From patchwork Wed Jul 8 16:19:04 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 6750051 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 4FE25C05AC for ; Wed, 8 Jul 2015 16:23:29 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 872342054A for ; Wed, 8 Jul 2015 16:23:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 98A6420546 for ; Wed, 8 Jul 2015 16:23:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759364AbbGHQTb (ORCPT ); Wed, 8 Jul 2015 12:19:31 -0400 Received: from foss.arm.com ([217.140.101.70]:42124 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758277AbbGHQTa (ORCPT ); Wed, 8 Jul 2015 12:19:30 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 48768317; Wed, 8 Jul 2015 09:19:56 -0700 (PDT) Received: from approximate.cambridge.arm.com (approximate.cambridge.arm.com [10.1.209.148]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EA3FE3F697; Wed, 8 Jul 2015 09:19:27 -0700 (PDT) From: Marc Zyngier To: Catalin Marinas , Will Deacon , Christoffer Dall Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Subject: [PATCH 01/13] arm/arm64: Add new is_kernel_in_hyp_mode predicate Date: Wed, 8 Jul 2015 17:19:04 +0100 Message-Id: <1436372356-30410-2-git-send-email-marc.zyngier@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1436372356-30410-1-git-send-email-marc.zyngier@arm.com> References: <1436372356-30410-1-git-send-email-marc.zyngier@arm.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-7.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP With ARMv8.1 VHE extension, it will be possible to run the kernel at EL2 (aka HYP mode). In order for the kernel to easily find out where it is running, add a new predicate that returns whether or not the kernel is in HYP mode. For completeness, the 32bit code also get such a predicate (always returning false) so that code common to both architecture (timers, KVM) can use it transparently. Signed-off-by: Marc Zyngier --- arch/arm/include/asm/virt.h | 5 +++++ arch/arm64/include/asm/virt.h | 10 ++++++++++ 2 files changed, 15 insertions(+) diff --git a/arch/arm/include/asm/virt.h b/arch/arm/include/asm/virt.h index 4371f45..b6a3cef 100644 --- a/arch/arm/include/asm/virt.h +++ b/arch/arm/include/asm/virt.h @@ -74,6 +74,11 @@ static inline bool is_hyp_mode_mismatched(void) { return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH); } + +static inline bool is_kernel_in_hyp_mode(void) +{ + return false; +} #endif #endif /* __ASSEMBLY__ */ diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h index 7a5df52..9f22dd6 100644 --- a/arch/arm64/include/asm/virt.h +++ b/arch/arm64/include/asm/virt.h @@ -23,6 +23,8 @@ #ifndef __ASSEMBLY__ +#include + /* * __boot_cpu_mode records what mode CPUs were booted in. * A correctly-implemented bootloader must start all CPUs in the same mode: @@ -50,6 +52,14 @@ static inline bool is_hyp_mode_mismatched(void) return __boot_cpu_mode[0] != __boot_cpu_mode[1]; } +static inline bool is_kernel_in_hyp_mode(void) +{ + u64 el; + + asm("mrs %0, CurrentEL" : "=r" (el)); + return el == CurrentEL_EL2; +} + /* The section containing the hypervisor text */ extern char __hyp_text_start[]; extern char __hyp_text_end[];