From nobody Fri Dec 19 19:04:57 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 8B0172D9492; Tue, 14 Oct 2025 09:50:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760435462; cv=none; b=peH7ttZi+ll8Zr3v0cgNe0C/eD5kQ/oBech37qxUNR9tJDPCwNSTNDQfwifPTdqODh73l+KECiJtde0tqBjujLbMaCngNfZuMOxCXuNUUtLIpBBzlm4o/moMkgLK6Pk3xRM9ZFr8jdQatliKZEqUBu/9/6Y7yXtMQLpwHx4Y0eE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760435462; c=relaxed/simple; bh=KHz1B1HQJgmAT3g5P4keVtakO0U0qrIOmzuBpaoJnlQ=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=jT3GbjwiFVB2iLQ+zHUXw2JKY0ZVfJ7Q8UBl+nyTY+mRcuQNRon3sjSeQgQmceP9d/UVxui+Mi8K4jDmvgdAp8Ccn/hdQ0JgMqW9sDL0iidzfnmMN0s2i70pOe0cgXpFHEy0HhufjfYIkYZ42/L+fjBm/Z6iPwV4HXTmqAUXcRA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8Cxbb8BHe5oyfYVAA--.46014S3; Tue, 14 Oct 2025 17:50:57 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJBxTMEBHe5o+V3hAA--.48048S2; Tue, 14 Oct 2025 17:50:57 +0800 (CST) From: Bibo Mao To: Tianrui Zhao , Huacai Chen , Xianglai Li Cc: kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] LoongArch: KVM: Fix max supported vCPUs set with eiointc Date: Tue, 14 Oct 2025 17:50:55 +0800 Message-Id: <20251014095055.1159534-1-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowJBxTMEBHe5o+V3hAA--.48048S2 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" VM fails to boot with 256 vCPUs, the detailed command is qemu-system-loongarch64 -smp 256 and there is error reported as follows: KVM_LOONGARCH_EXTIOI_INIT_NUM_CPU failed: Invalid argument There is typo issue in function kvm_eiointc_ctrl_access() when set max supported vCPUs. Cc: stable@vger.kernel.org Fixes: 47256c4c8b1b ("LoongArch: KVM: Avoid copy_*_user() with lock hold in= kvm_eiointc_ctrl_access()") Signed-off-by: Bibo Mao --- arch/loongarch/kvm/intc/eiointc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/loongarch/kvm/intc/eiointc.c b/arch/loongarch/kvm/intc/ei= ointc.c index c32333695381..a1cc116b4dac 100644 --- a/arch/loongarch/kvm/intc/eiointc.c +++ b/arch/loongarch/kvm/intc/eiointc.c @@ -439,7 +439,7 @@ static int kvm_eiointc_ctrl_access(struct kvm_device *d= ev, spin_lock_irqsave(&s->lock, flags); switch (type) { case KVM_DEV_LOONGARCH_EXTIOI_CTRL_INIT_NUM_CPU: - if (val >=3D EIOINTC_ROUTE_MAX_VCPUS) + if (val > EIOINTC_ROUTE_MAX_VCPUS) ret =3D -EINVAL; else s->num_cpu =3D val; base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787 --=20 2.39.3