From patchwork Sun May 30 15:06:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 12288325 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 C4712C4726C for ; Sun, 30 May 2021 15:07:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 822B3611CE for ; Sun, 30 May 2021 15:07:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230109AbhE3PIp (ORCPT ); Sun, 30 May 2021 11:08:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45666 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230010AbhE3PIh (ORCPT ); Sun, 30 May 2021 11:08:37 -0400 Received: from mail-pg1-x52c.google.com (mail-pg1-x52c.google.com [IPv6:2607:f8b0:4864:20::52c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F0CADC0613ED; Sun, 30 May 2021 08:06:53 -0700 (PDT) Received: by mail-pg1-x52c.google.com with SMTP id j12so6427089pgh.7; Sun, 30 May 2021 08:06:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=M1xVjAHigQsVBryVftpCCjvg81+wOTUQfr50wSa0z0o=; b=sNrdoZzEG12p5juMA3jBGdhwekq2aogyv4cWLt3Q9FFTt7/sBUDijWvM58X66976BO kJv1GfqQauUiQ6UDwB4KHSHKbqJdsTij6qKiS0I1JyaL90iuEOJ7P6aw8mucrerUw4kZ ynS7ThiT7E4/MDPzHnf4KZGFeGtrUHktekJ3Mt5GvomdItXJaCyBS0do306K1hhxXMvs vsFRVkYt5+hsjyFrhhoRTY51WzHW2c3gzdOCyN9MeS3XIsh08U9XZ1UHO+ZUZlEe0ZZh UW0FBTRMxa8o7owQlLms0NBS25OrbKF7Oojybmwzo1E4d4fQhPlIDfgLBDz6BGXt3erV 1vmA== 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=M1xVjAHigQsVBryVftpCCjvg81+wOTUQfr50wSa0z0o=; b=t9N7EnhwGTPbXPwCukm1FGQ/dwQ+DdQPjdKdMUoq6lC+U9vr6lnPA9LkfYUTYQzZa0 eIoq+CkCCkaJgyg5ZqVf+dwA+14NJzoOjZWjx6igrk8d27PN9HL59cnQIIcCVCDZsrio daCWqeAfZyExP2NVwxuUAFLaH0ISl7klro1mZg7qiBE4YfVGsLdQvya50wuGJCHYSQUZ l7vD5zazXibb1ZbJ1nJq0lAB3K2GRpCFGkw2g3A+kR+knle6HVOhkIfcPKVwOZdhOnsE gExHjguKrcTiFaAyiKI6evc9ibZFMMCh84OFD/7pzmq+TWni19cP9DvvFY4p3T2znRr/ 9eLg== X-Gm-Message-State: AOAM533nfoMe1EQjG2m+bI/frBh/oh4nS7OqSTG/RXCbwAeZpkPR8GBO 1CBpiBqeiwfgjL2imEaZB3c= X-Google-Smtp-Source: ABdhPJziJtspWVCmOHJqaVbfIhz+FLD7bwtV5SoxX2/+91foGt0Wvcd+JVLZUDMoLpg47iIDkrNTHQ== X-Received: by 2002:a05:6a00:1c6b:b029:2e2:caff:13fa with SMTP id s43-20020a056a001c6bb02902e2caff13famr12601991pfw.59.1622387213561; Sun, 30 May 2021 08:06:53 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:9:dc2d:80ab:c3f3:1524]) by smtp.gmail.com with ESMTPSA id b15sm8679688pfi.100.2021.05.30.08.06.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 30 May 2021 08:06:53 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, rppt@kernel.org, hannes@cmpxchg.org, cai@lca.pw, krish.sadhukhan@oracle.com, saravanand@fb.com, Tianyu.Lan@microsoft.com, konrad.wilk@oracle.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, xen-devel@lists.xenproject.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com Subject: [RFC PATCH V3 11/11] HV/Storvsc: Add Isolation VM support for storvsc driver Date: Sun, 30 May 2021 11:06:28 -0400 Message-Id: <20210530150628.2063957-12-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210530150628.2063957-1-ltykernel@gmail.com> References: <20210530150628.2063957-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan In Isolation VM, all shared memory with host needs to mark visible to host via hvcall. vmbus_establish_gpadl() has already done it for storvsc rx/tx ring buffer. The page buffer used by vmbus_sendpacket_ mpb_desc() still need to handle. Use DMA API to map/umap these memory during sending/receiving packet and Hyper-V DMA ops callback will use swiotlb function to allocate bounce buffer and copy data from/to bounce buffer. Signed-off-by: Tianyu Lan --- drivers/scsi/storvsc_drv.c | 63 +++++++++++++++++++++++++++++++++++--- 1 file changed, 58 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index 403753929320..32da419c134e 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -21,6 +21,8 @@ #include #include #include +#include +#include #include #include #include @@ -427,6 +429,8 @@ struct storvsc_cmd_request { u32 payload_sz; struct vstor_packet vstor_packet; + u32 hvpg_count; + struct hv_dma_range *dma_range; }; @@ -1267,6 +1271,7 @@ static void storvsc_on_channel_callback(void *context) struct hv_device *device; struct storvsc_device *stor_device; struct Scsi_Host *shost; + int i; if (channel->primary_channel != NULL) device = channel->primary_channel->device_obj; @@ -1321,6 +1326,17 @@ static void storvsc_on_channel_callback(void *context) request = (struct storvsc_cmd_request *)scsi_cmd_priv(scmnd); } + if (request->dma_range) { + for (i = 0; i < request->hvpg_count; i++) + dma_unmap_page(&device->device, + request->dma_range[i].dma, + request->dma_range[i].mapping_size, + request->vstor_packet.vm_srb.data_in + == READ_TYPE ? + DMA_FROM_DEVICE : DMA_TO_DEVICE); + kfree(request->dma_range); + } + storvsc_on_receive(stor_device, packet, request); continue; } @@ -1817,7 +1833,9 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) unsigned int hvpgoff, hvpfns_to_add; unsigned long offset_in_hvpg = offset_in_hvpage(sgl->offset); unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length); + dma_addr_t dma; u64 hvpfn; + u32 size; if (hvpg_count > MAX_PAGE_BUFFER_COUNT) { @@ -1831,6 +1849,13 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) payload->range.len = length; payload->range.offset = offset_in_hvpg; + cmd_request->dma_range = kcalloc(hvpg_count, + sizeof(*cmd_request->dma_range), + GFP_ATOMIC); + if (!cmd_request->dma_range) { + ret = -ENOMEM; + goto free_payload; + } for (i = 0; sgl != NULL; sgl = sg_next(sgl)) { /* @@ -1854,9 +1879,30 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) * last sgl should be reached at the same time that * the PFN array is filled. */ - while (hvpfns_to_add--) - payload->range.pfn_array[i++] = hvpfn++; + while (hvpfns_to_add--) { + size = min(HV_HYP_PAGE_SIZE - offset_in_hvpg, + (unsigned long)length); + dma = dma_map_page(&dev->device, + pfn_to_page(hvpfn++), + offset_in_hvpg, size, + scmnd->sc_data_direction); + if (dma_mapping_error(&dev->device, dma)) { + ret = -ENOMEM; + goto free_dma_range; + } + + if (offset_in_hvpg) { + payload->range.offset = dma & ~HV_HYP_PAGE_MASK; + offset_in_hvpg = 0; + } + + cmd_request->dma_range[i].dma = dma; + cmd_request->dma_range[i].mapping_size = size; + payload->range.pfn_array[i++] = dma >> HV_HYP_PAGE_SHIFT; + length -= size; + } } + cmd_request->hvpg_count = hvpg_count; } cmd_request->payload = payload; @@ -1867,13 +1913,20 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) put_cpu(); if (ret == -EAGAIN) { - if (payload_sz > sizeof(cmd_request->mpb)) - kfree(payload); /* no more space */ - return SCSI_MLQUEUE_DEVICE_BUSY; + ret = SCSI_MLQUEUE_DEVICE_BUSY; + goto free_dma_range; } return 0; + +free_dma_range: + kfree(cmd_request->dma_range); + +free_payload: + if (payload_sz > sizeof(cmd_request->mpb)) + kfree(payload); + return ret; } static struct scsi_host_template scsi_driver = {