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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 D445AC433DF for ; Fri, 22 May 2020 12:53:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B3CAF2072C for ; Fri, 22 May 2020 12:53:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=shutemov-name.20150623.gappssmtp.com header.i=@shutemov-name.20150623.gappssmtp.com header.b="j6Temqp5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729890AbgEVMwZ (ORCPT ); Fri, 22 May 2020 08:52:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729805AbgEVMwV (ORCPT ); Fri, 22 May 2020 08:52:21 -0400 Received: from mail-lj1-x243.google.com (mail-lj1-x243.google.com [IPv6:2a00:1450:4864:20::243]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E50DC05BD43 for ; Fri, 22 May 2020 05:52:21 -0700 (PDT) Received: by mail-lj1-x243.google.com with SMTP id k5so12452105lji.11 for ; Fri, 22 May 2020 05:52:21 -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=YzqQsjWsD3KM16gewdvtpsRwCFP82zpuuyGt2UtUvco=; b=j6Temqp5EdCwy2lHEeBRNU/roZu6P35IXqFKlgDFfcRBuTYSUzvoVVn3YuRD/rx9VD A/33zGrbtZ5asrkQE65MmYaLJtBAEY84pZxygcVD/NIjWPOHi2M0V+WECH/S/BiPQcjj ye0nW3hVLvZJ9O5MEjEmTV62uQQDzHRq2b2l05cYTQowGXzbX7D6xJuXQOctBQIUszcW svrImc0ptd9lZd1snb+8vxKeIxuW1Zu0t9X2Cwq5D2IKtwHlftfhGib5sGsFpuwYWQp7 imBMkbE7Z20hpw2drt92fqwRw+0cXJIXL8sTiwxb11wDDXa/PIa0fbCDv1b2cCqwzOGa hvwg== 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=YzqQsjWsD3KM16gewdvtpsRwCFP82zpuuyGt2UtUvco=; b=cxgPn7dNA3p41Mhrom4cVCF2PYn7JF7Qwp2RocuVqUZxdXUhFAEBqwtAFnWMU+l1ot 4mylzKlYLnAv/mEiZNJ6qfGNSPudeKltHatIJbDj7PZOGs3h3tApPDlEuCvxEI4hmc4D B6G9SG3SBWaYbG/KjZUrGZVyS7Iuduvro4cjDNvghwh9XJedqZiV7jevSgtfzY4N6wqm fJVtlrmPubmJnASI5z0zNZIZG5eIVRtC99lT5Q1wscBcfulc0g0DHCJoCZvw9FhcQZIj B4A9+qx4TVT9GH+iDkP0YQmciwapaojV2s01SA1t0k2muQAaDrhFG3/ScXGBDWL+3EPa WSMQ== X-Gm-Message-State: AOAM533izF5FKckzpJEQvYUMvTvaIlD3EwTpPG0Mb/f6jdkhk+mb3uws U9H7vpKj4GG6hgi/aPEz5IgVnQ== X-Google-Smtp-Source: ABdhPJysUi0S/B10wTzt4/F1rMdfE2sKWbCTwK5LOYcv3t2ygEQAFnn1cMIJjclfQZFWD15ToOwdhA== X-Received: by 2002:a2e:9a41:: with SMTP id k1mr7755117ljj.143.1590151939515; Fri, 22 May 2020 05:52:19 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id y21sm428982ljg.48.2020.05.22.05.52.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 May 2020 05:52:17 -0700 (PDT) From: "Kirill A. Shutemov" X-Google-Original-From: "Kirill A. Shutemov" Received: by box.localdomain (Postfix, from userid 1000) id B146A10204F; 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 03/16] x86/kvm: Make DMA pages shared Date: Fri, 22 May 2020 15:52:01 +0300 Message-Id: <20200522125214.31348-4-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 Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Make force_dma_unencrypted() return true for KVM to get DMA pages mapped as shared. __set_memory_enc_dec() now informs the host via hypercall if the state of the page has changed from shared to private or back. Signed-off-by: Kirill A. Shutemov --- arch/x86/Kconfig | 1 + arch/x86/mm/mem_encrypt_common.c | 5 +++-- arch/x86/mm/pat/set_memory.c | 7 +++++++ include/uapi/linux/kvm_para.h | 2 ++ 4 files changed, 13 insertions(+), 2 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index bc72bfd89bcf..86c012582f51 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -799,6 +799,7 @@ config KVM_GUEST depends on PARAVIRT select PARAVIRT_CLOCK select ARCH_CPUIDLE_HALTPOLL + select X86_MEM_ENCRYPT_COMMON default y ---help--- This option enables various optimizations for running under the KVM diff --git a/arch/x86/mm/mem_encrypt_common.c b/arch/x86/mm/mem_encrypt_common.c index 964e04152417..a878e7f246d5 100644 --- a/arch/x86/mm/mem_encrypt_common.c +++ b/arch/x86/mm/mem_encrypt_common.c @@ -10,14 +10,15 @@ #include #include #include +#include /* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */ bool force_dma_unencrypted(struct device *dev) { /* - * For SEV, all DMA must be to unencrypted/shared addresses. + * For SEV and KVM, all DMA must be to unencrypted/shared addresses. */ - if (sev_active()) + if (sev_active() || kvm_mem_protected()) return true; /* diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index b8c55a2e402d..6f075766bb94 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -1972,6 +1973,12 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) struct cpa_data cpa; int ret; + if (kvm_mem_protected()) { + unsigned long gfn = __pa(addr) >> PAGE_SHIFT; + int call = enc ? KVM_HC_MEM_UNSHARE : KVM_HC_MEM_SHARE; + return kvm_hypercall2(call, gfn, numpages); + } + /* Nothing to do if memory encryption is not active */ if (!mem_encrypt_active()) return 0; diff --git a/include/uapi/linux/kvm_para.h b/include/uapi/linux/kvm_para.h index 1a216f32e572..c6d8c988e330 100644 --- a/include/uapi/linux/kvm_para.h +++ b/include/uapi/linux/kvm_para.h @@ -30,6 +30,8 @@ #define KVM_HC_SEND_IPI 10 #define KVM_HC_SCHED_YIELD 11 #define KVM_HC_ENABLE_MEM_PROTECTED 12 +#define KVM_HC_MEM_SHARE 13 +#define KVM_HC_MEM_UNSHARE 14 /* * hypercalls use architecture specific -- 2.26.2