From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by smtp.lore.kernel.org (Postfix) with ESMTP id CDF67C433F5 for ; Thu, 19 May 2022 13:48:21 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 770384B4D0; Thu, 19 May 2022 09:48:21 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@kernel.org Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 44fMe26sGPyP; Thu, 19 May 2022 09:48:19 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 3DCCD4B4CC; Thu, 19 May 2022 09:48:19 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 3AB354B4DF for ; Thu, 19 May 2022 09:48:18 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EqcWYAW-fw3k for ; Thu, 19 May 2022 09:48:17 -0400 (EDT) Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 57CF04B4C8 for ; Thu, 19 May 2022 09:48:16 -0400 (EDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 8BB33B824AB; Thu, 19 May 2022 13:48:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA3E8C34116; Thu, 19 May 2022 13:48:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652968094; bh=yfv/vQKADWjGkdBJvYkXwUJ0o4vv6c5SpCbBBPRGgJ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=enJFxxMLTdCW1oDtkbsEEik4y7sHN9Bev+iph2vEztvwtIMBc8d1+tbGlXB8quSpT UL2qz4FhDigx3GQig5rWvxsVwLdbMi6wKOzZ/NCW/0jkQwtTpTaxawnSkOa20oOorA wYKhGCD5N+iJq73s8m+s3PqHFb3HZ8oevAhX7T+QRhsRS4FxAxPWG6PebGOhrKXqc2 7zRBSaoCSJbRRQwz18nrpYH/qLrdBYYo2qq9A00PUrT5nvoN+0VOLrEvTScBhAMdZS nJ1nQKRgPxOC3qQ6EI0XALxal/qEMkfEUUT4LjIgKl2ZAWmodutx8VrYZT/wZdHbcv maBd7eqbeoo/g== From: Will Deacon To: kvmarm@lists.cs.columbia.edu Subject: [PATCH 88/89] KVM: arm64: Introduce KVM_VM_TYPE_ARM_PROTECTED machine type for PVMs Date: Thu, 19 May 2022 14:42:03 +0100 Message-Id: <20220519134204.5379-89-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220519134204.5379-1-will@kernel.org> References: <20220519134204.5379-1-will@kernel.org> MIME-Version: 1.0 Cc: Marc Zyngier , kernel-team@android.com, kvm@vger.kernel.org, Andy Lutomirski , linux-arm-kernel@lists.infradead.org, Michael Roth , Catalin Marinas , Chao Peng , Will Deacon X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Introduce a new virtual machine type, KVM_VM_TYPE_ARM_PROTECTED, which specifies that the guest memory pages are to be unmapped from the host stage-2 by the hypervisor. Signed-off-by: Will Deacon --- arch/arm64/include/asm/kvm_pkvm.h | 2 +- arch/arm64/kvm/arm.c | 5 ++++- arch/arm64/kvm/mmu.c | 3 --- arch/arm64/kvm/pkvm.c | 10 +++++++++- include/uapi/linux/kvm.h | 6 ++++++ 5 files changed, 20 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h index 062ae2ffbdfb..952e3c3fa32d 100644 --- a/arch/arm64/include/asm/kvm_pkvm.h +++ b/arch/arm64/include/asm/kvm_pkvm.h @@ -16,7 +16,7 @@ #define HYP_MEMBLOCK_REGIONS 128 -int kvm_init_pvm(struct kvm *kvm); +int kvm_init_pvm(struct kvm *kvm, unsigned long type); int kvm_shadow_create(struct kvm *kvm); void kvm_shadow_destroy(struct kvm *kvm); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 9c5a935a9a73..26fd69727c81 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -141,11 +141,14 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) { int ret; + if (type & ~KVM_VM_TYPE_MASK) + return -EINVAL; + ret = kvm_share_hyp(kvm, kvm + 1); if (ret) return ret; - ret = kvm_init_pvm(kvm); + ret = kvm_init_pvm(kvm, type); if (ret) goto err_unshare_kvm; diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 137d4382ed1c..392ff7b2362d 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -652,9 +652,6 @@ int kvm_init_stage2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu, unsigned long t u64 mmfr0, mmfr1; u32 phys_shift; - if (type & ~KVM_VM_TYPE_ARM_IPA_SIZE_MASK) - return -EINVAL; - phys_shift = KVM_VM_TYPE_ARM_IPA_SIZE(type); if (is_protected_kvm_enabled()) { phys_shift = kvm_ipa_limit; diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c index 67aad91dc3e5..ebf93ff6a77e 100644 --- a/arch/arm64/kvm/pkvm.c +++ b/arch/arm64/kvm/pkvm.c @@ -218,8 +218,16 @@ void kvm_shadow_destroy(struct kvm *kvm) } } -int kvm_init_pvm(struct kvm *kvm) +int kvm_init_pvm(struct kvm *kvm, unsigned long type) { mutex_init(&kvm->arch.pkvm.shadow_lock); + + if (!(type & KVM_VM_TYPE_ARM_PROTECTED)) + return 0; + + if (!is_protected_kvm_enabled()) + return -EINVAL; + + kvm->arch.pkvm.enabled = true; return 0; } diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 91a6fe4e02c0..fdb0289cfecc 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -887,6 +887,12 @@ struct kvm_ppc_resize_hpt { #define KVM_VM_TYPE_ARM_IPA_SIZE_MASK 0xffULL #define KVM_VM_TYPE_ARM_IPA_SIZE(x) \ ((x) & KVM_VM_TYPE_ARM_IPA_SIZE_MASK) + +#define KVM_VM_TYPE_ARM_PROTECTED (1UL << 8) + +#define KVM_VM_TYPE_MASK (KVM_VM_TYPE_ARM_IPA_SIZE_MASK | \ + KVM_VM_TYPE_ARM_PROTECTED) + /* * ioctls for /dev/kvm fds: */ -- 2.36.1.124.g0e6072fb45-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF8D4C43217 for ; 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d=kernel.org; s=k20201202; t=1652968094; bh=yfv/vQKADWjGkdBJvYkXwUJ0o4vv6c5SpCbBBPRGgJ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=enJFxxMLTdCW1oDtkbsEEik4y7sHN9Bev+iph2vEztvwtIMBc8d1+tbGlXB8quSpT UL2qz4FhDigx3GQig5rWvxsVwLdbMi6wKOzZ/NCW/0jkQwtTpTaxawnSkOa20oOorA wYKhGCD5N+iJq73s8m+s3PqHFb3HZ8oevAhX7T+QRhsRS4FxAxPWG6PebGOhrKXqc2 7zRBSaoCSJbRRQwz18nrpYH/qLrdBYYo2qq9A00PUrT5nvoN+0VOLrEvTScBhAMdZS nJ1nQKRgPxOC3qQ6EI0XALxal/qEMkfEUUT4LjIgKl2ZAWmodutx8VrYZT/wZdHbcv maBd7eqbeoo/g== From: Will Deacon To: kvmarm@lists.cs.columbia.edu Cc: Will Deacon , Ard Biesheuvel , Sean Christopherson , Alexandru Elisei , Andy Lutomirski , Catalin Marinas , James Morse , Chao Peng , Quentin Perret , Suzuki K Poulose , Michael Roth , Mark Rutland , Fuad Tabba , Oliver Upton , Marc Zyngier , kernel-team@android.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 88/89] KVM: arm64: Introduce KVM_VM_TYPE_ARM_PROTECTED machine type for PVMs Date: Thu, 19 May 2022 14:42:03 +0100 Message-Id: <20220519134204.5379-89-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220519134204.5379-1-will@kernel.org> References: <20220519134204.5379-1-will@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Introduce a new virtual machine type, KVM_VM_TYPE_ARM_PROTECTED, which specifies that the guest memory pages are to be unmapped from the host stage-2 by the hypervisor. Signed-off-by: Will Deacon --- arch/arm64/include/asm/kvm_pkvm.h | 2 +- arch/arm64/kvm/arm.c | 5 ++++- arch/arm64/kvm/mmu.c | 3 --- arch/arm64/kvm/pkvm.c | 10 +++++++++- include/uapi/linux/kvm.h | 6 ++++++ 5 files changed, 20 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h index 062ae2ffbdfb..952e3c3fa32d 100644 --- a/arch/arm64/include/asm/kvm_pkvm.h +++ b/arch/arm64/include/asm/kvm_pkvm.h @@ -16,7 +16,7 @@ #define HYP_MEMBLOCK_REGIONS 128 -int kvm_init_pvm(struct kvm *kvm); +int kvm_init_pvm(struct kvm *kvm, unsigned long type); int kvm_shadow_create(struct kvm *kvm); void kvm_shadow_destroy(struct kvm *kvm); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 9c5a935a9a73..26fd69727c81 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -141,11 +141,14 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) { int ret; + if (type & ~KVM_VM_TYPE_MASK) + return -EINVAL; + ret = kvm_share_hyp(kvm, kvm + 1); if (ret) return ret; - ret = kvm_init_pvm(kvm); + ret = kvm_init_pvm(kvm, type); if (ret) goto err_unshare_kvm; diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 137d4382ed1c..392ff7b2362d 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -652,9 +652,6 @@ int kvm_init_stage2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu, unsigned long t u64 mmfr0, mmfr1; u32 phys_shift; - if (type & ~KVM_VM_TYPE_ARM_IPA_SIZE_MASK) - return -EINVAL; - phys_shift = KVM_VM_TYPE_ARM_IPA_SIZE(type); if (is_protected_kvm_enabled()) { phys_shift = kvm_ipa_limit; diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c index 67aad91dc3e5..ebf93ff6a77e 100644 --- a/arch/arm64/kvm/pkvm.c +++ b/arch/arm64/kvm/pkvm.c @@ -218,8 +218,16 @@ void kvm_shadow_destroy(struct kvm *kvm) } } -int kvm_init_pvm(struct kvm *kvm) +int kvm_init_pvm(struct kvm *kvm, unsigned long type) { mutex_init(&kvm->arch.pkvm.shadow_lock); + + if (!(type & KVM_VM_TYPE_ARM_PROTECTED)) + return 0; + + if (!is_protected_kvm_enabled()) + return -EINVAL; + + kvm->arch.pkvm.enabled = true; return 0; } diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 91a6fe4e02c0..fdb0289cfecc 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -887,6 +887,12 @@ struct kvm_ppc_resize_hpt { #define KVM_VM_TYPE_ARM_IPA_SIZE_MASK 0xffULL #define KVM_VM_TYPE_ARM_IPA_SIZE(x) \ ((x) & KVM_VM_TYPE_ARM_IPA_SIZE_MASK) + +#define KVM_VM_TYPE_ARM_PROTECTED (1UL << 8) + +#define KVM_VM_TYPE_MASK (KVM_VM_TYPE_ARM_IPA_SIZE_MASK | \ + KVM_VM_TYPE_ARM_PROTECTED) + /* * ioctls for /dev/kvm fds: */ -- 2.36.1.124.g0e6072fb45-goog From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 414FDC433EF for ; Thu, 19 May 2022 14:52:04 +0000 (UTC) DKIM-Signature: v=1; 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Thu, 19 May 2022 13:48:19 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 8BB33B824AB; Thu, 19 May 2022 13:48:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA3E8C34116; Thu, 19 May 2022 13:48:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652968094; bh=yfv/vQKADWjGkdBJvYkXwUJ0o4vv6c5SpCbBBPRGgJ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=enJFxxMLTdCW1oDtkbsEEik4y7sHN9Bev+iph2vEztvwtIMBc8d1+tbGlXB8quSpT UL2qz4FhDigx3GQig5rWvxsVwLdbMi6wKOzZ/NCW/0jkQwtTpTaxawnSkOa20oOorA wYKhGCD5N+iJq73s8m+s3PqHFb3HZ8oevAhX7T+QRhsRS4FxAxPWG6PebGOhrKXqc2 7zRBSaoCSJbRRQwz18nrpYH/qLrdBYYo2qq9A00PUrT5nvoN+0VOLrEvTScBhAMdZS nJ1nQKRgPxOC3qQ6EI0XALxal/qEMkfEUUT4LjIgKl2ZAWmodutx8VrYZT/wZdHbcv maBd7eqbeoo/g== From: Will Deacon To: kvmarm@lists.cs.columbia.edu Cc: Will Deacon , Ard Biesheuvel , Sean Christopherson , Alexandru Elisei , Andy Lutomirski , Catalin Marinas , James Morse , Chao Peng , Quentin Perret , Suzuki K Poulose , Michael Roth , Mark Rutland , Fuad Tabba , Oliver Upton , Marc Zyngier , kernel-team@android.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 88/89] KVM: arm64: Introduce KVM_VM_TYPE_ARM_PROTECTED machine type for PVMs Date: Thu, 19 May 2022 14:42:03 +0100 Message-Id: <20220519134204.5379-89-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220519134204.5379-1-will@kernel.org> References: <20220519134204.5379-1-will@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220519_064817_504154_A057FC66 X-CRM114-Status: GOOD ( 17.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Introduce a new virtual machine type, KVM_VM_TYPE_ARM_PROTECTED, which specifies that the guest memory pages are to be unmapped from the host stage-2 by the hypervisor. Signed-off-by: Will Deacon --- arch/arm64/include/asm/kvm_pkvm.h | 2 +- arch/arm64/kvm/arm.c | 5 ++++- arch/arm64/kvm/mmu.c | 3 --- arch/arm64/kvm/pkvm.c | 10 +++++++++- include/uapi/linux/kvm.h | 6 ++++++ 5 files changed, 20 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h index 062ae2ffbdfb..952e3c3fa32d 100644 --- a/arch/arm64/include/asm/kvm_pkvm.h +++ b/arch/arm64/include/asm/kvm_pkvm.h @@ -16,7 +16,7 @@ #define HYP_MEMBLOCK_REGIONS 128 -int kvm_init_pvm(struct kvm *kvm); +int kvm_init_pvm(struct kvm *kvm, unsigned long type); int kvm_shadow_create(struct kvm *kvm); void kvm_shadow_destroy(struct kvm *kvm); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 9c5a935a9a73..26fd69727c81 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -141,11 +141,14 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) { int ret; + if (type & ~KVM_VM_TYPE_MASK) + return -EINVAL; + ret = kvm_share_hyp(kvm, kvm + 1); if (ret) return ret; - ret = kvm_init_pvm(kvm); + ret = kvm_init_pvm(kvm, type); if (ret) goto err_unshare_kvm; diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 137d4382ed1c..392ff7b2362d 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -652,9 +652,6 @@ int kvm_init_stage2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu, unsigned long t u64 mmfr0, mmfr1; u32 phys_shift; - if (type & ~KVM_VM_TYPE_ARM_IPA_SIZE_MASK) - return -EINVAL; - phys_shift = KVM_VM_TYPE_ARM_IPA_SIZE(type); if (is_protected_kvm_enabled()) { phys_shift = kvm_ipa_limit; diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c index 67aad91dc3e5..ebf93ff6a77e 100644 --- a/arch/arm64/kvm/pkvm.c +++ b/arch/arm64/kvm/pkvm.c @@ -218,8 +218,16 @@ void kvm_shadow_destroy(struct kvm *kvm) } } -int kvm_init_pvm(struct kvm *kvm) +int kvm_init_pvm(struct kvm *kvm, unsigned long type) { mutex_init(&kvm->arch.pkvm.shadow_lock); + + if (!(type & KVM_VM_TYPE_ARM_PROTECTED)) + return 0; + + if (!is_protected_kvm_enabled()) + return -EINVAL; + + kvm->arch.pkvm.enabled = true; return 0; } diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 91a6fe4e02c0..fdb0289cfecc 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -887,6 +887,12 @@ struct kvm_ppc_resize_hpt { #define KVM_VM_TYPE_ARM_IPA_SIZE_MASK 0xffULL #define KVM_VM_TYPE_ARM_IPA_SIZE(x) \ ((x) & KVM_VM_TYPE_ARM_IPA_SIZE_MASK) + +#define KVM_VM_TYPE_ARM_PROTECTED (1UL << 8) + +#define KVM_VM_TYPE_MASK (KVM_VM_TYPE_ARM_IPA_SIZE_MASK | \ + KVM_VM_TYPE_ARM_PROTECTED) + /* * ioctls for /dev/kvm fds: */ -- 2.36.1.124.g0e6072fb45-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel