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a=ed25519-sha256; t=1787735885; l=2388; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=ogSExkBJJQ0shJgqMiTFGyZ7TdxK9ZVCrr3NofP4mmE=; b=1VX8N8uXNhbB64TEP35V6sDoTKXKwmyT3n8b5as3eYzSda3HxQRMrx3iH9t7mWRMGk60IOhnx 3126PLKu+/IAhStJ/lCMVD5ke3zv0gqVMqqbPje0NlXfe+BE1kamZ5b X-Mailer: b4 0.16.0 Message-ID: <20260826-gmem-inplace-conversion-v11-5-0a15d8a799aa@google.com> Subject: [PATCH v11 05/46] KVM: Enumerate support for PRIVATE memory iff kvm_arch_has_private_mem is defined 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 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; } -- 2.55.0.887.g758fc8c411-goog