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 X-Spam-Level: X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D5C78C432BE for ; Thu, 29 Jul 2021 13:28:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AF8B060184 for ; Thu, 29 Jul 2021 13:28:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237575AbhG2N2a (ORCPT ); Thu, 29 Jul 2021 09:28:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46140 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237462AbhG2N22 (ORCPT ); Thu, 29 Jul 2021 09:28:28 -0400 Received: from mail-qk1-x749.google.com (mail-qk1-x749.google.com [IPv6:2607:f8b0:4864:20::749]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 777F1C061765 for ; Thu, 29 Jul 2021 06:28:25 -0700 (PDT) Received: by mail-qk1-x749.google.com with SMTP id j12-20020a05620a146cb02903ad9c5e94baso3795910qkl.16 for ; Thu, 29 Jul 2021 06:28:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=crBqYydgsM0lLmpXbxrQzqnfwJboPEMWJ5uFG+CB388=; b=JOIVCVkTKSE7PwC39f/uN10vnOvi7Vzp2RTafhg3kyIB15DlDdxcNRRjKoM75ogyTS sjmXizIUunrQ4Q2yIkfgmJDrNF8nuB33MW7tB7YPCbcNhgcnStKG61TKLA9OHyXOwzKH i7uDNzA+PPHFpfTHJs2M5QoYOwbb6NUXBh++UvXlYe3cdezMzPl1EZ3sOx0jBVOxIit7 DsJ4Rk2OJv96rif4hnZqeL50UBKsRJGWc8A2EaMc0YZVDJkZTXTjcJfL1x72E+Z4uyBi PGyvbycBPgY92pQ84g5f29LjEY96+E8Pod3jV3Xa3E41vkI8XuIPX9jDrr0GlJ2pzzRS RQTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=crBqYydgsM0lLmpXbxrQzqnfwJboPEMWJ5uFG+CB388=; b=dypNxDTa3+Z75+4T6HPjpXDQnwWh0DBlnJcuDd1JNSUovP1/8ueSx1UaUz3Ta8XLzX jzDPCi8zhp3l1rDBG8fKnTxTTrk02c1wi2AoRQFUTHuXFhO/zevRol1akJlW7xtAux+y 5nzgDF8OnbqbVQKcBExA5pIadJ8pP0daFN0XdjKbquvJ00cPF0Y5zKjLNff4+btN9kqQ +XUVxcmpUhtNjs8ejHxlq/xMG7/XGfaczRKq1nqb3hoD0czGlRz/8UQccURWqjaADyIK OSG1bCHPHEvKoD4/wghpTi4CEIuVGqR7IA+5isSxUquEvbLTIwlvUyDQt1dYWmgJzlf1 OXIw== X-Gm-Message-State: AOAM530JMjc38DmzwA/2I5oXBSQHcJEgbVnGkt8F8Rnfiful0n5Wwuiz kKv8UcJmzR38LS1Ebpx7eWcEkmPrWxtj X-Google-Smtp-Source: ABdhPJxHRTBRw3rhOotBjYPWwjVk04U8m2F1PsiYgMcXVSq1/9Rd7rzCjHaUtz4DsAzceZrGz5P9KOU1HQzs X-Received: from luke.lon.corp.google.com ([2a00:79e0:d:210:293a:bc89:7514:5218]) (user=qperret job=sendgmr) by 2002:a05:6214:1021:: with SMTP id k1mr5318862qvr.4.1627565304476; Thu, 29 Jul 2021 06:28:24 -0700 (PDT) Date: Thu, 29 Jul 2021 14:27:58 +0100 In-Reply-To: <20210729132818.4091769-1-qperret@google.com> Message-Id: <20210729132818.4091769-2-qperret@google.com> Mime-Version: 1.0 References: <20210729132818.4091769-1-qperret@google.com> X-Mailer: git-send-email 2.32.0.432.gabb21c7263-goog Subject: [PATCH v3 01/21] KVM: arm64: Add hyp_spin_is_locked() for basic locking assertions at EL2 From: Quentin Perret To: maz@kernel.org, james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, catalin.marinas@arm.com, will@kernel.org Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, ardb@kernel.org, qwandor@google.com, tabba@google.com, dbrazdil@google.com, kernel-team@android.com, Quentin Perret Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Will Deacon Introduce hyp_spin_is_locked() so that functions can easily assert that a given lock is held (albeit possibly by another CPU!) without having to drag full lockdep support up to EL2. Signed-off-by: Will Deacon Signed-off-by: Quentin Perret --- arch/arm64/kvm/hyp/include/nvhe/spinlock.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm64/kvm/hyp/include/nvhe/spinlock.h b/arch/arm64/kvm/hyp/include/nvhe/spinlock.h index 76b537f8d1c6..04f65b655fcf 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/spinlock.h +++ b/arch/arm64/kvm/hyp/include/nvhe/spinlock.h @@ -15,6 +15,7 @@ #include #include +#include typedef union hyp_spinlock { u32 __val; @@ -89,4 +90,11 @@ static inline void hyp_spin_unlock(hyp_spinlock_t *lock) : "memory"); } +static inline bool hyp_spin_is_locked(hyp_spinlock_t *lock) +{ + hyp_spinlock_t lockval = READ_ONCE(*lock); + + return lockval.owner != lockval.next; +} + #endif /* __ARM64_KVM_NVHE_SPINLOCK_H__ */ -- 2.32.0.432.gabb21c7263-goog