From patchwork Thu Dec 12 15:55:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13905465 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2D60022333A; Thu, 12 Dec 2024 15:56:42 +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=1734019004; cv=none; b=Rf9BxMYOBIg46s8G4jzEOB1hIF6oR6I/PYAtZCUkotD422H51dQpyouIm5bLnphuM8OHEih1ugpNLgDkHPegimw8IVA+OHacr9/RFzsVQA8gHGBqTYBOU/SzqxzO1+DDgP5zrrjN1b0pO4Owp529rOMy4wtg5VjPC4CtM8ww430= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734019004; c=relaxed/simple; bh=k4fSWekPGrYxWdpZUVAYUGnGtvOplu66Pg9Uq5xYutM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t2PLmhwgVtI5Lvzm0By5KSwS42981gtUnRB9kdNR6Lsg77b8H4ndzYWOGZ5EOx7cARjdX5iCaSGhtBo7dREb38zUc8MRvWkNKbjGIP+xHjwLtYtLnXEGpn/rOSALPrssgvJ0qM9fx8HsVqfCNTY14E6qaLsi/Xg+3Wq8DhT5/qA= 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 A81271764; Thu, 12 Dec 2024 07:57:10 -0800 (PST) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.39.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3A2063F720; Thu, 12 Dec 2024 07:56:38 -0800 (PST) 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 , "Aneesh Kumar K . V" , Steven Price Subject: [PATCH v6 01/43] KVM: Prepare for handling only shared mappings in mmu_notifier events Date: Thu, 12 Dec 2024 15:55:26 +0000 Message-ID: <20241212155610.76522-2-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241212155610.76522-1-steven.price@arm.com> References: <20241212155610.76522-1-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 401439bb21e3..86088968107a 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -260,6 +260,8 @@ 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 de2c11dae231..17727f1330ff 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -593,6 +593,13 @@ 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; /*