From patchwork Sat May 23 07:56:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huacai Chen X-Patchwork-Id: 11566663 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 90773138A for ; Sat, 23 May 2020 08:00:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 78FA320738 for ; Sat, 23 May 2020 08:00:38 +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="tTUrf1H5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387512AbgEWIAi (ORCPT ); Sat, 23 May 2020 04:00:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387500AbgEWIAi (ORCPT ); Sat, 23 May 2020 04:00:38 -0400 Received: from mail-pl1-x632.google.com (mail-pl1-x632.google.com [IPv6:2607:f8b0:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E3455C061A0E; Sat, 23 May 2020 01:00:37 -0700 (PDT) Received: by mail-pl1-x632.google.com with SMTP id k22so5338655pls.10; Sat, 23 May 2020 01:00:37 -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=tTUrf1H5rnnophyaxylgRFDHrou4WjrhVnSPC2fjSNC6IFVc9hFgDOC3jjMAZ/VZZ9 w2RNMD3KPLWX7feueewK8PzNgBvS1OUPp6UTGAf4xcBfULVB+Mskq8nQYxbfGEe0QO0u DlpF9ZB0k1mER+BDu6NSOEWt4OdETVZRJHae0U3mLuC1LTZ3SL5XHfaQ48gVCw7fY4pr JXL14TyD6PXxM+CGgrqOM+wqbyzjVwLzFM2VZNSvyzONJ1AX0ybjpfenTf7WW1H5kNF9 6JpUngFyGo3Xf2ID4S/p1FtTKhIe/TO71ehCUiTC7Y8tVcMMiBcuVtRKsm4GIm3aV7EH /6YA== 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=RP/UXgNgeM21IvhiPYRc8AuenF3mj449sMxeAqvgnmVjABj4P78Kddh4nabo6ARN+/ 1LoyDkB7HBHpsh8ZQG5r3zShqsslRwyv1cRdFYgQXjf2SZITRm6pLWar70q6klxKeQyS o+RYYOlEWfcIf1oj6wch2K35G6iaCWVKXdsUlqXr5EHfZ3A4iEJNti1/xOeVjOgW0es4 NRltqi2oaB2H3iWuwyw4ZUvCnMoAgrSlQEMmqlVEdo2UoqSPP00Bm6o5ZZYs+oCUW3So oOg7iXHwAQ6j8LT8rB1LatzeKm2kSBPzRwHI5T77DjCaG6OHi6K2Z1j7gGgcGlx0lftt NKQg== X-Gm-Message-State: AOAM532NUA8gSk5lg1xrAksNWLvxLWsl5LJ2C4k6DHjro+CGTShLATHz G12rpR8XjZTOYMuXm2mkhL0= X-Google-Smtp-Source: ABdhPJyS73kpDv8hCgy6gJqOqhbHyT+k0QQcvbEbKCG2urFflurBHI6iOEZd19af770FW2l3MmsmRg== X-Received: by 2002:a17:90a:23ab:: with SMTP id g40mr9029154pje.224.1590220837307; Sat, 23 May 2020 01:00:37 -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 w7sm678491pfu.117.2020.05.23.01.00.34 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 23 May 2020 01:00:36 -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 V7 07/15] KVM: MIPS: Use root tlb to control guest's CCA for Loongson-3 Date: Sat, 23 May 2020 15:56:34 +0800 Message-Id: <1590220602-3547-8-git-send-email-chenhc@lemote.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1590220602-3547-1-git-send-email-chenhc@lemote.com> References: <1590220602-3547-1-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; }