From patchwork Sun May 17 04:06:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huacai Chen X-Patchwork-Id: 11553893 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 82F75138A for ; Sun, 17 May 2020 04:08:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6996F207BB for ; Sun, 17 May 2020 04:08:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Q4zNAs5l" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726982AbgEQEIn (ORCPT ); Sun, 17 May 2020 00:08:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48668 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725767AbgEQEIm (ORCPT ); Sun, 17 May 2020 00:08:42 -0400 Received: from mail-pj1-x102a.google.com (mail-pj1-x102a.google.com [IPv6:2607:f8b0:4864:20::102a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E45AFC061A0C; Sat, 16 May 2020 21:08:42 -0700 (PDT) Received: by mail-pj1-x102a.google.com with SMTP id nu7so502215pjb.0; Sat, 16 May 2020 21:08:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=Ahbqm97UA9X6sXan9XG+HLCRcdefKOFp3FssCpJpsAM=; b=Q4zNAs5liCT959Quarek5cZ9AFn8vc3mxuDah3LGe7U7IASBt7tIoiqlsUPkuRPXSf 01jPxu/sgYbiHYzs0gdzneuhSTGwrjNI+W/hmWoer3FAJ4+CxGaWNI9Ame7qRGAmdQJp esENKFD5u8rQxsEpJYOeMN9uHJcTmkzXARuMMy0grL+4wP4E8rAno0nUCaqrQcs28wnk +E2IaCddKQ07k8fIe+Qp+oOFUOOr+rI2IwA00PdczVgbkLSYt4MBys54BggKDiW5gA3t HwFUYH18NapAZVLwt6kuwZWoL2T7w54hwww3v5hktmUQGruY/hHvbct4r85mgzfEm9FX CNrg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references; bh=Ahbqm97UA9X6sXan9XG+HLCRcdefKOFp3FssCpJpsAM=; b=gTHfHeaZAkdfysC6gfmOFK5C+Py3822oG1gNsn4MquE2BtLCITzshjkLhpjATwabOH yOlZrbuBgRT0LrmuL8P/rxc7/ZPa9TZX4ndyJeTFFb9jHtXu7Rdkdnm7gvafoR0XEEYV ktRnfrvdLClNglKdaLR9DL1XBewJLLSsPndduycnlnE387ffRlJz3/NmP80ZmyjYOVRW 4a4GwoZwxlDgRBsGCRpYwFRZSwYm6pabxfo+rv1HT7A34mg5ABMhFeq6oZGWvL38xq/y 5J5ptCVuhkV28jEM+NHAdD2jLTtfDS3goiIDQ3eba2kpwa0qghDT0HlvCNrYuq78zVb9 i65w== X-Gm-Message-State: AOAM533+F9kFL52+7ygj7qs+IV7PdC8DEd/GGbdIGFzzP94KD37dq94x +0ly4x3Kqocf5CfDr2GDDBE= X-Google-Smtp-Source: ABdhPJzJCa8OY3yzBpOednuXeYARj1Q888HVZozWzh4XviY+Ey1VhvYj8Nbd8g5cfllicCAThxmcCw== X-Received: by 2002:a17:90a:9302:: with SMTP id p2mr11966432pjo.230.1589688522525; Sat, 16 May 2020 21:08:42 -0700 (PDT) Received: from software.domain.org (28.144.92.34.bc.googleusercontent.com. [34.92.144.28]) by smtp.gmail.com with ESMTPSA id n9sm5081630pjt.29.2020.05.16.21.08.38 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 16 May 2020 21:08:42 -0700 (PDT) From: Huacai Chen To: Paolo Bonzini , Thomas Bogendoerfer , Aleksandar Markovic Cc: kvm@vger.kernel.org, linux-mips@vger.kernel.org, Fuxin Zhang , Huacai Chen , Jiaxun Yang , Huacai Chen Subject: [PATCH V6 07/15] KVM: MIPS: Use root tlb to control guest's CCA for Loongson-3 Date: Sun, 17 May 2020 12:06:04 +0800 Message-Id: <1589688372-3098-8-git-send-email-chenhc@lemote.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1589688372-3098-1-git-send-email-chenhc@lemote.com> References: <1589688372-3098-1-git-send-email-chenhc@lemote.com> Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org KVM guest has two levels of address translation: guest tlb translates GVA to GPA, and root tlb translates GPA to HPA. By default guest's CCA is controlled by guest tlb, but Loongson-3 maintains all cache coherency by hardware (including multi-core coherency and I/O DMA coherency) so it prefers all guest mappings be cacheable mappings. Thus, we use root tlb to control guest's CCA for Loongson-3. Reviewed-by: Aleksandar Markovic Signed-off-by: Huacai Chen Co-developed-by: Jiaxun Yang --- arch/mips/kvm/vz.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c index 422cd06..f9fbbc16 100644 --- a/arch/mips/kvm/vz.c +++ b/arch/mips/kvm/vz.c @@ -2871,6 +2871,12 @@ static int kvm_vz_hardware_enable(void) if (cpu_has_guestctl2) clear_c0_guestctl2(0x3f << 10); +#ifdef CONFIG_CPU_LOONGSON64 + /* Control guest CCA attribute */ + if (cpu_has_csr()) + csr_writel(csr_readl(0xffffffec) | 0x1, 0xffffffec); +#endif + return 0; }