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charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260830-gmem-inplace-conversion-v12-5-85e5fd25252a@google.com> References: <20260830-gmem-inplace-conversion-v12-0-85e5fd25252a@google.com> In-Reply-To: <20260830-gmem-inplace-conversion-v12-0-85e5fd25252a@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, 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, Randy Dunlap , Lorenzo Stoakes , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jason Gunthorpe , Fuad Tabba , Vlastimil Babka , Baoquan He 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 X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1788135915; l=2388; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=Npw45RhiuLmUU1MwINVjbSZRhJ+VqvMGA2O5ckbiMOE=; b=hcW6l//v6f2eUwZw8P7Qz727FIbcXf31OIfmzbJ/LOZhc5nkpROp8zwh5hMXWqpp7ERrejoqB F7AAbMsg+GBDHdwp37rBq/IND3M1JNVanBPieJM9VYyO2L3kDVkp0n3 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: 8shbcg7yaauq9fmhd355hqu66fo4zunj X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 492A9160003 X-Rspam-User: X-HE-Tag: 1788135922-733864 X-HE-Meta: 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 CLZQnXYQ 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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 Explicitly guard reporting support for KVM_MEMORY_ATTRIBUTE_PRIVATE based on kvm_arch_has_private_mem being #defined in anticipation of tracking PRIVATE vs. SHARED state per-guest_memfd, not per-VM (to allow in-place conversion). guest_memfd support for memory attributes is expected to be unconditional to avoid yet more macros (all architectures that support guest_memfd are expected to use per-gmem attributes at some point), at which point enumerating support KVM_MEMORY_ATTRIBUTE_PRIVATE based solely on memory attributes being supported by KVM at-large would result in a system-scope check (NULL @kvm) over-reporting support on arm64. Give architectures full control over overriding the default definition of kvm_arch_has_private_mem() by removing the coupling with CONFIG_KVM_VM_MEMORY_ATTRIBUTES. In a later patch, kvm_arch_has_private_mem() will be defined based on whether architectural features are compiled in, and made orthogonal to CONFIG_KVM_VM_MEMORY_ATTRIBUTES. Signed-off-by: Sean Christopherson Reviewed-by: Fuad Tabba Reviewed-by: Binbin Wu Tested-by: Shivank Garg Reviewed-by: Xiaoyao Li Signed-off-by: Ackerley Tng --- include/linux/kvm_host.h | 2 +- virt/kvm/kvm_main.c | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index cffa16647f2ab..b45fb80b0aca0 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -722,7 +722,7 @@ static inline int kvm_arch_vcpu_memslots_id(struct kvm_vcpu *vcpu) } #endif -#ifndef CONFIG_KVM_VM_MEMORY_ATTRIBUTES +#ifndef kvm_arch_has_private_mem static inline bool kvm_arch_has_private_mem(struct kvm *kvm) { return false; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7d5325e3cb44b..050757544a1cb 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2422,8 +2422,10 @@ static int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm, #ifdef CONFIG_KVM_VM_MEMORY_ATTRIBUTES static u64 kvm_supported_mem_attributes(struct kvm *kvm) { +#ifdef kvm_arch_has_private_mem if (!kvm || kvm_arch_has_private_mem(kvm)) return KVM_MEMORY_ATTRIBUTE_PRIVATE; +#endif return 0; } -- 2.55.0.897.gb25b4bd76c-goog