From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 736E645A297; Fri, 7 Aug 2026 21:52:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786139568; cv=none; b=JGfovVNvr/q2+xlLNxerNw+hWS4bd90H1dNEWEqNW2LmikQaSB7u5HnCM5fCgyy16kG/PIay/dnpD9CizqywtIifAnM53lj8XNpUThcm3rFDG3HCBgbPOtJTg4H0SsXqkVO6CaWEEhWF2/onaKWdEY65XVzqNmJ6uG3Ra5YJ+GQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786139568; c=relaxed/simple; bh=CYny0H8G1T1w5+2Vn0HiiBpDYPh6AX3u7WawyvebPVg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Q3hYZWdBs75HvpuAT4guZZGkB5a9iUZg91/GsWvC1AifTSwP2Uvz8pYZyCyd7GYQQRxHvAeKHpCshaAbHbo/P/K49isIegvhp11k/EP4Q5KripyasX3rjjsUUabhnXLrBVTQSvtXljT0vXCU7e/P1bVAq7mfVFwzWkYtuZm4yxY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=r96v3Ova; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="r96v3Ova" Received: by smtp.kernel.org (Postfix) with ESMTPS id 2219FC2BD05; Fri, 7 Aug 2026 21:52:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1786139568; bh=CYny0H8G1T1w5+2Vn0HiiBpDYPh6AX3u7WawyvebPVg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=r96v3OvaH5RV5b/doFdmZHVxUc/gBza7+Wmv5pnL2TBpb06WKD/0aDNy/lqOIR/qX DWQhLiBz2yPL/ZXIZPLxq7jIa+aK2S3ofc3h8NZ8GrzTL4apjmluT/UqTnd90PWF2w MZX0uZi0dg7OCVL9WgUoA4oSsahPYO9sdU5kycw6MHvqXOybA4rYWrI0GSAqMyslvo KW8SX38Mm6VqvNOo62sEeuUVlH17XZxd15gqecCjbt6yw2KeVmgElDVYTWmcXJQikq 1E6zZPyVDrcvBpKWcCStpmwnFTYsU00e+oMUln1bgSXlXdEJEAjMLqh5Ic6Pkr3mDQ DpPHWgbysJjJA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id F2F1BC5ACD4; Fri, 7 Aug 2026 21:52:47 +0000 (UTC) From: Ackerley Tng via B4 Relay Date: Fri, 07 Aug 2026 14:52:43 -0700 Subject: [PATCH v10 04/41] KVM: Enumerate support for PRIVATE memory iff kvm_arch_has_private_mem is defined Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260807-gmem-inplace-conversion-v10-4-2fc18ee6d3ba@google.com> References: <20260807-gmem-inplace-conversion-v10-0-2fc18ee6d3ba@google.com> In-Reply-To: <20260807-gmem-inplace-conversion-v10-0-2fc18ee6d3ba@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, 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 , John Hubbard , Peter Xu , tarunsahu@google.com, Jason Gunthorpe , 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 X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1786139564; l=2340; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=lFRsujEsk43JmAvWcgvkvnyu0Lj39PjjRyBwxKpEywk=; b=grHE6Tsfr/GTzaFa3DypnMYU/6GjDXIIps37lx53+eCQ/JceF11Nx9OhYJqWN6hiC1v6rBqMQ p9UTgoF5KrMDwHPxXStn+EGP6DjqH7cyGTEklh93j3gHn0yv4HEbEPu 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 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 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 3e86cdd00e59b..e3666d0b40b74 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 e3a77d1e6d8ae..560ff05e95959 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; } -- 2.55.0.654.g21b8a5bc05-goog