From patchwork Fri May 22 12:52:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirill A . Shutemov" X-Patchwork-Id: 11565565 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 5C536138A for ; Fri, 22 May 2020 12:52:36 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2B609206C3 for ; Fri, 22 May 2020 12:52:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=shutemov-name.20150623.gappssmtp.com header.i=@shutemov-name.20150623.gappssmtp.com header.b="GtiEZ4n1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2B609206C3 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=shutemov.name Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 59C8F8000D; Fri, 22 May 2020 08:52:23 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 550E480008; Fri, 22 May 2020 08:52:23 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 131D88000D; Fri, 22 May 2020 08:52:23 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0073.hostedemail.com [216.40.44.73]) by kanga.kvack.org (Postfix) with ESMTP id E44EC80008 for ; Fri, 22 May 2020 08:52:22 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id A9B8A181AEF31 for ; Fri, 22 May 2020 12:52:22 +0000 (UTC) X-FDA: 76844343324.13.alarm56_891eaa2a9d348 X-Spam-Summary: 2,0,0,e1fe8f367fb8c887,d41d8cd98f00b204,kirill@shutemov.name,,RULES_HIT:41:355:379:541:960:973:988:989:1260:1311:1314:1345:1359:1431:1437:1515:1534:1541:1711:1730:1747:1777:1792:2393:2559:2562:2736:3138:3139:3140:3141:3142:3352:3865:3867:3871:3874:4250:4321:5007:6119:6120:6261:6653:6742:7901:10004:11026:11658:11914:12043:12048:12296:12297:12517:12519:12555:12895:12986:13069:13161:13229:13311:13357:13894:14096:14181:14384:14721:21080:21433:21444:21451:21627:21990:30054:30062,0,RBL:209.85.208.194:@shutemov.name:.lbl8.mailshell.net-66.201.201.201 62.8.0.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:27,LUA_SUMMARY:none X-HE-Tag: alarm56_891eaa2a9d348 X-Filterd-Recvd-Size: 4803 Received: from mail-lj1-f194.google.com (mail-lj1-f194.google.com [209.85.208.194]) by imf26.hostedemail.com (Postfix) with ESMTP for ; Fri, 22 May 2020 12:52:22 +0000 (UTC) Received: by mail-lj1-f194.google.com with SMTP id l15so12122472lje.9 for ; Fri, 22 May 2020 05:52:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=TRTK9a5mpqTDY5ZfccpPpqg6MJ7UvrTh0xOAXZSLOT0=; b=GtiEZ4n19ouyAizgKUR7+QtiVY5GOsdnqMTjHrIb62L5xETehoiRwghxpTXWAFsud/ mzMElUVEBDDRWzoET4wNfdBr+wjaqzM/XIt1wcZOSbxfJkSXPhaXh78G/xODWbBkjHWI Ml2DHUVIQJ87N1mWdC9TF590bqRjFqLm61X3ZvCMq8khw6tLBA9ohicbe26vEv2hL8U5 4F9TmwyGNQDDzBo+XOMmQUHnWmvDEW6nCGxTzjxiqD3j423EdCtU2NM74RLdpHP02Q1T BbVYwG/7tf+sGDZcMWGVGYeXypePS7/N7EB2aXkxTZ+AwJIqmQ4ZMG6MMGqCPisBllWD ayxw== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=TRTK9a5mpqTDY5ZfccpPpqg6MJ7UvrTh0xOAXZSLOT0=; b=iQIqueq5komNRlDOKdkJdsNF2K+xh3Cb3Wzeacu15GZA377t/sk9fO7BFqxgvJVkdD tXS9SpzqnUiuTRBT7O35K8wdTyBKSoFyD0xhFuGnn2wVChgtSKd0BvjzPmP4mf6We7sv D3FlUkgftFNKO2Gl6q8Pzt3Yk6eF22jkZ/iOt7+9bdXp4Y1TvAs9v9R9c6DvPULiJZuX KrYGa+KMYSSNsmZXgJmcna4iIQx6+gVmqfna8bNNvskeO/5ipe/d+78g4H+pTxXgkNrP SeZ8rIiVarWuEmkMbZmiuwngGHi6S9jKL3nmL33BRriO5FaGTIXeGe6u0LjOmXGYWmf/ DdeQ== X-Gm-Message-State: AOAM532/GpmNP6F+q+r3KT5RhfruLYWWkX6tptRMJm18NQZqweW5Z7Sh wGMh6sG3CYqxioqEgY4DZXHjlA== X-Google-Smtp-Source: ABdhPJxgD8Uk4BEWMvgEPW1VD/uD+DbfKpa/h/WYtV9wQd/dZu3w9fynzecAsTLspWi1RmapCaP6QQ== X-Received: by 2002:a2e:9f43:: with SMTP id v3mr7757905ljk.285.1590151940948; Fri, 22 May 2020 05:52:20 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id n8sm2401340lfb.20.2020.05.22.05.52.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 May 2020 05:52:20 -0700 (PDT) From: "Kirill A. Shutemov" X-Google-Original-From: "Kirill A. Shutemov" Received: by box.localdomain (Postfix, from userid 1000) id C0A1C102053; Fri, 22 May 2020 15:52:19 +0300 (+03) To: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel Cc: David Rientjes , Andrea Arcangeli , Kees Cook , Will Drewry , "Edgecombe, Rick P" , "Kleen, Andi" , x86@kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [RFC 05/16] x86/kvm: Make VirtIO use DMA API in KVM guest Date: Fri, 22 May 2020 15:52:03 +0300 Message-Id: <20200522125214.31348-6-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200522125214.31348-1-kirill.shutemov@linux.intel.com> References: <20200522125214.31348-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 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: VirtIO for KVM is a primary way to provide IO. All memory that used for communication with the host has to be marked as shared. The easiest way to archive that is to use DMA API that already knows how to deal with shared memory. Signed-off-by: Kirill A. Shutemov --- drivers/virtio/virtio_ring.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 58b96baa8d48..bd9c56160107 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -12,6 +12,7 @@ #include #include #include +#include #ifdef DEBUG /* For development, we want to crash whenever the ring is screwed. */ @@ -255,6 +256,9 @@ static bool vring_use_dma_api(struct virtio_device *vdev) if (xen_domain()) return true; + if (kvm_mem_protected()) + return true; + return false; }