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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 D7841CA0EFC for ; Wed, 20 Aug 2025 13:36:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=xUh84MV3iqpV8sbfPpSzba2ZQvyjslY29VACCbaIu2M=; b=2Q1oQv150tg6mN 7fiMDGqp+D9JYFjt51ijOGb7aOrA1smAYNQvT9+s83wh+PtNRQ+1U4W9PfksTkscOYyOskQy8Zxfy Qa32/95oQObmEyQQmVdNpirIEiEZSDMuPUS8lxjvaU7Luex+8Cb4Tt4iC+Hj7Tmwihe2Jb3qTls5P PoDTgcWNgNr8a5G93CPEgnwAJIO2BgFM194IkO1OakNM8lRf2izyql431pYwWl4iDM7A8sIDBeU5B 4RWe5UeV2V4c9gJjQ3/N50KLX/IHCStfZQPaGRX/P5jR9bP8AiPoVbeIRjsxYYUcGN2e0HXtQeLSU sVpzWpGNdUXbG7HzKRZQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uoiyn-0000000DpOC-396s; Wed, 20 Aug 2025 13:35:53 +0000 Received: from out30-119.freemail.mail.aliyun.com ([115.124.30.119]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uoiQ9-0000000DhBr-0Aw4; Wed, 20 Aug 2025 13:00:08 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1755694799; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=U4wVJ4Rm1M27YjAVFx51yXXj7bzUgmhjmUV0DS4wCbY=; b=DVxyEguKOIi3dEQjyhAiek2Dp4PAZs1wmu9fsLJ6IsSsYS4rFgbMr2wXVdPyna24rtBXQPsMLRycbILHlhjR04DcM446nMcwzxXegfqlVd2cLP03ks76FNhkSAWiJTejVLfsBGq0LZZPgjQCI6objsXPUbcPicvP0nU67wC3wVA= Received: from localhost.localdomain(mailfrom:fangyu.yu@linux.alibaba.com fp:SMTPD_---0WmCQaZj_1755694796 cluster:ay36) by smtp.aliyun-inc.com; Wed, 20 Aug 2025 20:59:57 +0800 From: fangyu.yu@linux.alibaba.com To: anup@brainfault.org, atish.patra@linux.dev, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr Cc: guoren@kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Fangyu Yu Subject: [PATCH v3 2/2] RISC-V KVM: Remove unnecessary HGATP csr_read Date: Wed, 20 Aug 2025 20:59:52 +0800 Message-Id: <20250820125952.71689-3-fangyu.yu@linux.alibaba.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20250820125952.71689-1-fangyu.yu@linux.alibaba.com> References: <20250820125952.71689-1-fangyu.yu@linux.alibaba.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250820_060005_589415_DD6A7FD9 X-CRM114-Status: UNSURE ( 7.24 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: "Guo Ren (Alibaba DAMO Academy)" The HGATP has been set to zero in gstage_mode_detect(), so there is no need to save the old context. Unify the code convention with gstage_mode_detect(). Signed-off-by: Guo Ren (Alibaba DAMO Academy) Signed-off-by: Fangyu Yu --- arch/riscv/kvm/vmid.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/arch/riscv/kvm/vmid.c b/arch/riscv/kvm/vmid.c index 5f33625f4070..abb1c2bf2542 100644 --- a/arch/riscv/kvm/vmid.c +++ b/arch/riscv/kvm/vmid.c @@ -25,15 +25,12 @@ static DEFINE_SPINLOCK(vmid_lock); void __init kvm_riscv_gstage_vmid_detect(void) { - unsigned long old; - /* Figure-out number of VMID bits in HW */ - old = csr_read(CSR_HGATP); csr_write(CSR_HGATP, (kvm_riscv_gstage_mode << HGATP_MODE_SHIFT) | HGATP_VMID); vmid_bits = csr_read(CSR_HGATP); vmid_bits = (vmid_bits & HGATP_VMID) >> HGATP_VMID_SHIFT; vmid_bits = fls_long(vmid_bits); - csr_write(CSR_HGATP, old); + csr_write(CSR_HGATP, 0); /* We polluted local TLB so flush all guest TLB */ kvm_riscv_local_hfence_gvma_all(); -- 2.49.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv