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([2001:b07:6468:f312:3473:41cf:8b30:f2e1]) by smtp.googlemail.com with ESMTPSA id v1sm69334041wrw.90.2019.01.07.08.34.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Jan 2019 08:34:03 -0800 (PST) Subject: Re: [PATCH 3/11] KVM: Add spte's point in the struct kvm_mmu_page To: lantianyu1986@gmail.com Cc: kvm@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, paulus@ozlabs.org, hpa@zytor.com, kys@microsoft.com, kvmarm@lists.cs.columbia.edu, mpe@ellerman.id.au, x86@kernel.org, linux@armlinux.org.uk, michael.h.kelley@microsoft.com, mingo@redhat.com, benh@kernel.crashing.org, jhogan@kernel.org, linux-mips@vger.kernel.org, Lan Tianyu , marc.zyngier@arm.com, kvm-ppc@vger.kernel.org, bp@alien8.de, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, ralf@linux-mips.org, paul.burton@mips.com, vkuznets@redhat.com, linuxppc-dev@lists.ozlabs.org References: <20190104085405.40356-1-Tianyu.Lan@microsoft.com> <20190104085405.40356-4-Tianyu.Lan@microsoft.com> From: Paolo Bonzini Openpgp: preference=signencrypt Autocrypt: addr=pbonzini@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <20190104085405.40356-4-Tianyu.Lan@microsoft.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/01/19 09:53, lantianyu1986@gmail.com wrote: > @@ -332,6 +332,7 @@ struct kvm_mmu_page { > int root_count; /* Currently serving as active root */ > unsigned int unsync_children; > struct kvm_rmap_head parent_ptes; /* rmap pointers to parent sptes */ > + u64 *sptep; Is this really needed? Can we put the "last" flag in the struct instead as a bool? In fact, if you do u16 unsync_children; bool unsync; bool last_level; the struct does not grow at all. :) (I'm not sure where "large" is tested using the sptep field, even though it is in the commit message). Paolo > /* The page is obsolete if mmu_valid_gen != kvm->arch.mmu_valid_gen. */ > unsigned long mmu_valid_gen;