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[144.168.56.201]) by smtp.gmail.com with ESMTPSA id 6sm7894996pfd.212.2021.01.22.04.30.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Jan 2021 04:30:16 -0800 (PST) From: Bin Meng To: Alistair Francis , qemu-devel@nongnu.org, qemu-riscv@nongnu.org Subject: [PATCH 3/4] hw/riscv: virt: Limit RAM size in a 32-bit system Date: Fri, 22 Jan 2021 20:29:57 +0800 Message-Id: <20210122122958.12311-4-bmeng.cn@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210122122958.12311-1-bmeng.cn@gmail.com> References: <20210122122958.12311-1-bmeng.cn@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::633; envelope-from=bmeng.cn@gmail.com; helo=mail-pl1-x633.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, FREEMAIL_FROM=0.001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bin Meng Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Bin Meng RV32 supports 34-bit physical address hence the maximum RAM size should be limitted. Limit the RAM size to 10 GiB, which leaves some room for PCIe high mmio space. Signed-off-by: Bin Meng --- hw/riscv/virt.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c index 1d05bb3ef9..4f44509360 100644 --- a/hw/riscv/virt.c +++ b/hw/riscv/virt.c @@ -590,6 +590,19 @@ static void virt_machine_init(MachineState *machine) } } + /* limit RAM size in a 32-bit system */ + if (riscv_is_32bit(&s->soc[0])) { + /* + * Cast machine->ram_size to 64-bit for 32-bit host, + * to make the build on 32-bit host happy. + */ + if ((uint64_t)(machine->ram_size) > 10 * GiB) { + /* 32-bit host won't have a chance to execute here */ + machine->ram_size = 10 * GiB; + error_report("Limitting RAM size to 10 GiB"); + } + } + /* register system main memory (actual RAM) */ memory_region_init_ram(main_mem, NULL, "riscv_virt_board.ram", machine->ram_size, &error_fatal); -- 2.25.1