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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id z15-20020a05600c114f00b003fbb5506e54sm11450675wmz.29.2023.07.31.07.15.37 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Jul 2023 07:15:37 -0700 (PDT) From: Peter Maydell To: qemu-devel@nongnu.org Subject: [PULL 5/6] kvm: Fix crash due to access uninitialized kvm_state Date: Mon, 31 Jul 2023 15:15:32 +0100 Message-Id: <20230731141533.3303894-6-peter.maydell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230731141533.3303894-1-peter.maydell@linaro.org> References: <20230731141533.3303894-1-peter.maydell@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::332; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x332.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, T_SCC_BODY_TEXT_LINE=-0.01 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+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org From: Gavin Shan Runs into core dump on arm64 and the backtrace extracted from the core dump is shown as below. It's caused by accessing uninitialized @kvm_state in kvm_flush_coalesced_mmio_buffer() due to commit 176d073029 ("hw/arm/virt: Use machine_memory_devices_init()"), where the machine's memory region is added earlier than before. main qemu_init configure_accelerators qemu_opts_foreach do_configure_accelerator accel_init_machine kvm_init virt_kvm_type virt_set_memmap machine_memory_devices_init memory_region_add_subregion memory_region_add_subregion_common memory_region_update_container_subregions memory_region_transaction_begin qemu_flush_coalesced_mmio_buffer kvm_flush_coalesced_mmio_buffer Fix it by bailing early in kvm_flush_coalesced_mmio_buffer() on the uninitialized @kvm_state. With this applied, no crash is observed on arm64. Fixes: 176d073029 ("hw/arm/virt: Use machine_memory_devices_init()") Signed-off-by: Gavin Shan Reviewed-by: David Hildenbrand Reviewed-by: Philippe Mathieu-Daudé Message-id: 20230731125946.2038742-1-gshan@redhat.com Signed-off-by: Peter Maydell --- accel/kvm/kvm-all.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 373d876c058..7b3da8dc3ab 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -2812,7 +2812,7 @@ void kvm_flush_coalesced_mmio_buffer(void) { KVMState *s = kvm_state; - if (s->coalesced_flush_in_progress) { + if (!s || s->coalesced_flush_in_progress) { return; }