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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1726443095; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=U+/24G//Ch8Yv0HN3P/EzAbY8BhMmG1vwPYM2IzWMkI=; b=G2q3+hBYWKs7DLa6bkJL2KwM5wi3hOQ1ziN6qWJ0K7vRQKD7/XaEJrnBHkrgMaMHYFHkOQ 5vcPDLcbXCv7a5pOyeo0EZm8nkK1RKEgPifHwROlY2MaUesHViwRRlp1xecaMz+cQqRfqb 2LkAiFThiILXSnXlucH/bXbwZyXgUDs= X-MC-Unique: R_6FpWW2O0efbtMYlkmJFA-1 From: Gavin Shan To: qemu-arm@nongnu.org Cc: qemu-devel@nongnu.org, david@redhat.com, imammedo@redhat.com, philmd@linaro.org, pbonzini@redhat.com, peter.maydell@linaro.org, zhenyzha@redhat.com, shan.gavin@gmail.com Subject: [PATCH] hostmem: Apply merge property after the memory region is initialized Date: Mon, 16 Sep 2024 09:31:17 +1000 Message-ID: <20240915233117.478169-1-gshan@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 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=170.10.133.124; envelope-from=gshan@redhat.com; helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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: pass (identity @redhat.com) X-ZM-MESSAGEID: 1726443167603116600 Content-Type: text/plain; charset="utf-8" The semantic change has been introduced by commit 5becdc0ab0 ("hostmem: simplify the code for merge and dump properties") even it clarifies that no senmatic change has been introduced. After the commit, the merge property can be applied even the corresponding memory region isn't initialized yet. This leads to crash dump by the following command lines. # /home/gavin/sandbox/qemu.main/build/qemu-system-aarch64 \ -accel kvm -machine virt -cpu host \ -object memory-backend-ram,id=3Dmem-memN0,size=3D4096M,merge=3Doff : qemu-system-aarch64: ../system/memory.c:2419: memory_region_get_ram_ptr= : \ Assertion `mr->ram_block' failed. Fix it by applying the merge property only when the memory region is initialized. Fixes: 5becdc0ab083 ("hostmem: simplify the code for merge and dump propert= ies") Reported-by: Zhenyu Zhang Signed-off-by: Gavin Shan Tested-by: Zhenyu Zhang --- backends/hostmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/backends/hostmem.c b/backends/hostmem.c index 4e5576a4ad..181446626a 100644 --- a/backends/hostmem.c +++ b/backends/hostmem.c @@ -178,7 +178,7 @@ static void host_memory_backend_set_merge(Object *obj, = bool value, Error **errp) return; } =20 - if (!host_memory_backend_mr_inited(backend) && + if (host_memory_backend_mr_inited(backend) && value !=3D backend->merge) { void *ptr =3D memory_region_get_ram_ptr(&backend->mr); uint64_t sz =3D memory_region_size(&backend->mr); --=20 2.45.2