linux-kernel - Re: [PATCH v3 02/15] KVM: arm64: Provide {get,put}

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Message-ID: <20211209101226.GB1833@willie-the-truck>
Date:   Thu, 9 Dec 2021 10:12:27 +0000
From:   Will Deacon <will@...nel.org>
To:     Quentin Perret <qperret@...gle.com>
Cc:     Marc Zyngier <maz@...nel.org>, James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: Re: [PATCH v3 02/15] KVM: arm64: Provide {get,put}_page() stubs for
 early hyp allocator

On Wed, Dec 01, 2021 at 05:03:56PM +0000, Quentin Perret wrote:
> In nVHE protected mode, the EL2 code uses a temporary allocator during
> boot while re-creating its stage-1 page-table. Unfortunately, the
> hyp_vmmemap is not ready to use at this stage, so refcounting pages
> is not possible. That is not currently a problem because hyp stage-1
> mappings are never removed, which implies refcounting of page-table
> pages is unnecessary.
> 
> In preparation for allowing hypervisor stage-1 mappings to be removed,
> provide stub implementations for {get,put}_page() in the early allocator.
> 
> Signed-off-by: Quentin Perret <qperret@...gle.com>
> ---
>  arch/arm64/kvm/hyp/nvhe/early_alloc.c | 5 +++++
>  1 file changed, 5 insertions(+)

Acked-by: Will Deacon <will@...nel.org>

Will