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Tue, 03 Mar 2026 20:10:07 -0800 (PST) Received: from jchang-1875.internal.sifive.com ([136.226.240.169]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ae54136b28sm71058815ad.73.2026.03.03.20.10.05 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 03 Mar 2026 20:10:07 -0800 (PST) From: Jay Chang To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org Cc: Palmer Dabbelt , Alistair Francis , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , Chao Liu , Jay Chang , Frank Chang Subject: [PATCH 1/2] hw/riscv/riscv-iommu-hpm: Fix irq_overflow_left residual value bug Date: Wed, 4 Mar 2026 12:09:58 +0800 Message-ID: <20260304040959.47267-2-jay.chang@sifive.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20260304040959.47267-1-jay.chang@sifive.com> References: <20260304040959.47267-1-jay.chang@sifive.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::631; envelope-from=jay.chang@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: qemu development 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 Reset irq_overflow_left to 0 before setting up a new timer. Without this fix, a stale irq_overflow_left value from a previous timer setup could cause incorrect timer behavior. Signed-off-by: Jay Chang Reviewed-by: Frank Chang --- hw/riscv/riscv-iommu-hpm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/riscv/riscv-iommu-hpm.c b/hw/riscv/riscv-iommu-hpm.c index c5034bff79..e8d284ac8b 100644 --- a/hw/riscv/riscv-iommu-hpm.c +++ b/hw/riscv/riscv-iommu-hpm.c @@ -228,6 +228,7 @@ static void hpm_setup_timer(RISCVIOMMUState *s, uint64_t value) } overflow_at = (uint64_t)qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + overflow_ns; + s->irq_overflow_left = 0; if (overflow_at > INT64_MAX) { s->irq_overflow_left = overflow_at - INT64_MAX; -- 2.48.1