From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 80A4C419302; Mon, 3 Aug 2026 13:46:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785764771; cv=none; b=UnR3Qs+Hp+tri6Up95XwRGG7RB+FiHeNVTDAkYYgEPM9yUhDcvZs+/NLBnUAMCFXVIfqNDNZuD7hv9HNBFGtdqRXzFrRr67LtXyR832g1z0oQnnvwS9w/2nY+wOeczRyzQ4gDnO/e5To52bjnLUS+TCGi7avt4/HgKe+K4+EldI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785764771; c=relaxed/simple; bh=CzDXgxOuepxzu+QGvZRaCZEmtV4jtA47VV79b/Le9OU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RfuzhBxBLC2NWgBnn4FJLaWuG4uFoe7omsUvtrQS0Rsn+Jq8RS8kqF6jRw/Ik0tri7semkyufOgeojFZZZ9B/BfkHgqjPGZ/twmlT9OkswuKAj/qxohB1nZR78YCi7I+5FqPwHmmFEqid4n9jH7WD4J6eHDjRe0ufPl3bzwUjDM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=NYqxGDxy; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="NYqxGDxy" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B87191655; Mon, 3 Aug 2026 06:46:05 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.25.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id CF2AB3F66F; Mon, 3 Aug 2026 06:46:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1785764769; bh=CzDXgxOuepxzu+QGvZRaCZEmtV4jtA47VV79b/Le9OU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NYqxGDxysx6UdyDzvxP/Xv5joe9UD6endoboLrwwEK1v+Rf39naqjpmrJacfzmPnz MfV/rAtSkaj1j6ke0cqNbWX6msfj067eDNiXuvILizBUH5nLQXeaiO+Xlw4aMbI3v9 Jri+KHjpNBec5BJgL5FI76wASDvQfgwBg6BRMqoI= From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Emi Kisanuki , Vishal Annapurve , WeiLin.Chang@arm.com, Lorenzo Pieralisi Subject: [PATCH v16 24/45] KVM: arm64: Expose support for private memory Date: Mon, 3 Aug 2026 14:43:40 +0100 Message-ID: <20260803134403.80630-25-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260803134403.80630-1-steven.price@arm.com> References: <20260803134403.80630-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Select KVM_GENERIC_MEMORY_ATTRIBUTES and provide the necessary support functions. Reviewed-by: Suzuki K Poulose Signed-off-by: Steven Price --- Changes since v14: * Switch to guest_memfd in-place memory conversion and drop support for KVM_VM_MEMORY_ATTRIBUTES. Changes since v13: * Also update documentation to show that KVM_CAP_MEMORY_ATTRIBUTES is used on arm64. Changes since v12: * Only define kvm_arch_has_private_mem() when CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES is set to avoid build issues when KVM is disabled. Changes since v10: * KVM_GENERIC_PRIVATE_MEM replacd with KVM_GENERIC_MEMORY_ATTRIBUTES. Changes since v9: * Drop the #ifdef CONFIG_KVM_PRIVATE_MEM guard from the definition of kvm_arch_has_private_mem() Changes since v2: * Switch kvm_arch_has_private_mem() to a macro to avoid overhead of a function call. * Guard definitions of kvm_arch_{pre,post}_set_memory_attributes() with #ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES. * Early out in kvm_arch_post_set_memory_attributes() if the WARN_ON should trigger. --- arch/arm64/include/asm/kvm_host.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 15d42d1993bb..146c52f867c0 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -1510,6 +1510,8 @@ struct kvm *kvm_arch_alloc_vm(void); #define vcpu_is_protected(vcpu) kvm_vm_is_protected((vcpu)->kvm) +#define kvm_arch_has_private_mem(kvm) ((kvm)->arch.is_realm) + int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature); bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu); -- 2.43.0