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=-8.2 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,USER_AGENT_SANE_1 autolearn=ham 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 1FAF0C5DF60 for ; Wed, 6 Nov 2019 01:59:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B497221D7C for ; Wed, 6 Nov 2019 01:59:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ozlabs-ru.20150623.gappssmtp.com header.i=@ozlabs-ru.20150623.gappssmtp.com header.b="rPmKdpKl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730881AbfKFB7B (ORCPT ); Tue, 5 Nov 2019 20:59:01 -0500 Received: from mail-pg1-f195.google.com ([209.85.215.195]:37772 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730687AbfKFB7B (ORCPT ); Tue, 5 Nov 2019 20:59:01 -0500 Received: by mail-pg1-f195.google.com with SMTP id z24so11453056pgu.4 for ; Tue, 05 Nov 2019 17:58:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ozlabs-ru.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:autocrypt:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=nHPCmBhzOXMTMaAkrexHD/oJ06s+K/vSclTmn73DQoI=; b=rPmKdpKlJKcfe3nozueNDoygPG3IubCYR9wADRZkaUXHDz5sTRyQ7iPeFcMl1Etiba K+VhSdReUZSXI5N3MhXgPlafKMPEKFvwfS/iRG/UU5l1IsKqBPa2iSW+ue32VpLTzG2u /OtlyLDECkqeamhu4FcuaNzJ06avITLpBms78hQMmkRhkX29Oa7g8jFqnC7fZoqftlJb qSBJ3FvUMhCOJTYEmo4j4ynBIg9xwIqTgaAdy4wGBCB77l1Eh49mEhpr7vp72TcpNctR EIuUfe8xMtEy9i/JeHowE635fNZjuydl2cqJtgvQKqDxCx3yKgjnsSHYF9VUo8yLqEMO Nd2w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=nHPCmBhzOXMTMaAkrexHD/oJ06s+K/vSclTmn73DQoI=; b=IUVILR5CqnEDCFLcWeBFcEG+fHlZMsXNw5N3tFuejZbOsAS2NafzwpXTyPbc04+F4z 4W+UAxqVxxen9k03fRzujVnKqH2kbDv29/+xUN4geCThfXy/dyzp9Rnyz614ubI6TgHR TTfUnO//8WqFp7kov8FD2VsllpdMCtOduGCKGl9F84aWc84qmVID7X7cYdynVGJ2P4Vb Kx9rkdvtPPfwvxouQdbAmf624rL0WSgzCf1WsfZ7SVPx7Gb+RdCmK6VQLbveLUDaXq5H TTKfJROp1b9XwhREvAz6vLIHP5k7h+p26sbyScYwJ5Wbfr3jRb7Jrz8MButxZY4/qw8k GuWw== X-Gm-Message-State: APjAAAXPZulS3f52MPKDiUpdSS+H3iibEXzTtMTzRX51WSt170hImJw8 fHliCoVOypk4w0gTD5w6kGRUn8FSE6Q= X-Google-Smtp-Source: APXvYqxGja+KxkHw3fVkuwtyCCd5HmSmZh27e2FmPb5A+/sdsZMhTqUWwQdXF7C3hp7d/iHLbiIViA== X-Received: by 2002:a17:90a:4fe6:: with SMTP id q93mr284516pjh.88.1573005538174; Tue, 05 Nov 2019 17:58:58 -0800 (PST) Received: from [10.61.2.175] ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id 70sm21869942pfw.160.2019.11.05.17.58.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Nov 2019 17:58:57 -0800 (PST) Subject: Re: [RFC v1 1/2] powerpc/pseries/iommu: Share the per-cpu TCE page with the hypervisor. To: Ram Pai , linuxppc-dev@lists.ozlabs.org Cc: benh@kernel.crashing.org, david@gibson.dropbear.id.au, mpe@ellerman.id.au, paulus@ozlabs.org, mdroth@linux.vnet.ibm.com, hch@lst.de, andmike@us.ibm.com, sukadev@linux.vnet.ibm.com, mst@redhat.com, ram.n.pai@gmail.com, cai@lca.pw, tglx@linutronix.de, bauerman@linux.ibm.com, linux-kernel@vger.kernel.org References: <1572902923-8096-1-git-send-email-linuxram@us.ibm.com> <1572902923-8096-2-git-send-email-linuxram@us.ibm.com> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 t847eFaVKI/6WcxhszI0R6Cj+N4y+1rHfkGWYWupCiHwj9DjILW9iEAncVgQmkNPpUsZECLT 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XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: Date: Wed, 6 Nov 2019 12:58:50 +1100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.1 MIME-Version: 1.0 In-Reply-To: <1572902923-8096-2-git-send-email-linuxram@us.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/11/2019 08:28, Ram Pai wrote: > The hypervisor needs to access the contents of the page holding the TCE > entries while setting up the TCE entries in the IOMMU's TCE table. For > SecureVMs, since this page is encrypted, the hypervisor cannot access > valid entries. Share the page with the hypervisor. This ensures that the > hypervisor sees the valid entries. > > Signed-off-by: Ram Pai > --- > arch/powerpc/platforms/pseries/iommu.c | 20 +++++++++++++++++--- > 1 file changed, 17 insertions(+), 3 deletions(-) > > diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c > index 8d9c2b1..07f0847 100644 > --- a/arch/powerpc/platforms/pseries/iommu.c > +++ b/arch/powerpc/platforms/pseries/iommu.c > @@ -37,6 +37,7 @@ > #include > #include > #include > +#include > > #include "pseries.h" > > @@ -179,6 +180,19 @@ static int tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum, > > static DEFINE_PER_CPU(__be64 *, tce_page); > > +/* > + * Allocate a tce page. If secure VM, share the page with the hypervisor. > + */ > +static __be64 *alloc_tce_page(void) > +{ > + __be64 *tcep = (__be64 *)__get_free_page(GFP_ATOMIC); > + > + if (tcep && is_secure_guest()) > + uv_share_page(PHYS_PFN(__pa(tcep)), 1); There is no matching unshare in this patch. > + > + return tcep; > +} > + > static int tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum, > long npages, unsigned long uaddr, > enum dma_data_direction direction, > @@ -206,8 +220,7 @@ static int tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum, > * from iommu_alloc{,_sg}() > */ > if (!tcep) { > - tcep = (__be64 *)__get_free_page(GFP_ATOMIC); > - /* If allocation fails, fall back to the loop implementation */ > + tcep = alloc_tce_page(); > if (!tcep) { > local_irq_restore(flags); > return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr, > @@ -391,6 +404,7 @@ static int tce_clearrange_multi_pSeriesLP(unsigned long start_pfn, > return rc; > } > > + Unrelated. > static int tce_setrange_multi_pSeriesLP(unsigned long start_pfn, > unsigned long num_pfn, const void *arg) > { > @@ -405,7 +419,7 @@ static int tce_setrange_multi_pSeriesLP(unsigned long start_pfn, > tcep = __this_cpu_read(tce_page); > > if (!tcep) { > - tcep = (__be64 *)__get_free_page(GFP_ATOMIC); > + tcep = alloc_tce_page(); > if (!tcep) { > local_irq_enable(); > return -ENOMEM; > -- Alexey