linux-kernel - [PATCH v3 0/4] Selftest for pKVM ownership transitions

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Message-ID: <20250416160900.3078417-1-qperret@google.com>
Date: Wed, 16 Apr 2025 16:08:56 +0000
From: Quentin Perret <qperret@...gle.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
	Joey Gouly <joey.gouly@....com>, Suzuki K Poulose <suzuki.poulose@....com>, 
	Zenghui Yu <yuzenghui@...wei.com>, Catalin Marinas <catalin.marinas@....com>, 
	Will Deacon <will@...nel.org>
Cc: Quentin Perret <qperret@...gle.com>, linux-arm-kernel@...ts.infradead.org, 
	kvmarm@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/4] Selftest for pKVM ownership transitions

Hi all,

This is the v3 of the pKVM selftest series, v2 was here [1]. This series
depends on [2] which moves the hyp tracking to the vmemmap. A full
stack on top of v6.15-rc2 with everything applied is available here:

    https://android-kvm.googlesource.com/linux qperret/pkvm-selftest-v3

Changes since v2:
 - rebased on top of v2 of the hyp-state-in-vmemmap series [2];
 - thanks to above rebase, dropped the PKVM_SELFTEST kconfig option and
   folded the selftest under the existing NVHE_EL2_DEBUG;
 - fixed commit message of patch 02

Changes since v1:
 - added support for testing NP guest transitions;
 - added .data section in pKVM to allow using non-zero globals (needed
   for previous point);
 - dropped superfluous WARN() from __pkvm_host_share_guest() which is a
   pain for testing;
 - updated assertions for hyp/host transitions according to the
   discussion on v1.

[1] https://lore.kernel.org/kvmarm/20250225015327.3708420-1-qperret@google.com/
[2] https://lore.kernel.org/kvmarm/20250416152648.2982950-1-qperret@google.com/

Thanks,
Quentin

David Brazdil (1):
  KVM: arm64: Add .hyp.data section

Quentin Perret (3):
  KVM: arm64: Don't WARN from __pkvm_host_share_guest()
  KVM: arm64: Selftest for pKVM transitions
  KVM: arm64: Extend pKVM selftest for np-guests

 arch/arm64/include/asm/kvm_pkvm.h             |   6 +
 arch/arm64/include/asm/sections.h             |   1 +
 arch/arm64/kernel/image-vars.h                |   2 +
 arch/arm64/kernel/vmlinux.lds.S               |  18 +-
 arch/arm64/kvm/arm.c                          |   7 +
 arch/arm64/kvm/hyp/include/nvhe/mem_protect.h |   6 +
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S             |   2 +
 arch/arm64/kvm/hyp/nvhe/mem_protect.c         | 198 +++++++++++++++++-
 arch/arm64/kvm/hyp/nvhe/setup.c               |  12 ++
 arch/arm64/kvm/pkvm.c                         |   2 +
 10 files changed, 250 insertions(+), 4 deletions(-)

-- 
2.49.0.604.gff1f9ca942-goog