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Fri, 23 Dec 2022 06:23:34 -0800 (PST) Received: from n250-032-048.byted.org ([221.194.189.12]) by smtp.gmail.com with ESMTPSA id a16-20020a17090a6d9000b00223fa0148b8sm4751734pjk.41.2022.12.23.06.23.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Dec 2022 06:23:34 -0800 (PST) From: Chuang Xu To: qemu-devel@nongnu.org Cc: dgilbert@redhat.com, quintela@redhat.com, pbonzini@redhat.com, peterx@redhat.com, david@redhat.com, philmd@linaro.org, zhouyibo@bytedance.com, Chuang Xu Subject: [RFC v4 2/3] memory: add depth assert in address_space_to_flatview Date: Fri, 23 Dec 2022 22:23:06 +0800 Message-Id: <20221223142307.1614945-3-xuchuangxclwt@bytedance.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20221223142307.1614945-1-xuchuangxclwt@bytedance.com> References: <20221223142307.1614945-1-xuchuangxclwt@bytedance.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::62e; envelope-from=xuchuangxclwt@bytedance.com; helo=mail-pl1-x62e.google.com X-Spam_score_int: 6 X-Spam_score: 0.6 X-Spam_bar: / X-Spam_report: (0.6 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FROM_LOCAL_NOVOWEL=0.5, HK_RANDOM_ENVFROM=0.999, HK_RANDOM_FROM=0.999, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Before using any flatview, sanity check we're not during a memory region transaction or the map can be invalid. Signed-off-by: Chuang Xu Signed-off-by: Chuang Xu --- include/exec/memory.h | 9 +++++++++ softmmu/memory.c | 5 +++++ 2 files changed, 14 insertions(+) diff --git a/include/exec/memory.h b/include/exec/memory.h index 91f8a2395a..66c43b4862 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -1069,8 +1069,17 @@ struct FlatView { MemoryRegion *root; }; +int memory_region_transaction_get_depth(void); + static inline FlatView *address_space_to_flatview(AddressSpace *as) { + /* + * Before using any flatview, sanity check we're not during a memory + * region transaction or the map can be invalid. Note that this can + * also be called during commit phase of memory transaction, but that + * should also only happen when the depth decreases to 0 first. + */ + assert(memory_region_transaction_get_depth() == 0 || rcu_read_locked()); return qatomic_rcu_read(&as->current_map); } diff --git a/softmmu/memory.c b/softmmu/memory.c index bc0be3f62c..01192e2e5b 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1116,6 +1116,11 @@ void memory_region_transaction_commit(void) } } +int memory_region_transaction_get_depth(void) +{ + return memory_region_transaction_depth; +} + static void memory_region_destructor_none(MemoryRegion *mr) { }