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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429897e763csm3983570f8f.6.2025.10.23.06.06.36 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 23 Oct 2025 06:06:37 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Paolo Bonzini , Richard Henderson , Mohamed Mediouni , Stefan Hajnoczi , Alexander Graf , Peter Collingbourne , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Cameron Esfahani , qemu-arm@nongnu.org, Mads Ynddal , Phil Dennis-Jordan , Peter Maydell , Roman Bolshakov Subject: [PATCH v2 44/58] accel/hvf: Have WFI returns if !cpu_has_work Date: Thu, 23 Oct 2025 15:06:20 +0200 Message-ID: <20251023130625.9157-3-philmd@linaro.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251023114638.5667-1-philmd@linaro.org> References: <20251023114638.5667-1-philmd@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::335; envelope-from=philmd@linaro.org; helo=mail-wm1-x335.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 Signed-off-by: Philippe Mathieu-Daudé --- target/arm/hvf/hvf.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c index cf4746c344a..8c2eac6738f 100644 --- a/target/arm/hvf/hvf.c +++ b/target/arm/hvf/hvf.c @@ -1749,6 +1749,13 @@ static void hvf_wfi(CPUState *cpu) uint64_t nanos; uint32_t cntfrq; + if (cpu_has_work(cpu)) { + /* Don't bother to go into our "low power state" if + * we would just wake up immediately. + */ + return; + } + if (cpu_test_interrupt(cpu, CPU_INTERRUPT_HARD | CPU_INTERRUPT_FIQ)) { /* Interrupt pending, no need to wait */ return; -- 2.51.0