linux-kernel - Re: [PATCH v5 31/36] KVM: arm64: Add kvm_pgtable_stage2_find

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Message-ID: <20210315163107.GA3430@willie-the-truck>
Date:   Mon, 15 Mar 2021 16:31:07 +0000
From:   Will Deacon <will@...nel.org>
To:     Quentin Perret <qperret@...gle.com>
Cc:     catalin.marinas@....com, maz@...nel.org, james.morse@....com,
        julien.thierry.kdev@...il.com, suzuki.poulose@....com,
        android-kvm@...gle.com, seanjc@...gle.com, mate.toth-pal@....com,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        linux-arm-kernel@...ts.infradead.org, kernel-team@...roid.com,
        kvmarm@...ts.cs.columbia.edu, tabba@...gle.com, ardb@...nel.org,
        mark.rutland@....com, dbrazdil@...gle.com
Subject: Re: [PATCH v5 31/36] KVM: arm64: Add kvm_pgtable_stage2_find_range()

On Mon, Mar 15, 2021 at 02:35:31PM +0000, Quentin Perret wrote:
> Since the host stage 2 will be identity mapped, and since it will own
> most of memory, it would preferable for performance to try and use large
> block mappings whenever that is possible. To ease this, introduce a new
> helper in the KVM page-table code which allows to search for large
> ranges of available IPA space. This will be used in the host memory
> abort path to greedily idmap large portion of the PA space.
> 
> Signed-off-by: Quentin Perret <qperret@...gle.com>
> ---
>  arch/arm64/include/asm/kvm_pgtable.h | 29 +++++++++
>  arch/arm64/kvm/hyp/pgtable.c         | 89 ++++++++++++++++++++++++++--
>  2 files changed, 114 insertions(+), 4 deletions(-)

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

Will