From patchwork Thu Jan 12 19:19:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 13098684 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3D8DDC61DB3 for ; Thu, 12 Jan 2023 19:29:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240763AbjALT3U (ORCPT ); Thu, 12 Jan 2023 14:29:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47746 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240298AbjALT2L (ORCPT ); Thu, 12 Jan 2023 14:28:11 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C69ED34D4E for ; Thu, 12 Jan 2023 11:22:10 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 5B971B82016 for ; Thu, 12 Jan 2023 19:22:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0ACA6C433D2; Thu, 12 Jan 2023 19:22:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1673551328; bh=xIn67oeEcRZXTINWOZbHlbBDtWXVrZxsjZ4xyGShEXM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tBoR0r7l7SyDoVlaF2WmP0bfcVJlMc3FHpgl+lnUxThRdfysDiMAeqbXSwnYZEviI c6zTYNN9FHxaQ3D50WH/7ZgBSF4UL3c6N6C1FEbp4sYvMY5cuee0ME/LyPTiNkN61Q bfA8f8PpeNmQKzhBdgGHi69su0C7p82q+GQaREhozkBJC7BPNJZGnuMeBeIJwVYaNw iZ1A7jHvKfc0NBnyZe1SSHO8AYYbSVTf95wqgLztNCoM0zGqL2Gcv3GjhvtdZEwNFN 4kfd95ntmXGbi941DUeIIlWfPOl/mODzQXYlw7k2PVAyGox2tEAWaBiDGnTRJpWa1C jSck2G505M+Sw== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1pG37R-001IWu-Me; Thu, 12 Jan 2023 19:20:09 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Alexandru Elisei , Andre Przywara , Chase Conklin , Christoffer Dall , Ganapatrao Kulkarni , Jintack Lim , Russell King , James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: [PATCH v7 56/68] KVM: arm64: nv: Tag shadow S2 entries with nested level Date: Thu, 12 Jan 2023 19:19:15 +0000 Message-Id: <20230112191927.1814989-57-maz@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230112191927.1814989-1-maz@kernel.org> References: <20230112191927.1814989-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, alexandru.elisei@arm.com, andre.przywara@arm.com, chase.conklin@arm.com, christoffer.dall@arm.com, gankulkarni@os.amperecomputing.com, jintack@cs.columbia.edu, rmk+kernel@armlinux.org.uk, james.morse@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Populate bits [56:55] of the leaf entry with the level provided by the guest's S2 translation. Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_nested.h | 7 +++++++ arch/arm64/kvm/mmu.c | 16 ++++++++++++++-- 2 files changed, 21 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h index 63bb4898e2d9..5dd6b12b6ec0 100644 --- a/arch/arm64/include/asm/kvm_nested.h +++ b/arch/arm64/include/asm/kvm_nested.h @@ -5,6 +5,8 @@ #include #include +#include + static inline bool vcpu_has_nv(const struct kvm_vcpu *vcpu) { return (!__is_defined(__KVM_NVHE_HYPERVISOR__) && @@ -134,4 +136,9 @@ void access_nested_id_reg(struct kvm_vcpu *v, struct sys_reg_params *p, #define KVM_NV_GUEST_MAP_SZ (KVM_PGTABLE_PROT_SW1 | KVM_PGTABLE_PROT_SW0) +static inline u64 kvm_encode_nested_level(struct kvm_s2_trans *trans) +{ + return FIELD_PREP(KVM_NV_GUEST_MAP_SZ, trans->level); +} + #endif /* __ARM64_KVM_NESTED_H */ diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 68975a602faa..160bc994a47f 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1436,11 +1436,17 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, * Potentially reduce shadow S2 permissions to match the guest's own * S2. For exec faults, we'd only reach this point if the guest * actually allowed it (see kvm_s2_handle_perm_fault). + * + * Also encode the level of the nested translation in the SW bits of + * the PTE/PMD/PUD. This will be retrived on TLB invalidation from + * the guest. */ if (nested) { writable &= kvm_s2_trans_writable(nested); if (!kvm_s2_trans_readable(nested)) prot &= ~KVM_PGTABLE_PROT_R; + + prot |= kvm_encode_nested_level(nested); } read_lock(&kvm->mmu_lock); @@ -1489,12 +1495,18 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, * permissions only if vma_pagesize equals fault_granule. Otherwise, * kvm_pgtable_stage2_map() should be called to change block size. */ - if (fault_status == ESR_ELx_FSC_PERM && vma_pagesize == fault_granule) + if (fault_status == ESR_ELx_FSC_PERM && vma_pagesize == fault_granule) { + /* + * Drop the SW bits in favour of those stored in the + * PTE, which will be preserved. + */ + prot &= ~KVM_NV_GUEST_MAP_SZ; ret = kvm_pgtable_stage2_relax_perms(pgt, fault_ipa, prot); - else + } else { ret = kvm_pgtable_stage2_map(pgt, fault_ipa, vma_pagesize, __pfn_to_phys(pfn), prot, memcache, KVM_PGTABLE_WALK_SHARED); + } /* Mark the page dirty only if the fault is handled successfully */ if (writable && !ret) {