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 X-Spam-Level: X-Spam-Status: No, score=-4.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 72777C433ED for ; Mon, 3 May 2021 07:05:08 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2031E611C0 for ; Mon, 3 May 2021 07:05:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2031E611C0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=WweATAnaDte0lkBcuZK55M99X4vURHAhHRj0FXb1fwk=; b=aFyYMZZ1j9H23VeFnJVwRtgdC tlolmmshoNzvQ47d5sr7P6/2o+xtBjrK15URVSM5GSgTl4bByPDhlmMyp89mXZD8bt9AnVNw7P7+N ssrJQKO4lMHjcD0XpBhm3YaHcX9cIamJvkujdrV1ACqUoLSB/0kSpoPj6vbpKhH5SwQ2XqjPi9ylt 1C5TmWyqP4d2ENACrNbLx5VIY4QE5jIkuuhT7f5Hgtdpm1Slq9KZ5ePGms4ZfbbWykZJdf7PDK3Sh uVFiOKTKEcETojj9V1dOygttAgxiQ2gHVIl8q7kQMPHIsYajOk0HPpBhyJJ0Og39KVOjiHcBpAwwi R/1qClRxg==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1ldSb8-00DL1z-Td; Mon, 03 May 2021 07:02:31 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1ldSaQ-00DKxr-5t for linux-arm-kernel@desiato.infradead.org; Mon, 03 May 2021 07:01:51 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=EvzK/tNTFu6j7RpqReg+UsePxfTlwWDpS1m4nxob5S8=; b=d+fupqW0bciG3xsylg36LLTQ15 +QOOLEWa0exqDSIyE2RFjDoTQS5TD06FY0/1FfQh1XNyXHeFTsG9tyenVBVIqgjCBGawuG14FPPQb nlgJ4eujI3lzEMR10byAqYaaw88/xqIRqygJ5YIZ9PGkOsxhy0ki3ZQtW3ya69QlCjplaZenO46s3 CkePR34QF23Hm6BAF/3bUu0VKRE3N5IjTHEqDqDYFI3jHmEo9AfrGQSPCIGrZ0Y8/bi+X18cTDSU5 0b538F8+voZe0aZQuAYNWKR2ipPh29rG5HgUm/aggYZDfxdDlS/AZf2JS+8jK3UFDn0+WK/YHAl6N vR5rCHXw==; Received: from hch by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1ldSaF-00Elgh-Vf; Mon, 03 May 2021 07:01:37 +0000 Date: Mon, 3 May 2021 08:01:35 +0100 From: Christoph Hellwig To: Shanker Donthineni Cc: Marc Zyngier , Alex Williamson , Will Deacon , Catalin Marinas , Christoffer Dall , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Vikram Sethi , Jason Sequeira Subject: Re: [RFC 0/2] [RFC] Honor PCI prefetchable attributes for a virtual machine on ARM64 Message-ID: <20210503070135.GA3515187@infradead.org> References: <20210429162906.32742-1-sdonthineni@nvidia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210429162906.32742-1-sdonthineni@nvidia.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Apr 29, 2021 at 11:29:04AM -0500, Shanker Donthineni wrote: > Problem statement: Virtual machine crashes when NVIDIA GPU driver access a prefetchable BAR space due to the unaligned reads/writes for pass-through devices. The same binary works fine as expected in the host kernel. Only one BAR has control & status registers (CSR) and other PCI BARs are marked as prefetchable. NVIDIA GPU driver uses the write-combine feature for mapping the prefetchable BARs to improve performance. This problem applies to all other drivers which want to enable WC. Unless you mean the noveau drivers this simply does not matter. Please don't spam the kernel lists with issues with your broken and license violating drivers. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel