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X-CSE-ConnectionGUID: 4/1oeTyTTXqLw4m1L7ZMFQ== X-CSE-MsgGUID: YRwWCsuGTf+Sh86ZBrQcZg== X-IronPort-AV: E=McAfee;i="6800,10657,11832"; a="94676855" X-IronPort-AV: E=Sophos;i="6.24,233,1774335600"; d="scan'208";a="94676855" Received: from orviesa010.jf.intel.com ([10.64.159.150]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jun 2026 03:46:13 -0700 X-CSE-ConnectionGUID: kIS6WMq4Rfum65TODXoe7A== X-CSE-MsgGUID: q2IEDfAAQJKrOxUnJNZT+A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.24,233,1774335600"; d="scan'208";a="251179296" Received: from xiaoyaol-hp-g830.ccr.corp.intel.com (HELO [10.239.158.70]) ([10.239.158.70]) by orviesa010-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jun 2026 03:45:57 -0700 Message-ID: Date: Tue, 30 Jun 2026 18:45:54 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 03/46] KVM: Move KVM_VM_MEMORY_ATTRIBUTES config definition to x86 To: ackerleytng@google.com, 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, 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 , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Youngjun Park , Qi Zheng , Shakeel Butt , Kiryl Shutsemau , Baoquan He , 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 References: <20260618-gmem-inplace-conversion-v8-0-9d2959357853@google.com> <20260618-gmem-inplace-conversion-v8-3-9d2959357853@google.com> Content-Language: en-US From: Xiaoyao Li In-Reply-To: <20260618-gmem-inplace-conversion-v8-3-9d2959357853@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 0AFAB120003 X-Rspam-User: X-Stat-Signature: ehh1pq56yd79tpaosu4arf8pcwzhoag3 X-HE-Tag: 1782816378-780307 X-HE-Meta: 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 KsqSLXJL iEbuN/TVAo8oJuJ3pgLAcajLuu2TUyxVGUBzqvuniXjN0yAN/hFGcHXjo3ayMHWcF23+E3jEVekvkEX5GuU6eYHGZrmHLdmPula0tQA4pH4PypZ2u07I5s49hImdtwCfUYvT6dZiB9ZkomWNfJDKNh6jMsrgN32HOWDJkyffZbSpyIskDl61cBUgGZfLL0xcBRUz7y9uajWl6xdYJCOqCDjOxZ4j++Armbgoe0VKxa9e5z+KgQxEBR3/oX9/eDYuN7r5dZjybL1NLD5HFh/AbGWnsZZMUOv4/REokmonGF5CDRMU= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 6/19/2026 8:31 AM, Ackerley Tng via B4 Relay wrote: > 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 > Signed-off-by: Ackerley Tng Reviewed-by: Xiaoyao Li