From patchwork Sun May 17 04:06:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huacai Chen X-Patchwork-Id: 11553887 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 BC89514B7 for ; Sun, 17 May 2020 04:08:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A4191207BB for ; Sun, 17 May 2020 04:08:25 +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="aAIfZrcw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726964AbgEQEIZ (ORCPT ); Sun, 17 May 2020 00:08:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725767AbgEQEIY (ORCPT ); Sun, 17 May 2020 00:08:24 -0400 Received: from mail-pg1-x541.google.com (mail-pg1-x541.google.com [IPv6:2607:f8b0:4864:20::541]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D9D3DC061A0C; Sat, 16 May 2020 21:08:24 -0700 (PDT) Received: by mail-pg1-x541.google.com with SMTP id u5so3039671pgn.5; Sat, 16 May 2020 21:08:24 -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=G0AgtVhRiXtYv7GiuMfsQdi40RXSl8uWCB+fvVpYccA=; b=aAIfZrcwAq/18CcUYGCaozun75Y6jk3SaEpYRXYv0rHzr/BwEQZOXBKPKHnm/OGGOT WRvg3pJWWq84MojM1xzyJUsABq/7UFwJjKLoqPfbSClxQqDHGhjHLTkKgBUpfmbBB1jq SBr5EQQI5OM3F2c9VBVWlrMWfZj+wtrh4Uy/YGWMI2ITpjawufOjRIKR4BKC1+Hphk1U +sLc2AHGSG0FfqsLNe3l19pbK6vLsmv9NUTu6UJ7n+i7p+byFImxu5YRq5+xHX5M772l pXSMY420bpD+TtekDjza4V5CKaj/vaFasQl9Y2+KXwl0KHtUZUanS333f8iCoGL4sCOB BhEg== 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=G0AgtVhRiXtYv7GiuMfsQdi40RXSl8uWCB+fvVpYccA=; b=jvAd5S6I7NLyIR+hiN5iXwowfaLZAyduKN06oWFPDlwSrczk9q8totUevUGim9v92c xh1WCfWLDWlcrHWvoHBxRdVSix25BN/x64ZecEj9wcV85ks+Bby3RRVyDBhcmUx/EsDF KGnFZgsEjqeISOnRP2jjHmNaWp3+WTC1mWdVNmqTo+kZXq3Y5JQ5j9L9HvYlmf660PvL jmTp88uvvt3bOBxwclFu3Me16GW2Rd8F5sOsoeqk9ccovM1wG0uGkStW509xjJlMSiVK axj6uPouhmoQ/Za4smhzWbYoCzFgZNT6/fY9M8OTkTJV05C5hoqAmvY6WhiWI/42UZq7 QYlg== X-Gm-Message-State: AOAM531WCrOh7VCOXBRNGBAWGWdloXvS2iTszzc4ID69nZoy+AFl71Pp s4+P09N0/YPkww1EiD2qIRM= X-Google-Smtp-Source: ABdhPJwacPjsy10gpl2YbHZkYjyjJrBghbjWtbpI/ofTCl2DKWEaFEZ1f0BaYOl/t8rlIQ+Qa/NerA== X-Received: by 2002:a63:145f:: with SMTP id 31mr1469721pgu.383.1589688504512; Sat, 16 May 2020 21:08:24 -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.29.2020.05.16.21.08.18 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 16 May 2020 21:08:23 -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 05/15] KVM: MIPS: Use lddir/ldpte instructions to lookup gpa_mm.pgd Date: Sun, 17 May 2020 12:06:02 +0800 Message-Id: <1589688372-3098-6-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: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Loongson-3 can use lddir/ldpte instuctions to accelerate page table walking, so use them to lookup gpa_mm.pgd. Reviewed-by: Aleksandar Markovic Signed-off-by: Huacai Chen Co-developed-by: Jiaxun Yang --- arch/mips/kvm/entry.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/mips/kvm/entry.c b/arch/mips/kvm/entry.c index 16e1c93..fd71694 100644 --- a/arch/mips/kvm/entry.c +++ b/arch/mips/kvm/entry.c @@ -56,6 +56,7 @@ #define C0_BADVADDR 8, 0 #define C0_BADINSTR 8, 1 #define C0_BADINSTRP 8, 2 +#define C0_PGD 9, 7 #define C0_ENTRYHI 10, 0 #define C0_GUESTCTL1 10, 4 #define C0_STATUS 12, 0 @@ -307,7 +308,10 @@ static void *kvm_mips_build_enter_guest(void *addr) #ifdef CONFIG_KVM_MIPS_VZ /* Save normal linux process pgd (VZ guarantees pgd_reg is set) */ - UASM_i_MFC0(&p, K0, c0_kscratch(), pgd_reg); + if (cpu_has_ldpte) + UASM_i_MFC0(&p, K0, C0_PWBASE); + else + UASM_i_MFC0(&p, K0, c0_kscratch(), pgd_reg); UASM_i_SW(&p, K0, offsetof(struct kvm_vcpu_arch, host_pgd), K1); /* @@ -469,8 +473,10 @@ void *kvm_mips_build_tlb_refill_exception(void *addr, void *handler) u32 *p = addr; struct uasm_label labels[2]; struct uasm_reloc relocs[2]; +#ifndef CONFIG_CPU_LOONGSON64 struct uasm_label *l = labels; struct uasm_reloc *r = relocs; +#endif memset(labels, 0, sizeof(labels)); memset(relocs, 0, sizeof(relocs)); @@ -490,6 +496,16 @@ void *kvm_mips_build_tlb_refill_exception(void *addr, void *handler) */ preempt_disable(); +#ifdef CONFIG_CPU_LOONGSON64 + UASM_i_MFC0(&p, K1, C0_PGD); + uasm_i_lddir(&p, K0, K1, 3); /* global page dir */ +#ifndef __PAGETABLE_PMD_FOLDED + uasm_i_lddir(&p, K1, K0, 1); /* middle page dir */ +#endif + uasm_i_ldpte(&p, K1, 0); /* even */ + uasm_i_ldpte(&p, K1, 1); /* odd */ + uasm_i_tlbwr(&p); +#else /* * Now for the actual refill bit. A lot of this can be common with the * Linux TLB refill handler, however we don't need to handle so many @@ -512,6 +528,7 @@ void *kvm_mips_build_tlb_refill_exception(void *addr, void *handler) build_get_ptep(&p, K0, K1); build_update_entries(&p, K0, K1); build_tlb_write_entry(&p, &l, &r, tlb_random); +#endif preempt_enable();