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Date: Mon, 8 Apr 2024 09:35:21 +0200
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Subject: Re: [PATCH 3/4] mmu_notifier: remove the .change_pte() callback
To: Paolo Bonzini <pbonzini@redhat.com>, linux-kernel@vger.kernel.org,
 kvm@vger.kernel.org
Cc: Marc Zyngier <maz@kernel.org>, Oliver Upton <oliver.upton@linux.dev>,
 Tianrui Zhao <zhaotianrui@loongson.cn>, Bibo Mao <maobibo@loongson.cn>,
 Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
 Nicholas Piggin <npiggin@gmail.com>, Anup Patel <anup@brainfault.org>,
 Atish Patra <atishp@atishpatra.org>, Sean Christopherson
 <seanjc@google.com>, Andrew Morton <akpm@linux-foundation.org>,
 linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
 loongarch@lists.linux.dev, linux-mips@vger.kernel.org,
 linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org,
 linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org,
 linux-perf-users@vger.kernel.org
References: <20240405115815.3226315-1-pbonzini@redhat.com>
 <20240405115815.3226315-4-pbonzini@redhat.com>
From: David Hildenbrand <david@redhat.com>
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In-Reply-To: <20240405115815.3226315-4-pbonzini@redhat.com>
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On 05.04.24 13:58, Paolo Bonzini wrote:
> The scope of set_pte_at_notify() has reduced more and more through the
> years.  Initially, it was meant for when the change to the PTE was
> not bracketed by mmu_notifier_invalidate_range_{start,end}().  However,
> that has not been so for over ten years.  During all this period
> the only implementation of .change_pte() was KVM and it
> had no actual functionality, because it was called after
> mmu_notifier_invalidate_range_start() zapped the secondary PTE.
> 
> Now that this (nonfunctional) user of the .change_pte() callback is
> gone, the whole callback can be removed.  For now, leave in place
> set_pte_at_notify() even though it is just a synonym for set_pte_at().
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Cheers,

David / dhildenb