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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1776667781; 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; bh=GU2deRWbajSFRwqWRixl/uXMDf5uGjjmU+yTI3sgtz8=; b=LQDY2pdUldXPSvnE1Hpr9UCgPpUIlJx21WcrKXSucaxd2bjaihVGeIKa31KNggThV52LAS +qv30LbFRexkCRK/hpOBaDYSCodH4AI+6zIkdso5NkPly0qOmBgl0gtsaDkQhSDLuP7AjO ked4rqwcNy4oGdwdx3rtRTtYAUFozL4= X-MC-Unique: lHwC9x6xNX6N-3-KKsG64w-1 X-Mimecast-MFC-AGG-ID: lHwC9x6xNX6N-3-KKsG64w_1776667776 From: Thomas Huth To: Peter Maydell , qemu-arm@nongnu.org Cc: qemu-devel@nongnu.org Subject: [PATCH] hw/arm: Remove hw_error() for the unimplemented CM_LMBUSCNT register Date: Mon, 20 Apr 2026 08:49:33 +0200 Message-ID: <20260420064933.64765-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1776667828997154100 Content-Type: text/plain; charset="utf-8" From: Thomas Huth When writing to this register, QEMU currently aborts: $ echo "readl 0x10000018" | ./qemu-system-arm -audiodev none,id=3Dsnd0 \ -M integratorcp,accel=3Dqtest,audiodev=3Dsnd0 -display none -qtest stdio [I 0.000000] OPENED [R +0.001907] readl 0x10000018 qemu: hardware error: integratorcm_read: CM_LMBUSCNT [...] Aborted (core dumped) This is bad, a guest should ideally never be able to kill QEMU like this. Now, according to the "Intergrator/CP User Guide" from: https://developer.arm.com/documentation/dui0159/b/porting-integrator-ap-an= d-im-pd1/registers "The Integrator/AP CM_LMBUSCNT has been removed." That means this register does not seem to be implemented on real CP boards at all, only for older AP boards. Thus it should be fine if we simply ignore this register in QEMU and handle it like all other unimplemented registers in the "default" handler of the case statement. Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3407 Signed-off-by: Thomas Huth Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- hw/arm/integratorcp.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/hw/arm/integratorcp.c b/hw/arm/integratorcp.c index 0bf519b6bb8..28d478eb52b 100644 --- a/hw/arm/integratorcp.c +++ b/hw/arm/integratorcp.c @@ -107,9 +107,6 @@ static uint64_t integratorcm_read(void *opaque, hwaddr = offset, } else { return s->cm_lock; } - case 6: /* CM_LMBUSCNT */ - /* ??? High frequency timer. */ - hw_error("integratorcm_read: CM_LMBUSCNT"); case 7: /* CM_AUXOSC */ return s->cm_auxosc; case 8: /* CM_SDRAM */ --=20 2.53.0