[PATCH v2 0/4] KVM: arm64: Fixes to early stage-2 fault handling

From: Will Deacon <will@kernel.org>
To: kvmarm@lists.cs.columbia.edu
Cc: kernel-team@android.com, Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 0/4] KVM: arm64: Fixes to early stage-2 fault handling
Date: Wed, 29 Jul 2020 11:28:17 +0100	[thread overview]
Message-ID: <20200729102821.23392-1-will@kernel.org> (raw)

Hi all,

This is version two of the patches I posted last week:

  https://lore.kernel.org/r/20200724143506.17772-1-will@kernel.org

I got my brain in a twist with exactly what is reported in HPFAR for
a stage-2 abort on a stage-1 table walk, so I don't think any of these
are serious any more.

With these changes, the early stage-2 fault handling follows:

S2 instruction abort:
  * Not in memslot, or S2 fault on S1 walk for tables in R/O memslot:
	=> inject external iabt to guest

S2 data abort:
  * Not in memslot:
    - S2 fault on S1 walk:      inject external dabt to guest
    - Cache maintenance:        skip instr
    - Syndrome valid            EXIT_MMIO
    - Syndrome invalid          EXIT_NISV
  * Write fault in R/O memslot:
    - S2 fault on S1 walk:      inject external dabt to guest
    - Access is write:
      - Syndrome valid          EXIT_MMIO
      - Syndrome invalid        EXIT_NISV (includes cache maintenance)

Everything else gets handled by handle_access_fault()/user_mem_abort().

Will

Cc: James Morse <james.morse@arm.com>
Cc: Suzuki Poulose <suzuki.poulose@arm.com>
Cc: kernel-team@android.com

--->8

Will Deacon (4):
  KVM: arm64: Rename kvm_vcpu_dabt_isextabt()
  KVM: arm64: Handle data and instruction external aborts the same way
  KVM: arm64: Don't skip cache maintenance for read-only memslots
  KVM: arm64: Move S1PTW S2 fault logic out of io_mem_abort()

 arch/arm64/include/asm/kvm_emulate.h |  2 +-
 arch/arm64/kvm/hyp/switch.c          |  2 +-
 arch/arm64/kvm/mmio.c                |  6 ------
 arch/arm64/kvm/mmu.c                 | 26 +++++++++++++++++---------
 4 files changed, 19 insertions(+), 17 deletions(-)

-- 
2.28.0.rc0.142.g3c755180ce-goog

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