From patchwork Wed Aug 21 15:38:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13771785 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C9E9E15381C; Wed, 21 Aug 2024 15:39:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724254757; cv=none; b=pRxcUOtJ+F+3QaYkgmzBGEsssEmanpKWfXbwrQ89P+oCaVDyqpINbj0z3g1Zs9xKQJxC/OAMi/cQw5U0wBCM/rgruWpUgCUtWLWks5HpscsQusxHMNITLiEBU4ZwGeIRnEOdAAGcZ0CTfex9Ssg6fC9kUT7PqdFZ1ybrbz0X7lo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724254757; c=relaxed/simple; bh=54Ptsmbp6ObfHrpA040MuGlN8qVZzJgfKXDO3oDMwHg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=kX4BmKVyE/ENa9vmNibp0y6HifiWx2eT5uMqo5z/VbKyl1d9oQSY/E6K/fXhY0Fvn/WJLXdhSSn/gANTIfoGZzhXdOp9GLz4jsVN2yIJXFxqzqGuoBMb1Spu3DSSuU/Duc/yDYhNDv8kr+04WqlTuAWO/8+/tH8piPFQyw1Uhlc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5145C1516; Wed, 21 Aug 2024 08:39:41 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.37.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 34DCA3F73B; Wed, 21 Aug 2024 08:39:12 -0700 (PDT) From: Steven Price To: 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 , Gavin Shan , Shanker Donthineni , Alper Gun , Steven Price Subject: [PATCH v4 02/43] kvm: arm64: pgtable: Track the number of pages in the entry level Date: Wed, 21 Aug 2024 16:38:03 +0100 Message-Id: <20240821153844.60084-3-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240821153844.60084-1-steven.price@arm.com> References: <20240821153844.60084-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Suzuki K Poulose Keep track of the number of pages allocated for the top level PGD, rather than computing it everytime (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(-) diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h index 19278dfe7978..0350c08ada7a 100644 --- a/arch/arm64/include/asm/kvm_pgtable.h +++ b/arch/arm64/include/asm/kvm_pgtable.h @@ -362,6 +362,7 @@ 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. @@ -372,6 +373,7 @@ 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 9e2bbee77491..fb6675838b65 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -1574,7 +1574,8 @@ 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; @@ -1626,7 +1627,7 @@ 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; }