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[59.124.168.89]) by smtp.gmail.com with ESMTPSA id jb12-20020a170903258c00b001e2a3014541sm7182394plb.190.2024.04.14.23.52.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 14 Apr 2024 23:52:50 -0700 (PDT) From: Yong-Xuan Wang To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org Cc: greentime.hu@sifive.com, vincent.chen@sifive.com, frank.chang@sifive.com, jim.shu@sifive.com, Yong-Xuan Wang , Palmer Dabbelt , Alistair Francis , Bin Meng , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , Andrew Jones , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH 1/1] target/riscv/kvm.c: Fix the hart bit setting of AIA Date: Mon, 15 Apr 2024 14:52:43 +0800 Message-Id: <20240415065245.25455-1-yongxuan.wang@sifive.com> X-Mailer: git-send-email 2.17.1 Received-SPF: pass client-ip=2607:f8b0:4864:20::631; envelope-from=yongxuan.wang@sifive.com; helo=mail-pl1-x631.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=unavailable 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org The hart bit setting is different with Linux AIA driver[1] when the number of hart is power of 2. For example, when the guest has 4 harts, the estimated result of AIA driver is 2, whereas we pass 3 to RISC-V/KVM. Since only 2 bits are needed to represent 4 harts, update the formula to get the accurate result. [1] https://lore.kernel.org/all/20240307140307.646078-1-apatel@ventanamicro.com/ Signed-off-by: Yong-Xuan Wang --- target/riscv/kvm/kvm-cpu.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c index 6a6c6cae80f1..388c4ddaa145 100644 --- a/target/riscv/kvm/kvm-cpu.c +++ b/target/riscv/kvm/kvm-cpu.c @@ -1642,7 +1642,14 @@ void kvm_riscv_aia_create(MachineState *machine, uint64_t group_shift, } } - hart_bits = find_last_bit(&max_hart_per_socket, BITS_PER_LONG) + 1; + + if (max_hart_per_socket > 1) { + max_hart_per_socket--; + hart_bits = find_last_bit(&max_hart_per_socket, BITS_PER_LONG) + 1; + } else { + hart_bits = 0; + } + ret = kvm_device_access(aia_fd, KVM_DEV_RISCV_AIA_GRP_CONFIG, KVM_DEV_RISCV_AIA_CONFIG_HART_BITS, &hart_bits, true, NULL); -- 2.17.1