[0/2] Fixes for FWB

Message

Quentin Perret March 17, 2021, 2:17 p.m. UTC

Hi folks,

This is an alternative solution to the KVM_PGTABLE_PROT_S2_NOFWB patch I
shared earlier (and which is a bit of a hack).

With this series we basically force FWB off for the host stage-2, even
when the CPUs support it. This is done by passing flags to the pgtable
init function, and propagating it down where needed. It's a bit more
intrusive, but cleaner conceptually.

Thoughts?

Thanks,
Quentin

Quentin Perret (2):
  KVM: arm64: Introduce KVM_PGTABLE_S2_NOFWB Stage-2 flag
  KVM: arm64: Disable FWB in host stage-2

 arch/arm64/include/asm/kvm_pgtable.h  | 19 +++++++++--
 arch/arm64/include/asm/pgtable-prot.h |  4 +--
 arch/arm64/kvm/hyp/nvhe/mem_protect.c |  6 ++--
 arch/arm64/kvm/hyp/pgtable.c          | 49 +++++++++++++++++----------
 4 files changed, 52 insertions(+), 26 deletions(-)