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

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Date:   Mon, 22 Nov 2021 16:27:15 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Raghavendra Rao Ananta <rananta@...gle.com>
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

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.

Happy to queue additional patches on top if you want to deal with
riscv.

Thanks,

	M.

[1] https://lore.kernel.org/all/20211018211158.3050779-1-maz@kernel.org/

-- 
Without deviation from the norm, progress is not possible.