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From:   Oliver Upton <oupton@google.com>
Date:   Sun, 15 Aug 2021 00:50:09 -0700
Message-ID: <CAOQ_Qsj0UH=3FQNP3NTjX-rcU68s0hm6k5g7i_rwqKc4b84DZA@mail.gmail.com>
Subject: Re: [PATCH v3 0/3] KVM: arm64: Use generic guest entry infrastructure
To:     kvmarm@lists.cs.columbia.edu
Cc:     kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
        Paolo Bonzini <pbonzini@redhat.com>,
        Marc Zyngier <maz@kernel.org>,
        James Morse <james.morse@arm.com>,
        Alexandru Elisei <Alexandru.Elisei@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Andy Lutomirski <luto@kernel.org>,
        linux-arm-kernel@lists.infradead.org,
        Peter Shier <pshier@google.com>,
        Shakeel Butt <shakeelb@google.com>,
        Guangyu Shi <guangyus@google.com>
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Precedence: bulk

Friendly ping :)

--
Thanks,
Oliver

On Mon, Aug 2, 2021 at 12:28 PM Oliver Upton <oupton@google.com> wrote:
>
> The arm64 kernel doesn't yet support the full generic entry
> infrastructure. That being said, KVM/arm64 doesn't properly handle
> TIF_NOTIFY_RESUME and could pick this up by switching to the generic
> guest entry infrasturture.
>
> Patch 1 adds a missing vCPU stat to ARM64 to record the number of signal
> exits to userspace.
>
> Patch 2 unhitches entry-kvm from entry-generic, as ARM64 doesn't
> currently support the generic infrastructure.
>
> Patch 3 replaces the open-coded entry handling with the generic xfer
> function.
>
> This series was tested on an Ampere Mt. Jade reference system. The
> series cleanly applies to kvm/queue (note that this is deliberate as the
> generic kvm stats patches have not yet propagated to kvm-arm/queue) at
> the following commit:
>
> 8ad5e63649ff ("KVM: Don't take mmu_lock for range invalidation unless necessary")
>
> v1 -> v2:
>  - Address Jing's comment
>  - Carry Jing's r-b tag
>
> v2 -> v3:
>  - Roll all exit conditions into kvm_vcpu_exit_request() (Marc)
>  - Avoid needlessly checking for work twice (Marc)
>
> v1: http://lore.kernel.org/r/20210729195632.489978-1-oupton@google.com
> v2: http://lore.kernel.org/r/20210729220916.1672875-1-oupton@google.com
>
> Oliver Upton (3):
>   KVM: arm64: Record number of signal exits as a vCPU stat
>   entry: KVM: Allow use of generic KVM entry w/o full generic support
>   KVM: arm64: Use generic KVM xfer to guest work function
>
>  arch/arm64/include/asm/kvm_host.h |  1 +
>  arch/arm64/kvm/Kconfig            |  1 +
>  arch/arm64/kvm/arm.c              | 71 +++++++++++++++++++------------
>  arch/arm64/kvm/guest.c            |  1 +
>  include/linux/entry-kvm.h         |  6 ++-
>  5 files changed, 52 insertions(+), 28 deletions(-)
>
> --
> 2.32.0.554.ge1b32706d8-goog
>