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 D9CBAC4338F for ; Mon, 9 Aug 2021 15:24:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C268160E52 for ; Mon, 9 Aug 2021 15:24:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235478AbhHIPZR (ORCPT ); Mon, 9 Aug 2021 11:25:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57632 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235404AbhHIPZO (ORCPT ); Mon, 9 Aug 2021 11:25:14 -0400 Received: from mail-qv1-xf49.google.com (mail-qv1-xf49.google.com [IPv6:2607:f8b0:4864:20::f49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B3558C0613D3 for ; Mon, 9 Aug 2021 08:24:53 -0700 (PDT) Received: by mail-qv1-xf49.google.com with SMTP id v6-20020a0cf9060000b029035546f11a23so1027891qvn.2 for ; Mon, 09 Aug 2021 08:24:53 -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=9BduUGnjsWum8FcOsM11gO3G+u8+79slhTeMYYKry4w=; b=g983I9YSVoWH/a7/cl0ZycwVjzqZeyo8x+fLCew59C7a0BnEu2wL6cysC50kAFs8Vi ehEdfCFNUnOWvVuDeMXGfwSfjkPO6irIfVDI1BOyVgOb2mistjn/3qc9aekGj3nyWfEP mv2IxEl7l/db3vL40dr7vcCKECuWFlGEQTsXsxS+OPHN8h4PW005Da05hkZ4QrGVi6/c iy5E1D2xv8HABlnaCg5SV0NZvQskMmKX3vG7+v7NRPhL/iuVTDX753+y/AxDWOc3l6hM igtE3JtznbdG+M1JR7b47U5TTSHB4/v8dAR/v0CBrRKmc9w4iH1rKAt2xMXY4Rmb58AP IwiA== 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=9BduUGnjsWum8FcOsM11gO3G+u8+79slhTeMYYKry4w=; b=ZTXhTayObHpoBkKQL/OyIrUYvRgg0DkUorUZklvKFUinr6KQpJc8bxhwd+2V4kdfbz 99dE9oi60obrKGEsBwmfNiTGV7bzxndd34ugaUFwFUlw/4+pvja4YAcCq2qV/NAY1A7q RYO73m3gTiPntXUwd6vsTD8kVPdNIbCQcOB9rViiaLEbRiOHBbyE1Gk2igomow0arvmt Xxm0dYJwC/+yV/G7+/QdmQU4AnBoe1ZMu751misHpS1LBthgGBCWKh9D4ttoLUIEBn+a msiX384cq7Ly6BPpReFf7+4LIJUiFCpLBeX8eRshtq9h7r9elWf2KtYmtVf08NkR18fk JxNw== X-Gm-Message-State: AOAM533b/qfOePnf0WO4luAsGfpRU58PWw+p20pWV+JfDENL7MZt7Xh3 E2tWW62DQBH72Hc2m1I4MvsIFxjqK01s X-Google-Smtp-Source: ABdhPJxcZ9biebm1fDKv+UMiqbVL5l0nCshM5eLfjTeBhNH2YYSYI90HGbAFPRYEaW9dglJFBj8tlcbiknXL X-Received: from luke.lon.corp.google.com ([2a00:79e0:d:210:b0e8:d460:758b:a0ae]) (user=qperret job=sendgmr) by 2002:a0c:e609:: with SMTP id z9mr9405599qvm.37.1628522692904; Mon, 09 Aug 2021 08:24:52 -0700 (PDT) Date: Mon, 9 Aug 2021 16:24:28 +0100 In-Reply-To: <20210809152448.1810400-1-qperret@google.com> Message-Id: <20210809152448.1810400-2-qperret@google.com> Mime-Version: 1.0 References: <20210809152448.1810400-1-qperret@google.com> X-Mailer: git-send-email 2.32.0.605.g8dce9f2422-goog Subject: [PATCH v4 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, qperret@google.com 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__ */ -- 2.32.0.605.g8dce9f2422-goog