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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id jz27sm944475ejc.33.2021.06.24.02.42.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 24 Jun 2021 02:42:35 -0700 (PDT) Subject: Re: [PATCH 2/6] KVM: mmu: also return page from gfn_to_pfn To: Nicholas Piggin , Aleksandar Markovic , Huacai Chen , Marc Zyngier , Paul Mackerras , David Stevens , Zhenyu Wang , Zhi Wang Cc: Alexandru Elisei , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, James Morse , Jim Mattson , Joerg Roedel , kvmarm@lists.cs.columbia.edu, kvm-ppc@vger.kernel.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Sean Christopherson , Suzuki K Poulose , Vitaly Kuznetsov , Wanpeng Li , Will Deacon References: <20210624035749.4054934-1-stevensd@google.com> <20210624035749.4054934-3-stevensd@google.com> <1624524331.zsin3qejl9.astroid@bobo.none> From: Paolo Bonzini Message-ID: <201b68a7-10ea-d656-0c1e-5511b1f22674@redhat.com> Date: Thu, 24 Jun 2021 11:42:33 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <1624524331.zsin3qejl9.astroid@bobo.none> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 24/06/21 10:52, Nicholas Piggin wrote: >> For now, wrap all calls to gfn_to_pfn functions in the new helper >> function. Callers which don't need the page struct will be updated in >> follow-up patches. > Hmm. You mean callers that do need the page will be updated? Normally > if there will be leftover users that don't need the struct page then > you would go the other way and keep the old call the same, and add a new > one (gfn_to_pfn_page) just for those that need it. Needing kvm_pfn_page_unwrap is a sign that something might be buggy, so it's a good idea to move the short name to the common case and the ugly kvm_pfn_page_unwrap(gfn_to_pfn(...)) for the weird one. In fact I'm not sure there should be any kvm_pfn_page_unwrap in the end. Paolo