From patchwork Wed Aug 21 15:38:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13771784 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 80A8714F138; Wed, 21 Aug 2024 15:39:12 +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=1724254754; cv=none; b=oHB0AkZN1nnX6Q4KUs3w8ytsL7fbRX1hFzJTbjkhhzAKMzxyTA4kdLnGzSYQLQ72i6WYvXenaAEh53fgHW6UhA6KObs3sg0ZB2sN8WYWXD5dTVxn+05drpr7KzJ/9axkSanv76sFqyu1d+9jfaFUu4b6fAVxXu+xvlfNe/tierE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724254754; c=relaxed/simple; bh=zcOPn8e4O2/SiU5E/IgcuLVl5wIY6qSJueogdKcKYXc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nHf7BsdQNFnEKSqEsJiA3VYxOP2N3HOCR4LaktTG/HJ5/yjAG1frcrT1SkJBN9ED6qmhFWcS4lM1nDSvaNIEWg7aoukj91IPgIUjwHEr99JWWMuqdVAoRCV+EnUh/7gJzxKVYRxkzyVCJFJ3AxiCAIBIrjeo0aoWlZ2iXH3NXLs= 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 0CA3CFEC; Wed, 21 Aug 2024 08:39:38 -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 559163F73B; Wed, 21 Aug 2024 08:39:08 -0700 (PDT) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Sean Christopherson , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , 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 01/43] KVM: Prepare for handling only shared mappings in mmu_notifier events Date: Wed, 21 Aug 2024 16:38:02 +0100 Message-Id: <20240821153844.60084-2-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: Sean Christopherson Add flags to "struct kvm_gfn_range" to let notifier events target only shared and only private mappings, and write up the existing mmu_notifier events to be shared-only (private memory is never associated with a userspace virtual address, i.e. can't be reached via mmu_notifiers). Add two flags so that KVM can handle the three possibilities (shared, private, and shared+private) without needing something like a tri-state enum. Link: https://lore.kernel.org/all/ZJX0hk+KpQP0KUyB@google.com Signed-off-by: Sean Christopherson Signed-off-by: Steven Price --- include/linux/kvm_host.h | 2 ++ virt/kvm/kvm_main.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 689e8be873a7..7393377c7656 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -265,6 +265,8 @@ struct kvm_gfn_range { gfn_t start; gfn_t end; union kvm_mmu_notifier_arg arg; + bool only_private; + bool only_shared; bool may_block; }; bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d0788d0a72cc..eaf16195b104 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -631,6 +631,13 @@ static __always_inline kvm_mn_ret_t __kvm_handle_hva_range(struct kvm *kvm, * the second or later invocation of the handler). */ gfn_range.arg = range->arg; + + /* + * HVA-based notifications aren't relevant to private + * mappings as they don't have a userspace mapping. + */ + gfn_range.only_private = false; + gfn_range.only_shared = true; gfn_range.may_block = range->may_block; /*