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 10CC9C433EF for ; Thu, 21 Jul 2022 05:58:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231324AbiGUF6V (ORCPT ); Thu, 21 Jul 2022 01:58:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46706 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231314AbiGUF6D (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 889D079ECF for ; Wed, 20 Jul 2022 22:58:01 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-31cb93cadf2so6663457b3.11 for ; Wed, 20 Jul 2022 22:58:01 -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=nCSrSlEZfmkYkOyHMY9qhudKEgt1DEv4mdp7iaevl2w=; b=Y/BckGi3KCbT4iTn1vHoKO+iIoWVzxgW89Wp+bOCHdv6z7DbV4KkriSzgVPMZM6mWf t3Np8DXW4dxPpv1lZ5ZyzliMfc/WzlVRbViT1axXnESIU//dO2Ysbj6tQOaoZ9haMLzM 9b/3MYA906Tt2nrxQ7kX5DGCsmAD8wAnpTJjIGSrmH1tdShxTdRcuYbTXYHCmYUuh7fz AWiZn7q8TwP9i1Aif5D8zObMsZHYtY96eTqOEQlPJ0Veyv6fV8OH2lqzlNq4raV87REf kf/8wbZvR0pUDOd2o2Tzm/0YdmklhPmQ7GhOaf+HJLSF1Xt6QydN+Dsd7+7qD1ZygSMt jTLg== 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=nCSrSlEZfmkYkOyHMY9qhudKEgt1DEv4mdp7iaevl2w=; b=k81AEK0Xz85ko0KIDqOOoUFof4DPaGd0B1fj1vaHgL+59/0xnaJnB1zcfVlbdFRP6Z /jUv1iAJf2AKBTDJfcLnsMPol6UVXCb9AR+uZaiOGh1zreCOLxiUqZsmNCEaJp6LUy1r oGTOzv+XiFe1e0lgZFJ8qDzLY7BWrwZPflpcWwOprW8Clal5SIJ7G0gEWDzg6HSGpsPT sXyABW3POqLExYEmjTPuZjO2y8evo2j5N7li8Cmj+Oy6EgEnoN6dSBjuVEh1LmqEEMHo WTzg4D7/3z16I/itSnNCUwEaJC8zHLch8PwzpAxuhglcASG5aFvcfr9qmJuvxQlYq5qh iIPw== X-Gm-Message-State: AJIora/ZOpIukLKKg1Sgwse17HE175Df6Gx2+2Dv8/oAekQmgJJTMEO5 kdRWQ8/TP/DxJiD35MKxTAs86wzVQWBsVoRmWQ== X-Google-Smtp-Source: AGRyM1uVWbefCZQE+IW0YShATcxYbZ1HKKXbblRtksHLoReZ4Hx2UeN/4FbZ98rwLnifcfwg5BzwKCYVTc0NlvD1nQ== X-Received: from kaleshsingh.mtv.corp.google.com ([2620:15c:211:200:5a87:b61e:76b5:d1e0]) (user=kaleshsingh job=sendgmr) by 2002:a0d:c587:0:b0:31e:8bab:394d with SMTP id h129-20020a0dc587000000b0031e8bab394dmr182248ywd.107.1658383080824; Wed, 20 Jul 2022 22:58:00 -0700 (PDT) Date: Wed, 20 Jul 2022 22:57:22 -0700 In-Reply-To: <20220721055728.718573-1-kaleshsingh@google.com> Message-Id: <20220721055728.718573-12-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 11/17] KVM: arm64: Stub implementation of non-protected nVHE 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 stub implementations of non-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 - Comment !__KVM_NVHE_HYPERVISOR__ unwinder path, per Marc arch/arm64/include/asm/stacktrace/nvhe.h | 26 ++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/arch/arm64/include/asm/stacktrace/nvhe.h b/arch/arm64/include/asm/stacktrace/nvhe.h index 80d71932afff..3078501f8e22 100644 --- a/arch/arm64/include/asm/stacktrace/nvhe.h +++ b/arch/arm64/include/asm/stacktrace/nvhe.h @@ -8,6 +8,12 @@ * the HYP memory. The stack is unwinded in EL2 and dumped to a shared * buffer where the host can read and print the stacktrace. * + * 2) Non-protected nVHE mode - the host can directly access the + * HYP stack pages and unwind the HYP stack in EL1. This saves having + * to allocate shared buffers for the host to read the unwinded + * stacktrace. + * + * * Copyright (C) 2022 Google LLC */ #ifndef __ASM_STACKTRACE_NVHE_H @@ -55,5 +61,25 @@ static inline int notrace unwind_next(struct unwind_state *state) NOKPROBE_SYMBOL(unwind_next); #endif /* CONFIG_PROTECTED_NVHE_STACKTRACE */ +#else /* !__KVM_NVHE_HYPERVISOR__ */ +/* + * Conventional (non-protected) nVHE HYP stack unwinder + * + * In non-protected mode, the unwinding is done from kernel proper context + * (by the host in EL1). + */ + +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 /* __KVM_NVHE_HYPERVISOR__ */ #endif /* __ASM_STACKTRACE_NVHE_H */ -- 2.37.0.170.g444d1eabd0-goog