linux-kernel - Re: [RFC PATCH v2 02/11] KVM: Introduce kvm_vcpu_has_run

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Message-ID: <CAJHc60ysebqSukBLpZ9na7daoFr+sGB0PWw-_V5nFObjqdkSyg@mail.gmail.com>
Date:   Tue, 23 Nov 2021 10:31:53 -0800
From:   Raghavendra Rao Ananta <rananta@...gle.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Andrew Jones <drjones@...hat.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Peter Shier <pshier@...gle.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Oliver Upton <oupton@...gle.com>,
        Reiji Watanabe <reijiw@...gle.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [RFC PATCH v2 02/11] KVM: Introduce kvm_vcpu_has_run_once

Hello Marc,

On Mon, Nov 22, 2021 at 8:27 AM Marc Zyngier <maz@...nel.org> wrote:
>
> On Sat, 13 Nov 2021 01:22:25 +0000,
> Raghavendra Rao Ananta <rananta@...gle.com> wrote:
> >
> > Architectures such as arm64 and riscv uses vcpu variables
> > such as has_run_once and ran_atleast_once, respectively,
> > to mark if the vCPU has started running. Since these are
> > architecture agnostic variables, introduce
> > kvm_vcpu_has_run_once() as a core kvm functionality and
> > use this instead of the architecture defined variables.
> >
> > No functional change intended.
> >
> > Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
>
> arm64 is moving away from this, see [1]. You also don't need any new
> state, as vcpu->pid gives you exactly what you need.

Thanks for the pointer. I can directly use this!
>
> Happy to queue additional patches on top if you want to deal with
> riscv.
>
Just to clarify, you mean get the kvm support for riscv on kvmarm-next?
If yes, then sure, I can make changes in riscv to use
vcpu_has_run_once() from your series.

Regards,
Raghavendra


> Thanks,
>
>         M.
>
> [1] https://lore.kernel.org/all/20211018211158.3050779-1-maz@kernel.org/
>
> --
> Without deviation from the norm, progress is not possible.