linux-kernel - Re: [PATCH 1/6] KVM: arm64: pkvm: Fix hyp

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Message-ID: <20211208172720.GB820@willie-the-truck>
Date:   Wed, 8 Dec 2021 17:27:21 +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 1/6] KVM: arm64: pkvm: Fix hyp_pool max order

On Wed, Dec 08, 2021 at 03:22:54PM +0000, Quentin Perret wrote:
> The EL2 page allocator in protected mode maintains a per-pool max order
> value to optimize allocations when the memory region it covers is small.
> However, the max order value is currently under-estimated whenever the
> number of pages in the region is a power of two. Fix the estimation.
> 
> Signed-off-by: Quentin Perret <qperret@...gle.com>
> ---
>  arch/arm64/kvm/hyp/nvhe/page_alloc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

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

Will