linux-kernel - [PATCH 0/3] KVM: arm64: M2 vgic maintenance interrupt rework pre-NV

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Date:   Tue,  3 Jan 2023 09:49:50 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     <kvmarm@...ts.cs.columbia.edu>, <kvmarm@...ts.linux.dev>
Cc:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Oliver Upton <oliver.upton@...ux.dev>, asahi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] KVM: arm64: M2 vgic maintenance interrupt rework pre-NV

Hi all,

I've spent the holiday break reviving the Nested Virt KVM/arm64
implementation[1] and allowing it to work on the Apple M2 SoC. The
amusing part is that it actually works!

However, the way the vgic is implemented on this HW is still at odds
with the rest of the architecture, and requires some hacks, some of
which are independent of the actual NV code. This is what this series
is about.

The first patch places M2 on the naughty list of broken SEIS
implementations, just like the M1 before it. The second patch allows
a vgic MI to be registered, even if this MI cannot be masked (we
disable it at the source anyway). The last patch hacks the AIC driver
to actually register the vgic MI with KVM.

I plan to take the first patch as a fix for 6.2, while the rest can be
deferred to 6.3.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=kvm-arm64/nv-6.2-WIP

Marc Zyngier (3):
  KVM: arm64: vgic: Add Apple M2 cpus to the list of broken SEIS
    implementations
  KVM: arm64: vgic: Allow registration of a non-maskable maintenance
    interrupt
  irqchip/apple-aic: Register vgic maintenance interrupt with KVM

 arch/arm64/include/asm/cputype.h |  4 +++
 arch/arm64/kvm/vgic/vgic-init.c  |  2 +-
 arch/arm64/kvm/vgic/vgic-v3.c    |  3 +-
 drivers/irqchip/irq-apple-aic.c  | 55 ++++++++++++++++++++++++--------
 4 files changed, 49 insertions(+), 15 deletions(-)

-- 
2.34.1