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AJvYcCUEWh21NwDC5WzInmcgHvRacH4ff+G9+6+y7zwMV0dTX9i+lL5NimfSg8pBIyYPry/jaVSxu/YysFxm39A=@vger.kernel.org X-Gm-Message-State: AOJu0YwNJy/007t8tZDzfUoeEaznezWK04o14s/3RCdH55YdQnXPGpC/ 8mHbObDlYkNuUB/Uv5DuztvwHPxSIw6mhkEZ2cUL/WxoPDeWGOArStAyV1ovjlt/CBhdlCSEivI g/Ano0adLMXnv87UFCV4pNNcIDg== X-Received: from pga10.prod.google.com ([2002:a05:6a02:4f8a:b0:c6e:1954:345]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:4ad0:b0:35b:e594:5038 with SMTP id 98e67ed59e1d1-35c300b7e5amr211045a91.17.1774563897304; Thu, 26 Mar 2026 15:24:57 -0700 (PDT) Date: Thu, 26 Mar 2026 15:24:25 -0700 In-Reply-To: <20260326-gmem-inplace-conversion-v4-0-e202fe950ffd@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260326-gmem-inplace-conversion-v4-0-e202fe950ffd@google.com> X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Developer-Signature: v=1; a=ed25519-sha256; t=1774563861; l=1752; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=eWTeX+992GeYO26dNFWGC344Wuak8bbQzmW7qdSnDKw=; b=SL6pYdxlhvPJikdSi+mQfL/6DG+UDH5L2C4BN1AeU1jYKBkDwTYhcD1AK0H3INZXB0ml7c0AA j3kIXGoRZuyCSKk9sI3NBJpxVzzQomxNO1Xr6/eqMY1cnRkZkNjdzmW X-Mailer: b4 0.14.3 Message-ID: <20260326-gmem-inplace-conversion-v4-16-e202fe950ffd@google.com> Subject: [PATCH RFC v4 16/44] 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, ira.weiny@intel.com, jmattson@google.com, jroedel@suse.de, 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, 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 , 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, Ackerley Tng Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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 no other memory attributes are on the horizon. 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 support memory attributes, 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 --- arch/x86/kvm/Kconfig | 4 ++++ virt/kvm/Kconfig | 4 ---- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 26f6afd51bbdc..b6d65ee664d0f 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -80,6 +80,10 @@ config KVM_WERROR =20 If in doubt, say "N". =20 +config KVM_VM_MEMORY_ATTRIBUTES + select KVM_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 e371e079e2c50..663de6421eda2 100644 --- a/virt/kvm/Kconfig +++ b/virt/kvm/Kconfig @@ -103,10 +103,6 @@ config KVM_MMU_LOCKLESS_AGING config KVM_MEMORY_ATTRIBUTES bool =20 -config KVM_VM_MEMORY_ATTRIBUTES - select KVM_MEMORY_ATTRIBUTES - bool - config KVM_GUEST_MEMFD select XARRAY_MULTI select KVM_MEMORY_ATTRIBUTES --=20 2.53.0.1018.g2bb0e51243-goog