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 00185C433EF for ; Thu, 21 Jul 2022 05:58:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231477AbiGUF6K (ORCPT ); Thu, 21 Jul 2022 01:58:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46740 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231309AbiGUF6D (ORCPT ); Thu, 21 Jul 2022 01:58:03 -0400 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C27C279EED for ; Wed, 20 Jul 2022 22:57:58 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-2eb7d137101so6650067b3.12 for ; Wed, 20 Jul 2022 22:57:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=/uwhBcl2d0wd6dxTVJiUUqJSQ7KfqpT1oTO144kMEdg=; b=BWqTOdX0ZIZ5zMm9VbYz1xMo06XHQHmhBqBdZFqXLyASFYZjsNE0fFUJrAsotKVH2h XJ7hnW52HME2xg7ReZn6rVjK2osnE0jb/K5QlqNipgjkKtb2cl59Qo9j03gCasGmJ1Dz juzPZNdDyUki1Nl7gMr8C8xcc3zmItqQLlBdzUKbzgx6Z9BCZggI7WpumSn2X8NpsikN Al4RWHWjPLmEgPPSEw4HJe4fxQeNejE3gTySW3+FilDGT5zBLX4fkZKiY/WCg2vsjjZI 20fJzOdm9yjBIiPMnknkrQIGVupnOa68FqKEeobAjDieK1E+aWmxh3/BRiXSRfNAKWLp etqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=/uwhBcl2d0wd6dxTVJiUUqJSQ7KfqpT1oTO144kMEdg=; b=sj4kZCRYNb1lWIfjkvLFf5MZg5CpIKAMm3xeB8F2mN5OjqHUBR73B4Jtp5emFDvZ7p 0WCGJrgECt9txpvGf9MlYYr8GYGg1Ql//d8/03FJ1F+Tv6h4dB+VaiTIhrY6iMKAjQCu VmWh+9sXhIyUn+2TSijgMhp4iRa3KvNXiB8aEQ/uC7biDWmvxqbTkJ0RsTXCTkK2IJ1n rfdABFSdeH/yHGXNtwwPxWs3JOWFq/Mm1aXulDbnOCNut7XvkDFyrl3Ta/Q5sEfH9Rx4 AaHV06mf2BC+x2iI4Y+LdBEx8aIzZ7zBrJI5LneiHIADidYoNpWu/IriaN0A3/gwBpVl GOpA== X-Gm-Message-State: AJIora+OGojG5wFqnb0EeonLs/4HSx8RMhxXRV3t/tvOI0jF58o+KFZb meorjFlEuWccrJ1WWJ++tgPr8g7jWeNgdpI3Jw== X-Google-Smtp-Source: AGRyM1uyhPISg+ylS606kbQmjVcPYblSh0zIWTy2KDjhJBy7OL6s9V2L9bR+SAwwb9z1QoXAfY2vMc1gsnfMDuOPFg== X-Received: from kaleshsingh.mtv.corp.google.com ([2620:15c:211:200:5a87:b61e:76b5:d1e0]) (user=kaleshsingh job=sendgmr) by 2002:a0d:d8ce:0:b0:31e:545c:7343 with SMTP id a197-20020a0dd8ce000000b0031e545c7343mr14812233ywe.29.1658383078088; Wed, 20 Jul 2022 22:57:58 -0700 (PDT) Date: Wed, 20 Jul 2022 22:57:21 -0700 In-Reply-To: <20220721055728.718573-1-kaleshsingh@google.com> Message-Id: <20220721055728.718573-11-kaleshsingh@google.com> Mime-Version: 1.0 References: <20220721055728.718573-1-kaleshsingh@google.com> X-Mailer: git-send-email 2.37.0.170.g444d1eabd0-goog Subject: [PATCH v5 10/17] KVM: arm64: Stub implementation of pKVM HYP stack unwinder From: Kalesh Singh To: maz@kernel.org, mark.rutland@arm.com, broonie@kernel.org, madvenka@linux.microsoft.com, tabba@google.com Cc: will@kernel.org, qperret@google.com, kaleshsingh@google.com, james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, catalin.marinas@arm.com, andreyknvl@gmail.com, vincenzo.frascino@arm.com, mhiramat@kernel.org, ast@kernel.org, drjones@redhat.com, wangkefeng.wang@huawei.com, elver@google.com, keirf@google.com, yuzenghui@huawei.com, ardb@kernel.org, oupton@google.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, android-mm@google.com, kernel-team@android.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add some stub implementations of protected nVHE stack unwinder, for building. These are implemented later in this series. Signed-off-by: Kalesh Singh --- Changes in v5: - Mark unwind_next() as inline, per Marc arch/arm64/include/asm/stacktrace/nvhe.h | 59 ++++++++++++++++++++++++ arch/arm64/kvm/hyp/nvhe/stacktrace.c | 3 +- 2 files changed, 60 insertions(+), 2 deletions(-) create mode 100644 arch/arm64/include/asm/stacktrace/nvhe.h diff --git a/arch/arm64/include/asm/stacktrace/nvhe.h b/arch/arm64/include/asm/stacktrace/nvhe.h new file mode 100644 index 000000000000..80d71932afff --- /dev/null +++ b/arch/arm64/include/asm/stacktrace/nvhe.h @@ -0,0 +1,59 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * KVM nVHE hypervisor stack tracing support. + * + * The unwinder implementation depends on the nVHE mode: + * + * 1) pKVM (protected nVHE) mode - the host cannot directly access + * the HYP memory. The stack is unwinded in EL2 and dumped to a shared + * buffer where the host can read and print the stacktrace. + * + * Copyright (C) 2022 Google LLC + */ +#ifndef __ASM_STACKTRACE_NVHE_H +#define __ASM_STACKTRACE_NVHE_H + +#include + +static inline bool on_accessible_stack(const struct task_struct *tsk, + unsigned long sp, unsigned long size, + struct stack_info *info) +{ + return false; +} + +#ifdef __KVM_NVHE_HYPERVISOR__ +/* + * Protected nVHE HYP stack unwinder + * + * In protected mode, the unwinding is done by the hypervisor in EL2. + */ + +#ifdef CONFIG_PROTECTED_NVHE_STACKTRACE +static inline bool on_overflow_stack(unsigned long sp, unsigned long size, + struct stack_info *info) +{ + return false; +} + +static inline int notrace unwind_next(struct unwind_state *state) +{ + return 0; +} +NOKPROBE_SYMBOL(unwind_next); +#else /* !CONFIG_PROTECTED_NVHE_STACKTRACE */ +static inline bool on_overflow_stack(unsigned long sp, unsigned long size, + struct stack_info *info) +{ + return false; +} + +static inline int notrace unwind_next(struct unwind_state *state) +{ + return 0; +} +NOKPROBE_SYMBOL(unwind_next); +#endif /* CONFIG_PROTECTED_NVHE_STACKTRACE */ + +#endif /* __KVM_NVHE_HYPERVISOR__ */ +#endif /* __ASM_STACKTRACE_NVHE_H */ diff --git a/arch/arm64/kvm/hyp/nvhe/stacktrace.c b/arch/arm64/kvm/hyp/nvhe/stacktrace.c index 69e65b457f1c..96c8b93320eb 100644 --- a/arch/arm64/kvm/hyp/nvhe/stacktrace.c +++ b/arch/arm64/kvm/hyp/nvhe/stacktrace.c @@ -4,8 +4,7 @@ * * Copyright (C) 2022 Google LLC */ -#include -#include +#include DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack) __aligned(16); -- 2.37.0.170.g444d1eabd0-goog