linux-kernel - Re: [PATCH 3/3] KVM: use vcalloc/__vcalloc for very large allocations

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Message-Id: <20220309201814.241f39d9ed2f6671c636ece4@linux-foundation.org>
Date:   Wed, 9 Mar 2022 20:18:14 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 3/3] KVM: use vcalloc/__vcalloc for very large
 allocations

On Tue,  8 Mar 2022 05:59:18 -0500 Paolo Bonzini <pbonzini@...hat.com> wrote:

> Allocations whose size is related to the memslot size can be arbitrarily
> large.  Do not use kvzalloc/kvcalloc, as those are limited to "not crazy"
> sizes that fit in 32 bits.  Now that it is available, they can use either
> vcalloc or __vcalloc, the latter if accounting is required.
> 
> Cc: stable@...r.kernel.org

Please fully describe the end user visible runtime effects when
proposing a -stable backport.  And when not proposing a -stable
backport, come to that...