-entry.S   | 65 ++++++++++++++++++++------------
 arch/arm64/kvm/hyp/switch.c      | 39 +++++++++++++++++--
 5 files changed, 136 insertions(+), 34 deletions(-)