From nobody Fri Oct 2 06:59:42 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id ADFC13D3CE3; Tue, 4 Aug 2026 08:29:13 +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=1785832156; cv=none; b=Y2odJSOhBFb4UjmTsB5BA7bSlgcv7wuE68HNxYTXy4odo5KY7/NMEXFlUibTOTAWYPRos8YdIhOX8+LuMfpoQCgfITDk9nN/sTV1LZ8bH3387LYkbryeqQ84vMnQZmtjQs2v70SUFvIU4AWGq/pO1WK0PuqLUlUz8vnEy0P4miY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785832156; c=relaxed/simple; bh=k7yk5/b7qdepsPMCeaP36SdxlZvojFFonqwUNc0xcSs=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=EoQIjuHcdoRo6/n+x8b9U21zaeFoV7AtWkD0rc5ZM4lBrQ4d9/YUbtSsJvDfWMHIeTFM5XgTCyapBTpVSHiOTUioF1MgBOB5tgsvZ0mryutS8EQL/ER2VX0KuWWQr6pFUKsfJukQMsnGgfZbN6RnqJDinjdUOskLogbibTJai28= 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 _____8DxturXonFqizYKAA--.33315S3; Tue, 04 Aug 2026 16:29:11 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJDxfQfXonFqliwjAA--.5687S2; Tue, 04 Aug 2026 16:29:11 +0800 (CST) From: Bibo Mao To: Huacai Chen Cc: kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] LoongArch: KVM: Set cpu before IN_GUEST_MODE is set Date: Tue, 4 Aug 2026 16:21:53 +0800 Message-Id: <20260804082153.1220709-1-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: qMiowJDxfQfXonFqliwjAA--.5687S2 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" In function kvm_make_vcpu_request(), it will send IPI to physical CPU when vCPU is in IN_GUEST_MODE mode. And physical CPU is set in function kvm_check_vpid(), and it should be called before IN_GUEST_MODE is set. Otherwise IPI will send to wrong old physical CPU where vCPU is running. Fixes: 2fc3bd86db4b ("LoongArch: KVM: Implement basic vcpu interfaces") Cc: stable@vger.kernel.org Signed-off-by: Bibo Mao --- arch/loongarch/kvm/vcpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 20c207d80e31..fd0dd22a7162 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -300,10 +300,10 @@ static int kvm_pre_enter_guest(struct kvm_vcpu *vcpu) */ local_irq_disable(); kvm_deliver_exception(vcpu); + kvm_check_vpid(vcpu); /* Make sure the vcpu mode has been written */ smp_store_mb(vcpu->mode, IN_GUEST_MODE); kvm_deliver_intr(vcpu); - kvm_check_vpid(vcpu); =20 /* * Called after function kvm_check_vpid() base-commit: 075b74841bd0065a3bda3440873c747938e69b68 --=20 2.39.3