linux-kernel - [PATCH v2 0/2] KVM : selftests: arm64: Explicitly set the page attrs to Inner-Shareable

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Message-ID: <20250405001042.1470552-1-rananta@google.com>
Date: Sat,  5 Apr 2025 00:10:40 +0000
From: Raghavendra Rao Ananta <rananta@...gle.com>
To: Oliver Upton <oliver.upton@...ux.dev>, Marc Zyngier <maz@...nel.org>
Cc: Raghavendra Rao Anata <rananta@...gle.com>, Mingwei Zhang <mizhang@...gle.com>, 
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH v2 0/2] KVM : selftests: arm64: Explicitly set the page attrs
 to Inner-Shareable

The series fixes a conflict in memory attributes in some
implementations,
such as Neoverse-N3, that causes a data abort in guest EL1 with FSC
0x35 (IMPLEMENTATION DEFINED fault (Unsupported Exclusive or Atomic
access)).

Patch-1 is a cleanup patch that replaces numbers (and comments) to
using proper macros for hardware configuration, such as registers and
page-table entries.

Patch-2 fixes the actual bug and sets the page attrs to Inner-Shareable
by default for the VMs created in the selftests. More details are
presented in the commit text.

v1: https://lore.kernel.org/all/20250404220659.1312465-1-rananta@google.com/

v1 -> v2: Addressed Oliver's comments (thank you)
 - Moved the TCR_* macros from tools' sysreg.h to selftests' local processor.h
   in patch-1.
 - Adjsted the citations to describe the issue more appropriately in
   patch-2.

Raghavendra Rao Ananta (2):
  KVM: selftests: arm64: Introduce and use hardware-definition macros
  KVM: selftests: arm64: Explicitly set the page attrs to
    Inner-Shareable

 .../selftests/kvm/arm64/page_fault_test.c     |  2 +-
 .../selftests/kvm/include/arm64/processor.h   | 67 +++++++++++++++++--
 .../selftests/kvm/lib/arm64/processor.c       | 60 ++++++++++-------
 3 files changed, 96 insertions(+), 33 deletions(-)


base-commit: 38fec10eb60d687e30c8c6b5420d86e8149f7557
-- 
2.49.0.504.g3bcea36a83-goog