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 3EFD2CA0EEB for ; Thu, 21 Aug 2025 22:36:00 +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=T0UvbOasgWcWvAGYSY9F8nY/5tRqqJLHOOKTXKa/fSU=; b=v2KewqFp5KAjHV /9wp00snBTKFMZvxIarMACuJz75n/BY+MGeBtAhtS2kNm7pq+q2g4rur2dwaF7lj/xKpT3lT6bwUy 7eatwnSsHO6VPm9eIDA1rtOu56B/eKclOZHP3FFvivx9lnTfX+LraILeC0e0AkWWau2w/iQ6FwJSr Iu3CzLTWciFnwY6kVeTi0/aH72iNA6aqn3Gkl/p9+sabbofvul2mOmRisLLRgbAWQDkr6b9+MG2Nm Bnc+sALWF1+LUSYxLk/gTaK5beT82tcdm4AKBWOY8e47BZ91Dysfrd0njvX1Pjh56foTez43Ck5y+ sZ7jRbKjUPGvpYVlRynA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1upDsm-00000000kYc-3YUO; Thu, 21 Aug 2025 22:35:44 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1up6F3-0000000HDId-3Jgf; Thu, 21 Aug 2025 14:26:14 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id E7A69A58430; Thu, 21 Aug 2025 14:26:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 78E13C4CEEB; Thu, 21 Aug 2025 14:26:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755786372; bh=G0YrLOlqNEkhmNDKqjNXIej+ao+iP0qZxWm/nWbxgcU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nIUwo+87Ry/oXZ6mg9Fw4HZ0MMFxJkXAarXgjf1itGfDNVkddF4Mp9uqfxoFzfwwq dKkxZPxRYY1b8fD4Gzfy77M8ZwRGzu1RRdhCgLkhFVCyRl9G71eTogt/T+i5tI71u+ BllOOUXWaAO6HLOOnHNhwvJlDGq/Rmr3zM/Qy4lQu2tGIUSeYmZSvD2I3ubrSiHccA h5aSW27p/WEpPX2u1iVBmgKU7a0nHp6CD+jOJXNj/XTA4RLvZAdRNMlxXbmUNEvnWf gI32iy8/42hgb5rRDxJhwI6k52FpdkimxQJmeV9X99ERICX2upoWuiSF28m4VDYneg VKarGoW2PNQRA== From: guoren@kernel.org To: guoren@kernel.org, troy.mitchell@linux.dev Cc: alex@ghiti.fr, anup@brainfault.org, aou@eecs.berkeley.edu, atish.patra@linux.dev, fangyu.yu@linux.alibaba.com, guoren@linux.alibaba.com, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, palmer@dabbelt.com, paul.walmsley@sifive.com Subject: [PATCH V4 RESEND 2/3] RISC-V: KVM: Remove unnecessary HGATP csr_read Date: Thu, 21 Aug 2025 10:25:41 -0400 Message-Id: <20250821142542.2472079-3-guoren@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20250821142542.2472079-1-guoren@kernel.org> References: <20250821142542.2472079-1-guoren@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250821_072613_892163_22BEEBB2 X-CRM114-Status: UNSURE ( 9.39 ) 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(). Reviewed-by: Fangyu Yu Signed-off-by: Fangyu Yu Signed-off-by: Guo Ren (Alibaba DAMO Academy) --- 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(); -- 2.40.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv