From nobody Sat Oct 4 01:39:01 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0BA032D6E5D; Thu, 21 Aug 2025 14:26:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755786373; cv=none; b=rDzjlfZgtSt/fl+d9Tr+QeLG7dbFd7orWv2QGCMyqU5pO7wjA11P0OHQ+8IGFdW5RvMo1mcyw4rNSI2ro3z3svNmJPiHOMf/oHaQDhG2i/WrsWjoYv/hewBSmTzWlvgwC+JufmjNMPiUm1OLqvi2Re/wNoUf2Ro8FfsOWE83hyw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755786373; c=relaxed/simple; bh=G0YrLOlqNEkhmNDKqjNXIej+ao+iP0qZxWm/nWbxgcU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=QF5PaYhXVtL8/Odfjm0qcLN8OxSBCghdhdxyxrou0zI8F7q5WHAsA6R2u+863xkFURlR1Y+lyiuEd0qGPCKV+iimosQxKNVGIA4tQv26yEgiMxalxUIJzp+cbV55Xhj8PdGKi9o/zXR5KqegWvMgmcP9672D/wCrXWCU4IazRwg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nIUwo+87; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="nIUwo+87" 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> 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 Content-Type: text/plain; charset="utf-8" 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); =20 void __init kvm_riscv_gstage_vmid_detect(void) { - unsigned long old; - /* Figure-out number of VMID bits in HW */ - old =3D csr_read(CSR_HGATP); csr_write(CSR_HGATP, (kvm_riscv_gstage_mode << HGATP_MODE_SHIFT) | HGATP_= VMID); vmid_bits =3D csr_read(CSR_HGATP); vmid_bits =3D (vmid_bits & HGATP_VMID) >> HGATP_VMID_SHIFT; vmid_bits =3D fls_long(vmid_bits); - csr_write(CSR_HGATP, old); + csr_write(CSR_HGATP, 0); =20 /* We polluted local TLB so flush all guest TLB */ kvm_riscv_local_hfence_gvma_all(); --=20 2.40.1