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 8EF1440096D; Thu, 16 Jul 2026 10:25:34 +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=1784197536; cv=none; b=k1lfKvVt8sguLMiCEpnz9tjO2Ozrm2wIMwv1TaEE0fjWQd0rhejdmLXR7YkdaMRORIZRnmjs3KdYn8H16hQG05Yo1ThUbg09x5yzci3uGYmZWDEm9RVtaDUD38qKoq4wJQNlo09Gh7zkBisy4hIz4jJwQ2mvWdUOeAQc6J81t3g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784197536; c=relaxed/simple; bh=x4kSnQlAgSYESyx9NTRUemd971Q4tXKjHfRBi5wLmcE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=QoBN7ci4od4BdbQAhBtMwQULWivsFc9CUkKx1qDUPb9U2maMWgD5TuUEFa0uXcoZ2JNWx6Crqnq9wvqUkmZeTT0P+h/oAXV6/jUl//9NDR2pSzo4FpDMTRBXVNsy0755Ttj4kG9Rl1seAn8oCKKp6j7YgXE486lEzBTXnvjy4j8= 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=ugV6FvcE; 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="ugV6FvcE" 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 B4FF7339; Thu, 16 Jul 2026 03:25:29 -0700 (PDT) Received: from [10.2.197.99] (ewhatever.cambridge.arm.com [10.2.197.99]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id A19343F7B4; Thu, 16 Jul 2026 03:25:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784197533; bh=x4kSnQlAgSYESyx9NTRUemd971Q4tXKjHfRBi5wLmcE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ugV6FvcEc/FYjqbDOiHKc2tk7abFU+2mIHkHx0gYYvAepIRtjAagEhuhyjLz+/bKJ dfjrntRzrd2GQXrp3HDJbFa9rFs20uE2B/NSCcuwVniqX7GO2XKkAHtUqAAJsgNDHm Ua3jezZGuS6XODMsGSxX3ix3GrTohLCQF0kJbYUM= Message-ID: <0a72c33d-0eb7-4cf2-b2c2-86e256740a63@arm.com> Date: Thu, 16 Jul 2026 11:25:28 +0100 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v15 17/37] KVM: arm64: Expose support for private memory To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , 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 References: <20260715142841.80544-1-steven.price@arm.com> <20260715142841.80544-18-steven.price@arm.com> Content-Language: en-US From: Suzuki K Poulose In-Reply-To: <20260715142841.80544-18-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 15/07/2026 15:28, Steven Price wrote: > Select KVM_GENERIC_MEMORY_ATTRIBUTES and provide the necessary support > functions. > > Signed-off-by: Steven Price > --- minor nit: Changes since v14: * Switch to guest_memfd in-place memory conversion and drop support for KVM_VM_MEMORY_ATTRIBUTES. Reviewed-by: Suzuki K Poulose > 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 9b46b39ed11e..993ead6e6449 100644 > --- a/arch/arm64/include/asm/kvm_host.h > +++ b/arch/arm64/include/asm/kvm_host.h > @@ -1509,6 +1509,8 @@ 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); >