linux-kernel - [PATCH 0/3] KVM: arm64: Normalize cache configuration

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Message-Id: <20221211051700.275761-1-akihiko.odaki@daynix.com>
Date:   Sun, 11 Dec 2022 14:16:57 +0900
From:   Akihiko Odaki <akihiko.odaki@...nix.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Marc Zyngier <maz@...nel.org>, linux-kernel@...r.kernel.org,
        kvmarm@...ts.linux.dev, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        James Morse <james.morse@....com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        asahi@...ts.linux.dev, Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Sven Peter <sven@...npeter.dev>,
        Hector Martin <marcan@...can.st>,
        Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH 0/3] KVM: arm64: Normalize cache configuration

Before this change, the cache configuration of the physical CPU was
exposed to vcpus. This is problematic because the cache configuration a
vcpu sees varies when it migrates between vcpus with different cache
configurations.

Fabricate cache configuration from arm64_ftr_reg_ctrel0.sys_val, which
holds the CTR_EL0 value the userspace sees regardless of which physical
CPU it resides on.

HCR_TID2 is now always set as it is troublesome to detect the difference
of cache configurations among physical CPUs.

CSSELR_EL1 is now held in the memory instead of the corresponding
phyisccal register as the fabricated cache configuration may have a
cache level which does not exist in the physical CPU, and setting the
physical CSSELR_EL1 for the level results in an UNKNOWN behavior.

CLIDR_EL1 and CCSIDR_EL1 are now writable from the userspace so that
the VMM can restore the values saved with the old kernel.

Akihiko Odaki (3):
  arm64/sysreg: Add CCSIDR2_EL1
  arm64/cache: Move CLIDR macro definitions
  KVM: arm64: Normalize cache configuration

 arch/arm64/include/asm/cache.h             |   6 +
 arch/arm64/include/asm/kvm_arm.h           |   3 +-
 arch/arm64/include/asm/kvm_emulate.h       |   4 -
 arch/arm64/include/asm/kvm_host.h          |   6 +-
 arch/arm64/kernel/cacheinfo.c              |   5 -
 arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h |   2 -
 arch/arm64/kvm/reset.c                     |   1 +
 arch/arm64/kvm/sys_regs.c                  | 232 ++++++++++++---------
 arch/arm64/tools/sysreg                    |   5 +
 9 files changed, 153 insertions(+), 111 deletions(-)

-- 
2.38.1