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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" X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: A00A8C000B X-Stat-Signature: uwgj44ykzhszczrbucwsojkwq7prs6ih X-HE-Tag: 1787735926-479096 X-HE-Meta: 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 vDvW7ECZ 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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