From nobody Sun Nov 24 00:27:42 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1728845319877698.7383810711764; Sun, 13 Oct 2024 11:48:39 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t03cz-0001IJ-Eq; Sun, 13 Oct 2024 14:47:41 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t03cx-0001Hi-9k for qemu-devel@nongnu.org; Sun, 13 Oct 2024 14:47:39 -0400 Received: from mail-pl1-x629.google.com ([2607:f8b0:4864:20::629]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1t03cv-0002So-NL for qemu-devel@nongnu.org; Sun, 13 Oct 2024 14:47:39 -0400 Received: by mail-pl1-x629.google.com with SMTP id d9443c01a7336-20c805a0753so29309765ad.0 for ; Sun, 13 Oct 2024 11:47:37 -0700 (PDT) Received: from stoup.. (174-21-81-121.tukw.qwest.net. [174.21.81.121]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20c8c35522fsm52811805ad.296.2024.10.13.11.47.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Oct 2024 11:47:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1728845256; x=1729450056; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=izfDyS+bmapVSfLYtSn4xLMYlKwDBm7aSJ/Y/fO7PVc=; b=xw+Aqhga1XmHQB4oBwwXzyZF+3mVHgEHq0KoZhlR5IcvF3ZJU5euEy1XmAUmLEjQ9J Yr6cvNyrtw/fczbLKyKUCdseJSkLbLERh6vu60Dh9XMSUvDog50XHo3U8NA9vpHTEexB To1aceN9agILl4ABYLU+P43CELDx7oHqWUiJZvQ17UnJXftVWhJ2lSkyFavsTs3/o9mE vKX1mGVP7Pd/UAIeoRcE3wB5KmpKe88mM/HMpv/ghXa+/5cjFXsgg9UnjFnP1D8eVX5+ /4QKD6Ca9v/iKZQG2qdSEMDUTTJ+mjUYq/6aS+YHsTzOdaej1unZ4jjiJRAXPBD/T6lo Ss+A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728845256; x=1729450056; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=izfDyS+bmapVSfLYtSn4xLMYlKwDBm7aSJ/Y/fO7PVc=; b=p4z18/bA+xvq+EHQtXmLyDJCh9ky4/jFRXAQZEYyaGCo8HRVSbTi4WRhHuRVpbDkjr LHj4I48DEX5mAjzR40j/OIycl57+nSIY9nIBMNKBQPHwUWDeqvyryFtRZzbD0nhSHAcQ MEaJiFllDyAFdaFVg4btYfgSRcJ4J1LdlPptCQxVRRhjDJvY3Kxx+Iu4oqA0WRGQB3hl Az8dEikY3jJkfLh+RJvuM0krrCP+Xn3/rMkcK8Zzjg3eknxIkPkX19dzyMEBvrcelx/3 Q/u1mHuPVxSkkUepXoeijMqiCRZOEpTCrQGCwOVfyjlnBvUhOo5Ip7izQkkjnParV8Bj xbLQ== X-Gm-Message-State: AOJu0YyypFsLx3Sa11E9ZOGkGpm5YjZ4KByjRY69NvtE2/QdfFI4jpJ5 lhk7WldXLv2lvl+tGGj9jHRlAomMKN4pzdKHLJCpHTckYdOvpwbwv0JsnJgU1OEmRMyaT5lvJyC + X-Google-Smtp-Source: AGHT+IGyUUNkT5YyYYHfSH0LiuRwYmDXbHX14viFmUjMqI3hlOf47FabMHo/AaQEn83bsci8kkjsmA== X-Received: by 2002:a17:903:1d0:b0:20c:e262:2580 with SMTP id d9443c01a7336-20ce2622835mr28409195ad.44.1728845256268; Sun, 13 Oct 2024 11:47:36 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= Subject: [PATCH v2 1/3] include/exec: Improve probe_access_full{, _mmu} documentation Date: Sun, 13 Oct 2024 11:47:31 -0700 Message-ID: <20241013184733.1423747-2-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241013184733.1423747-1-richard.henderson@linaro.org> References: <20241013184733.1423747-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::629; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x629.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1728845320452116600 Suggested-by: Alex Benn=C3=A9e Signed-off-by: Richard Henderson Reviewed-by: Alex Benn=C3=A9e Reviewed-by: Pierrick Bouvier --- include/exec/exec-all.h | 29 ++++++++++++++--------------- 1 file changed, 14 insertions(+), 15 deletions(-) diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h index 72240ef426..2e4c4cc4b4 100644 --- a/include/exec/exec-all.h +++ b/include/exec/exec-all.h @@ -368,6 +368,13 @@ int probe_access_flags(CPUArchState *env, vaddr addr, = int size, * The CPUTLBEntryFull structure returned via @pfull is transient * and must be consumed or copied immediately, before any further * access or changes to TLB @mmu_idx. + * + * This function will not fault if @nonfault is set, but will + * return TLB_INVALID_MASK if the page is not mapped, or is not + * accessible with @access_type. + * + * This function will return TLB_MMIO in order to force the access + * to be handled out-of-line if plugins wish to instrument the access. */ int probe_access_full(CPUArchState *env, vaddr addr, int size, MMUAccessType access_type, int mmu_idx, @@ -375,22 +382,14 @@ int probe_access_full(CPUArchState *env, vaddr addr, = int size, CPUTLBEntryFull **pfull, uintptr_t retaddr); =20 /** - * probe_access_mmu() - Like probe_access_full except cannot fault and - * doesn't trigger instrumentation. + * probe_access_full_mmu: + * Like probe_access_full, except: * - * @env: CPUArchState - * @vaddr: virtual address to probe - * @size: size of the probe - * @access_type: read, write or execute permission - * @mmu_idx: softmmu index - * @phost: ptr to return value host address or NULL - * @pfull: ptr to return value CPUTLBEntryFull structure or NULL - * - * The CPUTLBEntryFull structure returned via @pfull is transient - * and must be consumed or copied immediately, before any further - * access or changes to TLB @mmu_idx. - * - * Returns: TLB flags as per probe_access_flags() + * This function is intended to be used for page table accesses by + * the target mmu itself. Since such page walking happens while + * handling another potential mmu fault, this function never raises + * exceptions (akin to @nonfault true for probe_access_full). + * Likewise this function does not trigger plugin instrumentation. */ int probe_access_full_mmu(CPUArchState *env, vaddr addr, int size, MMUAccessType access_type, int mmu_idx, --=20 2.43.0