From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f199.google.com (mail-pl1-f199.google.com [209.85.214.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 297B03DBD54 for ; Wed, 26 Aug 2026 09:18:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787735936; cv=none; b=SH40LGPqLGIaPq1cvDTGXDjLCcLbbmKT3WH2GEnlCa2Xz3M8JIFcN/09UIQBl2xirDfoiXe9aSzqliUYCyQLqAJf83uFlUnHLRmaBF05nJliMdJCl/13o8eTvRNPtUREXTXPavGDO0kj6O6OQxGIvKpf2K6MoaEm1pICzUpXqco= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787735936; c=relaxed/simple; bh=coen2YTr1jMY7N8jgQMR4KIO1rvqehu9jtUhjuViG0w=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=fsYEXVjUcXBk5XFUgxvk8LCVrkFhPDlY5NVnHwE3rDG3Mui5n1wxTZ9QOUXLxVXicxLnjUeLomsc7LqsVITGJ+o/t3M84GrnHZOtlt3CTVRJvB2mWO6L7rcmKXft8wB/jEOEFpVf1tUEPpwgLDTQqf8OqrwIjxomage7PW+QTS8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--ackerleytng.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=jn5GEqq+; arc=none smtp.client-ip=209.85.214.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--ackerleytng.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="jn5GEqq+" Received: by mail-pl1-f199.google.com with SMTP id d9443c01a7336-2cee894b3d8so13666375ad.2 for ; Wed, 26 Aug 2026 02:18:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1787735925; x=1788340725; darn=lists.linux.dev; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=1PoPcctCxCU9xeD6IUV2UNVUEFjzWLV4ASul8wcFVUE=; b=jn5GEqq+ksz1Hi5qYRHsW/YRuFmkWw5OfTEwGu+yu1CM9+Fixj0rQgxbkESJh2qeyM ggIHFEOOp+EEGgzDpVc4QyAYFxnGww5k5MveJs70yYI+lQMEIDgE0Cw29ffH//060ayn FxqFu1qJn4YWnzK3f7CsZKsHjFIOCQezay/+tnC4/Knak/sP0Xc8NmWBlLV+vbxnBLct giretk78F53GIBda5KGxVWo5B3m3C142woYAHIhBISePguy0ushJq8n6iv65bq1lozkK bFipVBtlYTZOJuRdJgan70kk2C8BXq/ckAQCp19f4YbAbWCRBqxMs5OoBQyoVKWtElLf ceHQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787735925; x=1788340725; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=1PoPcctCxCU9xeD6IUV2UNVUEFjzWLV4ASul8wcFVUE=; b=pakmBIcrbaM7FWY5Lo2pOPpn6PleRcuDZSsEmg+rt5lEhiE3rn4IMX3lUoEvrG0uS2 rKpGyH5INR5Iu8IA4r/q6Ede74ViWSbLrlKbOeOXLOW+fpUR/h3yfv6LoJ68SCltqKnh M9CEmfEN3UucKf1jsMt/W9s8sAmLh1pmSrs2ge4fOEMzIbd01z6vap5m50/NcbsGMDAS Jd6hV4l3OoBpOEn2QJgkchl4NVcIcCoC1ktimJtx4wnQsOpDF/t40QOK5S4uiih+bM4G nyD7C+hbprX6yVqaMJ/L6xCIWt8umMTRTfX6141XUF0Nk1JT/QkKtaJjUxFrOKPJdOg4 xheQ== X-Forwarded-Encrypted: i=1; AHgh+Ro4sOJoPzFirKNxCH7VHtcqIr1pCmWzGvf3M83Tkd+zLyoybcWGz7Gxg/07sLEkKymUJOnEPQgzfrrB@lists.linux.dev X-Gm-Message-State: AFuF++kntjhjf5Ar+IriuweQhXqy/0f8xrjTSWiUQ8A5ubV/UtfjVprV BU30vs6/hE2/ZTX2EOLsDSLgvhzWLlTbjKoQBlpmsH1sVgm+atmHhZoSYPFtOTiobXs9RWynlGV scYsabjm6x5vHY4i35A44k6k1qA== X-Received: from plri12.prod.google.com ([2002:a17:903:32cc:b0:2cc:7709:3bc8]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:1a45:b0:2cc:d6de:d597 with SMTP id d9443c01a7336-2d707a9fecbmr93422125ad.7.1787735924909; Wed, 26 Aug 2026 02:18:44 -0700 (PDT) Date: Wed, 26 Aug 2026 09:18:20 +0000 In-Reply-To: <20260826-gmem-inplace-conversion-v11-0-0a15d8a799aa@google.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260826-gmem-inplace-conversion-v11-0-0a15d8a799aa@google.com> X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Developer-Signature: v=1; a=ed25519-sha256; t=1787735885; l=2002; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=5+fsxDOXBXvxtjSmr4LTesZGOQ7aAAqTF+3X7TBXdZA=; b=Rx5ixHeP0JEHh6BXcEuohPdB+7Rs9tkd/Cq94uHcIXinftxcsawhYkswrSTC+BPLDcx78kRwU vASNv9iu4SlANU6cEaBK5QarVqaCef2nf28MCtJrwSE8k7ohH/iAF11 X-Mailer: b4 0.16.0 Message-ID: <20260826-gmem-inplace-conversion-v11-22-0a15d8a799aa@google.com> Subject: [PATCH v11 22/46] KVM: Move KVM_VM_MEMORY_ATTRIBUTES config definition to x86 From: Ackerley Tng 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, 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, 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 , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Youngjun Park , Qi Zheng , Shakeel Butt , Kiryl Shutsemau , Baoquan He , Jason Gunthorpe , John Hubbard , Peter Xu , tarunsahu@google.com, Fuad Tabba , 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 , Xiaoyao Li Content-Type: text/plain; charset="utf-8" From: Sean Christopherson Bury KVM_VM_MEMORY_ATTRIBUTES in x86 to discourage other architectures from adding support for per-VM memory attributes, because tracking private vs. shared memory on a per-VM basis is now deprecated in favor of tracking on a per-guest_memfd basis, and while RWX memory attributes are on the horizon, they too are expected to be x86-only. This will also allow modifying KVM_VM_MEMORY_ATTRIBUTES to be user-selectable (in x86) without creating weirdness in KVM's Kconfigs. Now that guest_memfd supports in-place conversions, it's entirely possible to run x86 CoCo VMs without support for KVM_VM_MEMORY_ATTRIBUTES. Leave the code itself in common KVM so that it's trivial to undo this change if new per-VM attributes do come along. Signed-off-by: Sean Christopherson Reviewed-by: Fuad Tabba Reviewed-by: Xiaoyao Li Reviewed-by: Binbin Wu Tested-by: Shivank Garg Reviewed-by: David Hildenbrand (Arm) Signed-off-by: Ackerley Tng --- arch/x86/kvm/Kconfig | 3 +++ virt/kvm/Kconfig | 3 --- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 2f8e1b5a8a72c..abb108886733a 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -80,6 +80,9 @@ config KVM_WERROR If in doubt, say "N". +config KVM_VM_MEMORY_ATTRIBUTES + bool + config KVM_SW_PROTECTED_VM bool "Enable support for KVM software-protected VMs" depends on EXPERT diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig index df575449d97b5..a0678ef8ee3f5 100644 --- a/virt/kvm/Kconfig +++ b/virt/kvm/Kconfig @@ -100,9 +100,6 @@ config KVM_ELIDE_TLB_FLUSH_IF_YOUNG config KVM_MMU_LOCKLESS_AGING bool -config KVM_VM_MEMORY_ATTRIBUTES - bool - config KVM_GUEST_MEMFD select XARRAY_MULTI bool -- 2.55.0.887.g758fc8c411-goog