From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E03EAC021AA for ; Wed, 19 Feb 2025 09:34:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=GgWjzKl8pOIbbfF7ognkhTAU1FOv85XsHUlTnOyLHVQ=; b=GqImEVUxvwrAJ09I+pgVXIEAXW JGWX7Kp2b8mcsoPDrpu0A+7PBNW7ld8BHlGNbLIvy3ZmhXrFkAigzzGhnxHXd8kfkb18AJyAhrO7m 7+MIq0t0vwSoFE1lSORKwO5PA4tcKMt4ff0JAubDu3OexJAMwMwU0JnYm6A6OYaWw+gtkKPYSy7aP kBFMAI+8kudZMtVjDLVXiFmgAF0Ht3vapKLZYuElREnj7gtzcI8+ch4GyW2Lx6mQrCJs1lpuIl6PU kTpS9jI7clRnquouTxgpCDK5xxlIyKQttLXHb2bZN2I+YCLSVUbSFDCpvu7RzNJsr5XSduvz4OopM fdja4WwQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tkgTF-0000000Btra-3l5B; Wed, 19 Feb 2025 09:34:21 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tkfsh-0000000BgT7-0XLq for linux-arm-kernel@lists.infradead.org; Wed, 19 Feb 2025 08:56:36 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 003F11682; Wed, 19 Feb 2025 00:56:53 -0800 (PST) Received: from [10.162.42.6] (unknown [10.162.42.6]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4EF9A3F5A1; Wed, 19 Feb 2025 00:56:21 -0800 (PST) Message-ID: <5fbfd74e-7f87-4f4f-86a7-7d4c38e0b4ba@arm.com> Date: Wed, 19 Feb 2025 14:26:19 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 3/4] arm64: hugetlb: Fix flush_hugetlb_tlb_range() invalidation level To: Ryan Roberts , Catalin Marinas , Will Deacon , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Gerald Schaefer , "David S. Miller" , Andreas Larsson , Arnd Bergmann , Muchun Song , Andrew Morton , Uladzislau Rezki , Christoph Hellwig , David Hildenbrand , "Matthew Wilcox (Oracle)" , Mark Rutland , Dev Jain , Kevin Brodsky , Alexandre Ghiti Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20250217140419.1702389-1-ryan.roberts@arm.com> <20250217140419.1702389-4-ryan.roberts@arm.com> Content-Language: en-US From: Anshuman Khandual In-Reply-To: <20250217140419.1702389-4-ryan.roberts@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250219_005635_287160_A26354CA X-CRM114-Status: GOOD ( 19.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2/17/25 19:34, Ryan Roberts wrote: > commit c910f2b65518 ("arm64/mm: Update tlb invalidation routines for > FEAT_LPA2") changed the "invalidation level unknown" hint from 0 to > TLBI_TTL_UNKNOWN (INT_MAX). But the fallback "unknown level" path in > flush_hugetlb_tlb_range() was not updated. So as it stands, when trying > to invalidate CONT_PMD_SIZE or CONT_PTE_SIZE hugetlb mappings, we will > spuriously try to invalidate at level 0 on LPA2-enabled systems. > > Fix this so that the fallback passes TLBI_TTL_UNKNOWN, and while we are > at it, explicitly use the correct stride and level for CONT_PMD_SIZE and > CONT_PTE_SIZE, which should provide a minor optimization. > > Cc: stable@vger.kernel.org > Fixes: c910f2b65518 ("arm64/mm: Update tlb invalidation routines for FEAT_LPA2") > Signed-off-by: Ryan Roberts LGTM Reviewed-by: Anshuman Khandual > --- > arch/arm64/include/asm/hugetlb.h | 22 ++++++++++++++++------ > 1 file changed, 16 insertions(+), 6 deletions(-) > > diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h > index 03db9cb21ace..07fbf5bf85a7 100644 > --- a/arch/arm64/include/asm/hugetlb.h > +++ b/arch/arm64/include/asm/hugetlb.h > @@ -76,12 +76,22 @@ static inline void flush_hugetlb_tlb_range(struct vm_area_struct *vma, > { > unsigned long stride = huge_page_size(hstate_vma(vma)); > > - if (stride == PMD_SIZE) > - __flush_tlb_range(vma, start, end, stride, false, 2); > - else if (stride == PUD_SIZE) > - __flush_tlb_range(vma, start, end, stride, false, 1); > - else > - __flush_tlb_range(vma, start, end, PAGE_SIZE, false, 0); > + switch (stride) { > +#ifndef __PAGETABLE_PMD_FOLDED > + case PUD_SIZE: > + __flush_tlb_range(vma, start, end, PUD_SIZE, false, 1); > + break; > +#endif > + case CONT_PMD_SIZE: > + case PMD_SIZE: > + __flush_tlb_range(vma, start, end, PMD_SIZE, false, 2); > + break; > + case CONT_PTE_SIZE: > + __flush_tlb_range(vma, start, end, PAGE_SIZE, false, 3); > + break; > + default: > + __flush_tlb_range(vma, start, end, PAGE_SIZE, false, TLBI_TTL_UNKNOWN); > + } > } > > #endif /* __ASM_HUGETLB_H */