From mboxrd@z Thu Jan 1 00:00:00 1970 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 21AA4CD37AC for ; Thu, 7 May 2026 20:23:38 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 266B96B00A4; Thu, 7 May 2026 16:23:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 132E26B00AA; Thu, 7 May 2026 16:23:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0487B6B00A7; Thu, 7 May 2026 16:22:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id D959D6B00A6 for ; Thu, 7 May 2026 16:22:59 -0400 (EDT) Received: from smtpin28.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id A553A16063B for ; Thu, 7 May 2026 20:22:59 +0000 (UTC) X-FDA: 84741747678.28.F4267FF Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf14.hostedemail.com (Postfix) with ESMTP id A71C110000A for ; Thu, 7 May 2026 20:22:57 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=U7IE5VMC; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf14.hostedemail.com: domain of devnull+ackerleytng.google.com@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=devnull+ackerleytng.google.com@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1778185377; a=rsa-sha256; cv=none; b=33RuGPbIqgyYNYUsUUa9R/iNhTifm0ZhlcqzXIabKYQga8ZhBp6Q/MEzZpeiC+b1j02Sec NUqyNTt7/cgU598EldejYsa5zbPHOsLiAlQQffh5k1MNi/gURZAJMuC0PaoGpUGL2XNuR4 Qib2amuUAtbw0abtmdKlsbfV6R4LSjE= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=U7IE5VMC; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf14.hostedemail.com: domain of devnull+ackerleytng.google.com@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=devnull+ackerleytng.google.com@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1778185377; h=from:from:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=vhoGviy+UVTc6DGzSNcPYdCQMg7q3HUnA246QAl8+cg=; b=7hVCTavBJzFC2Y01RlaKBaTa9vXQvYu5/IvtjqSjAU65veZ/U80mNhAPsokGO7ICo/jOv5 g0f97gtdHNcCn+i7hwXHwxY+fnsA7WAb6Lnnl4uXyioKtGt1utSRIXL3kOWLsx5Wi5aprj qdolLGpBTWGad+yfvJ4Oel678IcnSyc= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 1823344586; Thu, 7 May 2026 20:22:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id DB122C2BCB8; Thu, 7 May 2026 20:22:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778185371; bh=3Ey26oHjBIStPVcofdxUBpg3KGMQjwyU1xBvE1HXR/Q=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=U7IE5VMC2ljDDI4HbHXf4Kw6B1Fy8v4s/sLTufVnohETFAav41GH1jpeiNqNq7ybn unx4WTy1JjRF8TnUSld8sBIh/11hHa8eF5P8CkzvtEtL2UqbEfRF4VanGQTUI+0CD8 f7228jZ+GMz0Nx84zrFcgPSj5Q8G2MY8Z9MH5YhrMtETj+efv6VIJT6ySSIcS0L9gD Y+sHjYVHMSX9yJNszI6CSf7fOM8ZCLryJqtCUTO8dE9wHtc6QQSr/6GVu6FngJ7ub1 ZpXyLiJvE2YJlj6ANwKosP4nB2SJrhGBQR+YToMhFBCFNigYua6gBLz6gsyNod2lqb ptljHbFqJ3ekQ== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC027CD3446; Thu, 7 May 2026 20:22:50 +0000 (UTC) From: Ackerley Tng via B4 Relay Date: Thu, 07 May 2026 13:22:38 -0700 Subject: [PATCH v6 19/43] KVM: Let userspace disable per-VM mem attributes, enable per-gmem attributes MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260507-gmem-inplace-conversion-v6-19-91ab5a8b19a4@google.com> References: <20260507-gmem-inplace-conversion-v6-0-91ab5a8b19a4@google.com> In-Reply-To: <20260507-gmem-inplace-conversion-v6-0-91ab5a8b19a4@google.com> To: aik@amd.com, andrew.jones@linux.dev, binbin.wu@linux.intel.com, brauner@kernel.org, chao.p.peng@linux.intel.com, david@kernel.org, ira.weiny@intel.com, jmattson@google.com, jthoughton@google.com, michael.roth@amd.com, oupton@kernel.org, pankaj.gupta@amd.com, qperret@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, shivankg@amd.com, steven.price@arm.com, tabba@google.com, willy@infradead.org, wyihan@google.com, yan.y.zhao@intel.com, forkloop@google.com, pratyush@kernel.org, suzuki.poulose@arm.com, aneesh.kumar@kernel.org, liam@infradead.org, Paolo Bonzini , Sean Christopherson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , Shuah Khan , Vishal Annapurve , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Youngjun Park , Qi Zheng , Shakeel Butt , Kiryl Shutsemau , Jason Gunthorpe , Vlastimil Babka Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, Ackerley Tng X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1778185365; l=2855; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=C+ZXwAuQ/e98Rs7Di9G1EWrlq6zteRCZz2vi1AClkpI=; b=dp6jCn9ExgjqByTG7kaxpBbRNBGPX7nuFMLB6FJJWILEhdvQnCRngdmKGdljRH2+yoCeSw4BK Y/wktRb6O2yBOVvPb6wUEdVPY4MaXo1fd0+4WQ5Hw96ejsK19n6u44i X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Endpoint-Received: by B4 Relay for ackerleytng@google.com/20260225 with auth_id=649 X-Original-From: Ackerley Tng Reply-To: ackerleytng@google.com X-Stat-Signature: owyc39jn91gqaot3r14rm8pbpdrofqof X-Rspam-User: X-Rspamd-Queue-Id: A71C110000A X-Rspamd-Server: rspam07 X-HE-Tag: 1778185377-737801 X-HE-Meta: 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 7PjbtkHX zPjE82vjPRN2HLp6RioBtvXtIp1UY/K2kUhdrFbBQ2Xq8JLWDVSa5VsML/EJnLd+LKxIPd2H+kry4U/yLSYF4NtFDveVPStCehaQOWR1TgzBsY4YSnOR8hiVvmx42mdTIZZkCqyg4A42qOzuRXsd13Y/1pdgwX9N/fjkOE946poLXN0gtdg0ls/JtsT1Zm1goW1xq6JJecvBpnzH0dhW9PFMjlUIYQYbWXPYOgxB8o4/FDg5OaP/uIxfzdhhHOzgdL39W29yRjQBraRnnzcNf+ako3QyW6RK/4pnuJ/fVXr7rSQ9ZhdLYh/jWd4HEOiPTqqgcaEo/jl6Ue3i4FCzpExdGQ7+rWHbrIwlC0u+zLoyCElqomSHWArHNj8iWdKOPxCpIkWX12USDkejXZ5+3SfKB1q+DlrLcygCk Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Sean Christopherson Make vm_memory_attributes a module parameter so that userspace can disable the use of memory attributes on the VM level. To avoid inconsistencies in the way memory attributes are tracked in KVM and guest_memfd, the vm_memory_attributes module_param is made read-only (0444). Make CONFIG_KVM_VM_MEMORY_ATTRIBUTES selectable, only for (CoCo) VM types that might use vm_memory_attributes. Signed-off-by: Sean Christopherson Signed-off-by: Ackerley Tng --- arch/x86/kvm/Kconfig | 13 +++++++++---- virt/kvm/kvm_main.c | 1 + 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index b6d65ee664d0f..8b97d341bd33f 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -82,13 +82,20 @@ config KVM_WERROR config KVM_VM_MEMORY_ATTRIBUTES select KVM_MEMORY_ATTRIBUTES - bool + depends on KVM_SW_PROTECTED_VM || KVM_INTEL_TDX || KVM_AMD_SEV + bool "Enable per-VM memory attributes (for CoCo VMs)" + help + Enable support for per-VM memory attributes, which are deprecated in + favor of tracking memory attributes in guest_memfd. Select this if + you need to run CoCo VMs using a VMM that doesn't support guest_memfd + memory attributes. + + If unsure, say N. config KVM_SW_PROTECTED_VM bool "Enable support for KVM software-protected VMs" depends on EXPERT depends on KVM_X86 && X86_64 - select KVM_VM_MEMORY_ATTRIBUTES help Enable support for KVM software-protected VMs. Currently, software- protected VMs are purely a development and testing vehicle for @@ -139,7 +146,6 @@ config KVM_INTEL_TDX bool "Intel Trust Domain Extensions (TDX) support" default y depends on INTEL_TDX_HOST - select KVM_VM_MEMORY_ATTRIBUTES select HAVE_KVM_ARCH_GMEM_POPULATE help Provides support for launching Intel Trust Domain Extensions (TDX) @@ -163,7 +169,6 @@ config KVM_AMD_SEV depends on KVM_AMD && X86_64 depends on CRYPTO_DEV_SP_PSP && !(KVM_AMD=y && CRYPTO_DEV_CCP_DD=m) select ARCH_HAS_CC_PLATFORM - select KVM_VM_MEMORY_ATTRIBUTES select HAVE_KVM_ARCH_GMEM_PREPARE select HAVE_KVM_ARCH_GMEM_INVALIDATE select HAVE_KVM_ARCH_GMEM_POPULATE diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index cec02d68d7039..ba195bb239aaa 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -104,6 +104,7 @@ module_param(allow_unsafe_mappings, bool, 0444); #ifdef CONFIG_KVM_MEMORY_ATTRIBUTES #ifdef CONFIG_KVM_VM_MEMORY_ATTRIBUTES bool vm_memory_attributes = true; +module_param(vm_memory_attributes, bool, 0444); #endif DEFINE_STATIC_CALL_RET0(__kvm_get_memory_attributes, kvm_get_memory_attributes_t); EXPORT_SYMBOL_FOR_KVM_INTERNAL(STATIC_CALL_KEY(__kvm_get_memory_attributes)); -- 2.54.0.563.g4f69b47b94-goog