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Tue, 22 Oct 2024 21:03:12 -0700 (PDT) X-Google-Smtp-Source: AGHT+IF7Nzd7b22QkSrSkT2X54oW0FrLiZkrnYmJFDKn3Ga/iSi3gYtHtDYeZYfv+zNxnl5T9y8tvQ== X-Received: by 2002:a17:90b:4c4b:b0:2e2:e148:3d30 with SMTP id 98e67ed59e1d1-2e76b60d401mr1664999a91.23.1729656192357; Tue, 22 Oct 2024 21:03:12 -0700 (PDT) Received: from [192.168.68.54] ([180.233.125.129]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e76e088f1fsm273930a91.56.2024.10.22.21.03.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 22 Oct 2024 21:03:11 -0700 (PDT) Message-ID: <032d29e7-b6a3-4493-833b-a9b6d9496a75@redhat.com> Date: Wed, 23 Oct 2024 14:03:03 +1000 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 02/43] kvm: arm64: pgtable: Track the number of pages in the entry level To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Suzuki K Poulose , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" References: <20241004152804.72508-1-steven.price@arm.com> <20241004152804.72508-3-steven.price@arm.com> From: Gavin Shan In-Reply-To: <20241004152804.72508-3-steven.price@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/5/24 1:27 AM, Steven Price wrote: > From: Suzuki K Poulose > > Keep track of the number of pages allocated for the top level PGD, > rather than computing it every time (though we need it only twice now). > This will be used later by Arm CCA KVM changes. > > Signed-off-by: Suzuki K Poulose > Signed-off-by: Steven Price > --- > arch/arm64/include/asm/kvm_pgtable.h | 2 ++ > arch/arm64/kvm/hyp/pgtable.c | 5 +++-- > 2 files changed, 5 insertions(+), 2 deletions(-) > If we really want to have the number of pages for the top level PGDs, the existing helpers kvm_pgtable_stage2_pgd_size() for the same purpose needs to replaced by (struct kvm_pgtable::pgd_pages << PAGE_SHIFT) and then removed. The alternative would be just to use kvm_pgtable_stage2_pgd_size() instead of introducing struct kvm_pgtable::pgd_pages, which will be used in the slow paths where realm is created or destroyed. > diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h > index 03f4c3d7839c..25b512756200 100644 > --- a/arch/arm64/include/asm/kvm_pgtable.h > +++ b/arch/arm64/include/asm/kvm_pgtable.h > @@ -404,6 +404,7 @@ static inline bool kvm_pgtable_walk_lock_held(void) > * struct kvm_pgtable - KVM page-table. > * @ia_bits: Maximum input address size, in bits. > * @start_level: Level at which the page-table walk starts. > + * @pgd_pages: Number of pages in the entry level of the page-table. > * @pgd: Pointer to the first top-level entry of the page-table. > * @mm_ops: Memory management callbacks. > * @mmu: Stage-2 KVM MMU struct. Unused for stage-1 page-tables. > @@ -414,6 +415,7 @@ static inline bool kvm_pgtable_walk_lock_held(void) > struct kvm_pgtable { > u32 ia_bits; > s8 start_level; > + u8 pgd_pages; > kvm_pteref_t pgd; > struct kvm_pgtable_mm_ops *mm_ops; > > diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c > index b11bcebac908..9e1be28c3dc9 100644 > --- a/arch/arm64/kvm/hyp/pgtable.c > +++ b/arch/arm64/kvm/hyp/pgtable.c > @@ -1534,7 +1534,8 @@ int __kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu, > u32 sl0 = FIELD_GET(VTCR_EL2_SL0_MASK, vtcr); > s8 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0; > > - pgd_sz = kvm_pgd_pages(ia_bits, start_level) * PAGE_SIZE; > + pgt->pgd_pages = kvm_pgd_pages(ia_bits, start_level); > + pgd_sz = pgt->pgd_pages * PAGE_SIZE; > pgt->pgd = (kvm_pteref_t)mm_ops->zalloc_pages_exact(pgd_sz); > if (!pgt->pgd) > return -ENOMEM; > @@ -1586,7 +1587,7 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt) > }; > > WARN_ON(kvm_pgtable_walk(pgt, 0, BIT(pgt->ia_bits), &walker)); > - pgd_sz = kvm_pgd_pages(pgt->ia_bits, pgt->start_level) * PAGE_SIZE; > + pgd_sz = pgt->pgd_pages * PAGE_SIZE; > pgt->mm_ops->free_pages_exact(kvm_dereference_pteref(&walker, pgt->pgd), pgd_sz); > pgt->pgd = NULL; > } Thanks, Gavin