From patchwork Sat May 23 16:41:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Souptick Joarder X-Patchwork-Id: 11566847 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 EE83460D for ; Sat, 23 May 2020 16:35:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C569C20787 for ; Sat, 23 May 2020 16:35:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="awwC905D" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728255AbgEWQf3 (ORCPT ); Sat, 23 May 2020 12:35:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42324 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728044AbgEWQf3 (ORCPT ); Sat, 23 May 2020 12:35:29 -0400 Received: from mail-pf1-x441.google.com (mail-pf1-x441.google.com [IPv6:2607:f8b0:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2D827C061A0E; Sat, 23 May 2020 09:35:29 -0700 (PDT) Received: by mail-pf1-x441.google.com with SMTP id x13so6618155pfn.11; Sat, 23 May 2020 09:35:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=SPwvsl09hB2hY7vOwt/I7H2rDDPUmLEvYZeiYLVmTxA=; b=awwC905DtOmsRxPl9VpH7xse2oOvoTCwphi2JL9ipFHZ1tJfd2S3NMEaTEM2Gtid7J G5XUB+7fUbIm7nd4HHwIi7YjHrQTbTarVbq+mjfpH1d2MouOlJhT6ZYgmWbrhan+4tcK mV7VS5kkri+kgMAFJEUD483avv0CzqKdHRTmU+6DzkWYspweoc6qfZs626ny01vuWKwX eyatucxyWAEgDQ2tjtcOHP+neHco2CfvWPXtBor1Y4x/1YUI7L6RE/pmXnsuIofRXH/V rxwLSQ96hZ8aciMBZ3t3Mx+Gm0Lec2sr0HwxytIAb7E8r2r1JTK9U4+anDWKzyypwA/A u7Gg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=SPwvsl09hB2hY7vOwt/I7H2rDDPUmLEvYZeiYLVmTxA=; b=PU9KJWebYft4nHuFxgJoLVzG2M4gZSkzIArg7frUs+7WX/8Qu3akOQslc8RfLwrEHR GdTGl51Li5D9Ad1wzVZenWqD4O6HfCwQGCq0onN8GF2Hjtwi2J0IaVsMvbi5hL1RGMUA urTySZw8lhnkfBooDrQoaeS3nlRDE3UPny6lRRTr2f4y+Y02K3190QamKBsWTlE3lRg9 uCV0LiUnXmhX5rlvE3gc5CNvreUO8ZayffqcCYRpRrSdnh42K6Ea61F0P2MuAAqD4ODc YZyT7f546o0rHFwj5EoOJc3+ZLsKsMsZgS/M43mz9mwduEu5x00hjQT9apZnyeolHzLw i1CQ== X-Gm-Message-State: AOAM530bj4JJ7BLYzm1bNONkRgrsO0mUIYUOLYA91a+EGTyQr/I9U6fR cM1hkuidvOXCtPZq7P1gbGw= X-Google-Smtp-Source: ABdhPJw+IhCIgVWqU4NAcraQunQOd43jmSnfk7GPbMKu7X2WVjajeWatsEAUCznsi/qFfbfvnJ+yLg== X-Received: by 2002:a65:6496:: with SMTP id e22mr759651pgv.63.1590251728535; Sat, 23 May 2020 09:35:28 -0700 (PDT) Received: from jordon-HP-15-Notebook-PC.domain.name ([122.166.90.90]) by smtp.gmail.com with ESMTPSA id b74sm8415460pga.31.2020.05.23.09.35.21 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 23 May 2020 09:35:27 -0700 (PDT) From: Souptick Joarder To: paulus@ozlabs.org, mpe@ellerman.id.au, benh@kernel.crashing.org, akpm@linux-foundation.org, peterz@infradead.org, mingo@redhat.com, acme@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, namhyung@kernel.org, pbonzini@redhat.com, sfr@canb.auug.org.au, rppt@linux.ibm.com, msuchanek@suse.de, aneesh.kumar@linux.ibm.com Cc: kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, Souptick Joarder , John Hubbard , Matthew Wilcox Subject: [linux-next RFC] mm/gup.c: Convert to use get_user_pages_fast_only() Date: Sat, 23 May 2020 22:11:12 +0530 Message-Id: <1590252072-2793-1-git-send-email-jrdr.linux@gmail.com> X-Mailer: git-send-email 1.9.1 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Renaming the API __get_user_pages_fast() to get_user_pages_ fast_only() to align with pin_user_pages_fast_only(). As part of this we will get rid of write parameter. Instead caller will pass FOLL_WRITE to get_user_pages_fast_only(). This will not change any existing functionality of the API. All the callers are changed to pass FOLL_WRITE. Updated the documentation of the API. Signed-off-by: Souptick Joarder Cc: John Hubbard Cc: Matthew Wilcox --- arch/powerpc/kvm/book3s_64_mmu_hv.c | 2 +- arch/powerpc/kvm/book3s_64_mmu_radix.c | 2 +- arch/powerpc/perf/callchain_64.c | 2 +- include/linux/mm.h | 4 ++-- kernel/events/core.c | 4 ++-- mm/gup.c | 29 ++++++++++++++++------------- virt/kvm/kvm_main.c | 6 +++--- 7 files changed, 26 insertions(+), 23 deletions(-) diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 18aed97..34fc5c8 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -581,7 +581,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, * We always ask for write permission since the common case * is that the page is writable. */ - if (__get_user_pages_fast(hva, 1, 1, &page) == 1) { + if (get_user_pages_fast_only(hva, 1, FOLL_WRITE, &page) == 1) { write_ok = true; } else { /* Call KVM generic code to do the slow-path check */ diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c index 3248f78..3b6e342 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -795,7 +795,7 @@ int kvmppc_book3s_instantiate_page(struct kvm_vcpu *vcpu, * is that the page is writable. */ hva = gfn_to_hva_memslot(memslot, gfn); - if (!kvm_ro && __get_user_pages_fast(hva, 1, 1, &page) == 1) { + if (!kvm_ro && get_user_pages_fast_only(hva, 1, FOLL_WRITE, &page) == 1) { upgrade_write = true; } else { unsigned long pfn; diff --git a/arch/powerpc/perf/callchain_64.c b/arch/powerpc/perf/callchain_64.c index 1bff896d..f719a74 100644 --- a/arch/powerpc/perf/callchain_64.c +++ b/arch/powerpc/perf/callchain_64.c @@ -32,7 +32,7 @@ int read_user_stack_slow(void __user *ptr, void *buf, int nb) int nrpages; void *kaddr; - nrpages = __get_user_pages_fast(addr, 1, 1, &page); + nrpages = get_user_pages_fast_only(addr, 1, FOLL_WRITE, &page); if (nrpages == 1) { kaddr = page_address(page); diff --git a/include/linux/mm.h b/include/linux/mm.h index 93d93bd..10a6758 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1817,8 +1817,8 @@ extern int mprotect_fixup(struct vm_area_struct *vma, /* * doesn't attempt to fault and will return short. */ -int __get_user_pages_fast(unsigned long start, int nr_pages, int write, - struct page **pages); +int get_user_pages_fast_only(unsigned long start, int nr_pages, + unsigned int gup_flags, struct page **pages); int pin_user_pages_fast_only(unsigned long start, int nr_pages, unsigned int gup_flags, struct page **pages); /* diff --git a/kernel/events/core.c b/kernel/events/core.c index c94eb27..81d6e73 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6934,12 +6934,12 @@ static u64 perf_virt_to_phys(u64 virt) * Walking the pages tables for user address. * Interrupts are disabled, so it prevents any tear down * of the page tables. - * Try IRQ-safe __get_user_pages_fast first. + * Try IRQ-safe get_user_pages_fast_only first. * If failed, leave phys_addr as 0. */ if (current->mm != NULL) { pagefault_disable(); - if (__get_user_pages_fast(virt, 1, 0, &p) == 1) + if (get_user_pages_fast_only(virt, 1, 0, &p) == 1) phys_addr = page_to_phys(p) + virt % PAGE_SIZE; pagefault_enable(); } diff --git a/mm/gup.c b/mm/gup.c index 80f51a36..d8aabc0 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2278,7 +2278,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, * to be special. * * For a futex to be placed on a THP tail page, get_futex_key requires a - * __get_user_pages_fast implementation that can pin pages. Thus it's still + * get_user_pages_fast_only implementation that can pin pages. Thus it's still * useful to have gup_huge_pmd even if we can't operate on ptes. */ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, @@ -2683,7 +2683,7 @@ static inline void gup_pgd_range(unsigned long addr, unsigned long end, #ifndef gup_fast_permitted /* - * Check if it's allowed to use __get_user_pages_fast() for the range, or + * Check if it's allowed to use get_user_pages_fast_only() for the range, or * we need to fall back to the slow version: */ static bool gup_fast_permitted(unsigned long start, unsigned long end) @@ -2776,8 +2776,14 @@ static int internal_get_user_pages_fast(unsigned long start, int nr_pages, return ret; } - -/* +/** + * get_user_pages_fast_only() - pin user pages in memory + * @start: starting user address + * @nr_pages: number of pages from start to pin + * @gup_flags: flags modifying pin behaviour + * @pages: array that receives pointers to the pages pinned. + * Should be at least nr_pages long. + * * Like get_user_pages_fast() except it's IRQ-safe in that it won't fall back to * the regular GUP. * Note a difference with get_user_pages_fast: this always returns the @@ -2786,8 +2792,8 @@ static int internal_get_user_pages_fast(unsigned long start, int nr_pages, * If the architecture does not support this function, simply return with no * pages pinned. */ -int __get_user_pages_fast(unsigned long start, int nr_pages, int write, - struct page **pages) +int get_user_pages_fast_only(unsigned long start, int nr_pages, + unsigned int gup_flags, struct page **pages) { int nr_pinned; /* @@ -2797,10 +2803,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write, * FOLL_FAST_ONLY is required in order to match the API description of * this routine: no fall back to regular ("slow") GUP. */ - unsigned int gup_flags = FOLL_GET | FOLL_FAST_ONLY; - - if (write) - gup_flags |= FOLL_WRITE; + gup_flags = FOLL_GET | FOLL_FAST_ONLY; nr_pinned = internal_get_user_pages_fast(start, nr_pages, gup_flags, pages); @@ -2815,7 +2818,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write, return nr_pinned; } -EXPORT_SYMBOL_GPL(__get_user_pages_fast); +EXPORT_SYMBOL_GPL(get_user_pages_fast_only); /** * get_user_pages_fast() - pin user pages in memory @@ -2886,8 +2889,8 @@ int pin_user_pages_fast(unsigned long start, int nr_pages, EXPORT_SYMBOL_GPL(pin_user_pages_fast); /* - * This is the FOLL_PIN equivalent of __get_user_pages_fast(). Behavior is the - * same, except that this one sets FOLL_PIN instead of FOLL_GET. + * This is the FOLL_PIN equivalent of get_user_pages_fast_only(). Behavior + * is the same, except that this one sets FOLL_PIN instead of FOLL_GET. * * The API rules are the same, too: no negative values may be returned. */ diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index fc38d63..cec7919 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1750,7 +1750,7 @@ static bool hva_to_pfn_fast(unsigned long addr, bool write_fault, if (!(write_fault || writable)) return false; - npages = __get_user_pages_fast(addr, 1, 1, page); + npages = get_user_pages_fast_only(addr, 1, FOLL_WRITE, page); if (npages == 1) { *pfn = page_to_pfn(page[0]); @@ -1791,7 +1791,7 @@ static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, if (unlikely(!write_fault) && writable) { struct page *wpage; - if (__get_user_pages_fast(addr, 1, 1, &wpage) == 1) { + if (get_user_pages_fast_only(addr, 1, FOLL_WRITE, &wpage) == 1) { *writable = true; put_page(page); page = wpage; @@ -1998,7 +1998,7 @@ int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, if (entry < nr_pages) return 0; - return __get_user_pages_fast(addr, nr_pages, 1, pages); + return get_user_pages_fast(addr, nr_pages, FOLL_WRITE, pages); } EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);