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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 57FA2C388F9 for ; Tue, 27 Oct 2020 08:44:29 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9A7A7207DE for ; Tue, 27 Oct 2020 08:44:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="uwVkm9dZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9A7A7207DE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1795C6B005C; Tue, 27 Oct 2020 04:44:28 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 14FAE6B005D; Tue, 27 Oct 2020 04:44:28 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F32536B0062; Tue, 27 Oct 2020 04:44:27 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0131.hostedemail.com [216.40.44.131]) by kanga.kvack.org (Postfix) with ESMTP id C81296B005C for ; Tue, 27 Oct 2020 04:44:27 -0400 (EDT) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 6A53C34A3 for ; Tue, 27 Oct 2020 08:44:27 +0000 (UTC) X-FDA: 77417068974.26.arch03_53165772727a Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin26.hostedemail.com (Postfix) with ESMTP id 4C4791804B655 for ; Tue, 27 Oct 2020 08:44:27 +0000 (UTC) X-HE-Tag: arch03_53165772727a X-Filterd-Recvd-Size: 2982 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf07.hostedemail.com (Postfix) with ESMTP for ; Tue, 27 Oct 2020 08:44:26 +0000 (UTC) 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=jmNJLBRCFdFXQCPDsbgJxCeg7OTT63Ved9ZS239LUkg=; b=uwVkm9dZG6qemWi1SUFtrghO8y U61seC3CjXBZ7FVApPCnMiEXJCSFrO9lQKMTHYIfUr9Y15LQGLCcbwOtZCWWC+SkmG8RD3nregZlH kiitudLOmiKoSMDkcfFvPQb6jgNt7RT75k+oQZNyu0kdR4f2Y5/Vde5PI0ld2a3pmmW/WyqruPh2z T8hXR7Pv6ajnvlYC45xSGFziuYv/skTWwThqP5D7d4RiekvuZst5EbXOyMB9/C6jF5mLzW6eym5ay +pvcFFcjgZ3QmJBlfJk+JydPksRC3QWLCdZGY6t3YUAhA1biP76jRuDxsqf5e10JjDNtZKhKTEWJw sXCX+sHg==; Received: from hch by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kXKaD-0002zC-6S; Tue, 27 Oct 2020 08:43:57 +0000 Date: Tue, 27 Oct 2020 08:43:57 +0000 From: Christoph Hellwig To: Jason Gunthorpe Cc: Tom Lendacky , x86@kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, Radim Kr??m???? , Arnd Bergmann , Matt Fleming , Konrad Rzeszutek Wilk , Andrey Ryabinin , Ingo Molnar , Borislav Petkov , Andy Lutomirski , "H. Peter Anvin" , Paolo Bonzini , Alexander Potapenko , Thomas Gleixner , Dmitry Vyukov , Rik van Riel , Larry Woodman , Dave Young , Toshimitsu Kani , "Michael S. Tsirkin" , Brijesh Singh Subject: Re: AMD SME encrpytion and PCI BAR pages to user space Message-ID: <20201027084357.GA10053@infradead.org> References: <20201019152556.GA560082@nvidia.com> <4b9f13bf-3f82-1aed-c7be-0eaecebc5d82@amd.com> <20201021115933.GS6219@nvidia.com> <20201021160322.GT6219@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201021160322.GT6219@nvidia.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Oct 21, 2020 at 01:03:22PM -0300, Jason Gunthorpe wrote: > Oh, interesting.. Yes the issue is no userspace DMA stuff uses the DMA > API correctly (because it is in userspace) > > So SWIOTLB tricks don't work, I wish the dma_map could fail for these > situations Userspace DMA by definition also does not use dma_map..