[PATCH v2 0/3] KVM: arm64: aarch32 ACTLR accesses

From: James Morse <james.morse@arm.com>
To: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org
Cc: Marc Zyngier <maz@kernel.org>
Subject: [PATCH v2 0/3] KVM: arm64: aarch32 ACTLR accesses
Date: Fri, 29 May 2020 15:06:53 +0000	[thread overview]
Message-ID: <20200529150656.7339-1-james.morse@arm.com> (raw)

Hello!

Changes since v1:
 * Patches 2 & 3 have been swapped.
 * Copy access_vm_reg() to swizzle 32bit offets back to 64bit
 * Peek at the encoding to tell ACTLR and ACTLR2 apart...

I didn't pick up the suggestion to remove the ACTLR_EL1 storage from
sys_regs[] as this turns out to break migration. Fixing it would require
a get_user() helper, which has a different prototype to access_actlr(),
would be noisier overall.

~

Patch 1 fixes an issue where the 32bit and 64bit indexes into copro[]
and sys_regs[] are muddled.

Patch 2 adds support for aarch32 accessing the top 32bits of ACTLR_EL1
via ACTLR2. Support for this register is advertised in ID_MMFR4.AC2, which
doesn't get removed by cpufeature. The register is mandatory from v8.2, but
imp-def before then.

Patch 3 stops the sys_regs[] value we use for emulation being save/restored.

I think Patch 1 is stable material, I'm not sure about 2&3.

Thanks,

James Morse (3):
  KVM: arm64: Stop writing aarch32's CSSELR into ACTLR
  KVM: arm64: Add emulation for 32bit guests accessing ACTLR2
  KVM: arm64: Stop save/restoring ACTLR_EL1

 arch/arm64/kvm/hyp/sysreg-sr.c       |  2 --
 arch/arm64/kvm/sys_regs.c            | 12 ++++++++----
 arch/arm64/kvm/sys_regs_generic_v8.c | 10 ++++++++++
 3 files changed, 18 insertions(+), 6 deletions(-)

-- 
2.20.1

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