From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1A3A3C87FC9 for ; Tue, 29 Jul 2025 16:40:25 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ugnMg-0002UY-4G; Tue, 29 Jul 2025 12:39:47 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ugn1K-0003I2-7Z for qemu-devel@nongnu.org; Tue, 29 Jul 2025 12:17:53 -0400 Received: from out-181.mta1.migadu.com ([95.215.58.181]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ugn17-0001HB-Eu for qemu-devel@nongnu.org; Tue, 29 Jul 2025 12:17:41 -0400 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1753805841; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=M2ZO+yRcPzN1e4ri+7Jvh6MuhG7j6tOGfAAa9Axt08Q=; b=AxYF/EJZj1Y+KX0IXgVhyjWAQ5ltobnEzoo77lxKg+aZPMgED4IR/WF+8D2lSi0RIdzbQx Z7Ptm1p5783RlKplUIPs8s0BksSsb6WvUIO0KBkuIA1vgcN/cuYLXMD8+AeBCyAaH1FsYn Uei0pIFdFtsyklBPhCoJuINqAp8+nvk= From: Zenghui Yu To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, Zenghui Yu Subject: [PATCH 1/2] hw/intc/arm_gicv3_kvm: Remove writes to ICPENDR registers Date: Wed, 30 Jul 2025 00:16:49 +0800 Message-Id: <20250729161650.43758-2-zenghui.yu@linux.dev> In-Reply-To: <20250729161650.43758-1-zenghui.yu@linux.dev> References: <20250729161650.43758-1-zenghui.yu@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Received-SPF: pass client-ip=95.215.58.181; envelope-from=zenghui.yu@linux.dev; helo=out-181.mta1.migadu.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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_LOW=-0.7, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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 As per the arm-vgic-v3 kernel doc [1]: Accesses to GICD_ICPENDR register region and GICR_ICPENDR0 registers have RAZ/WI semantics, meaning that reads always return 0 and writes are always ignored. Remove the useless writes to ICPENDR registers in kvm_arm_gicv3_put(). [1] https://docs.kernel.org/virt/kvm/devices/arm-vgic-v3.html Signed-off-by: Zenghui Yu --- hw/intc/arm_gicv3_kvm.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/hw/intc/arm_gicv3_kvm.c b/hw/intc/arm_gicv3_kvm.c index 8ed88e7429..f798a6e28c 100644 --- a/hw/intc/arm_gicv3_kvm.c +++ b/hw/intc/arm_gicv3_kvm.c @@ -387,8 +387,6 @@ static void kvm_arm_gicv3_put(GICv3State *s) reg = c->level; kvm_gic_line_level_access(s, 0, ncpu, ®, true); - reg = ~0; - kvm_gicr_access(s, GICR_ICPENDR0, ncpu, ®, true); reg = c->gicr_ipendr0; kvm_gicr_access(s, GICR_ISPENDR0, ncpu, ®, true); @@ -445,7 +443,7 @@ static void kvm_arm_gicv3_put(GICv3State *s) kvm_gic_put_line_level_bmp(s, s->level); /* s->pending bitmap -> GICD_ISPENDRn */ - kvm_dist_putbmp(s, GICD_ISPENDR, GICD_ICPENDR, s->pending); + kvm_dist_putbmp(s, GICD_ISPENDR, 0, s->pending); /* s->active bitmap -> GICD_ISACTIVERn */ kvm_dist_putbmp(s, GICD_ISACTIVER, GICD_ICACTIVER, s->active); -- 2.34.1