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=-13.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_RED, USER_AGENT_GIT 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 59124C11F68 for ; Wed, 7 Jul 2021 15:35:38 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F404261CDF for ; Wed, 7 Jul 2021 15:35:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F404261CDF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id B6854405DB; Wed, 7 Jul 2021 15:35:37 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cjbL_PlQ75A8; Wed, 7 Jul 2021 15:35:33 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp4.osuosl.org (Postfix) with ESMTPS id 625E440679; Wed, 7 Jul 2021 15:35:33 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 489CEC001A; Wed, 7 Jul 2021 15:35:33 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [IPv6:2605:bc80:3010::138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 52631C001D for ; Wed, 7 Jul 2021 15:35:32 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 418F682EF0 for ; Wed, 7 Jul 2021 15:35:32 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp1.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DCpuEdsMEUdp for ; Wed, 7 Jul 2021 15:35:28 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.8.0 Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) by smtp1.osuosl.org (Postfix) with ESMTPS id BBA0182C3E for ; Wed, 7 Jul 2021 15:35:28 +0000 (UTC) Received: by mail-pf1-x435.google.com with SMTP id a127so2496462pfa.10 for ; Wed, 07 Jul 2021 08:35:28 -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=uSViD25AWGJ6J+QgAwUoKBubGeqJPy/dkYcV0Fzox+c=; b=hxtJfit4Ppjmah6XFuSxBgEgKz4f338nj5l+EvxtZhggrVRUinn9AOrQHtV3DDZKcM Ej5ATK6iOzTsbjVivb/g+9BTMQWADu3EwiqxqN0N034NnjHVc5RFaWjZZi8FrmBMNjDc kTVnavRihE+IY8ODngcmJiywHcuNcHf6IcItZHfq52OJ3mn628/zSiJ1ZgbxaWVOUSz0 Bsu309dV76TSTZYXHHmFastBrfBKRfU/I05CMDCuXl3O9z1Cu5af5rOCjJWqoHIbc7yU FHWKIg6ac9HX4tS5ngN1//k6dwB1ZObR8FLS5h0F4YZI3QaLm7LWUf48h70wjoQGvKbN Okyg== 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=uSViD25AWGJ6J+QgAwUoKBubGeqJPy/dkYcV0Fzox+c=; b=YXnG51t5Fx1tE4C+VIWquLsrnYf2moDcSx2acFwSjyH9ooWB22reJdDjNQHyr7ak/j yxXL7jdr5JihiECDAdr9c3lxhjbQO+m8srrRfK2XcbYKjJOaPFLHXct8FehvIrNUXViA Dzf8dVkJGJjQfwHQzD5KhwftwvRDYpMzbRjf5hAQNyp+VTKZKQCJDcnj/HwIOGolFlGY 1H09lTM69AEsUGfHB3cqw6VNypezb5a1p2nfjzZ/cSKukNTRPXHjhYc9u3ccXtklzuXr SBUtks+i6oibBlY6sKvDwj0E0dH4IzAs6AJOw6CnN6sX72Ncqg2ktxQLPAr5+fGb4Nxm QSvg== X-Gm-Message-State: AOAM533Uo9nTn1a+4qAaiTwS25Tu0edkw46pfUCU8Unx46cpSlB1bZey lDivakeK4vZysGnEYnXiMEk= X-Google-Smtp-Source: ABdhPJxV4DDJMJ1p4O1TlHaSs9jPf4KD9VnkCZ6P4EFyDuvhbptUFuslKTwEut8HFiRhRRaysKUCzA== X-Received: by 2002:a63:4b23:: with SMTP id y35mr26837209pga.179.1625672128224; Wed, 07 Jul 2021 08:35:28 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:0:6b7f:cf3e:bbf2:d229]) by smtp.gmail.com with ESMTPSA id y11sm21096877pfo.160.2021.07.07.08.35.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jul 2021 08:35:27 -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, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, rppt@kernel.org, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, Tianyu.Lan@microsoft.com, thomas.lendacky@amd.com, ardb@kernel.org, nramas@linux.microsoft.com, robh@kernel.org, keescook@chromium.org, rientjes@google.com, pgonda@google.com, martin.b.radev@gmail.com, hannes@cmpxchg.org, saravanand@fb.com, krish.sadhukhan@oracle.com, xen-devel@lists.xenproject.org, tj@kernel.org, michael.h.kelley@microsoft.com Subject: [RFC PATCH V4 09/12] HV/IOMMU: Enable swiotlb bounce buffer for Isolation VM Date: Wed, 7 Jul 2021 11:34:50 -0400 Message-Id: <20210707153456.3976348-10-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210707153456.3976348-1-ltykernel@gmail.com> References: <20210707153456.3976348-1-ltykernel@gmail.com> MIME-Version: 1.0 Cc: linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, brijesh.singh@amd.com, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, anparri@microsoft.com, vkuznets@redhat.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" From: Tianyu Lan Hyper-V Isolation VM requires bounce buffer support to copy data from/to encrypted memory and so enable swiotlb force mode to use swiotlb bounce buffer for DMA transaction. In Isolation VM with AMD SEV, the bounce buffer needs to be accessed via extra address space which is above shared_gpa_boundary (E.G 39 bit address line) reported by Hyper-V CPUID ISOLATION_CONFIG. The access physical address will be original physical address + shared_gpa_boundary. The shared_gpa_boundary in the AMD SEV SNP spec is called virtual top of memory(vTOM). Memory addresses below vTOM are automatically treated as private while memory above vTOM is treated as shared. Swiotlb bounce buffer code calls set_memory_decrypted_map() to mark bounce buffer visible to host and map it in extra address space. Hyper-V initalizes swiotlb bounce buffer and default swiotlb needs to be disabled. pci_swiotlb_detect_override() and pci_swiotlb_detect_4gb() enable the default one. To override the setting, hyperv_swiotlb_detect() needs to run before these detect functions which depends on the pci_xen_swiotlb_ init(). Make pci_xen_swiotlb_init() depends on the hyperv_swiotlb _detect() to keep the order. The map function vmap_pfn() can't work in the early place hyperv_iommu_swiotlb_init() and so initialize swiotlb bounce buffer in the hyperv_iommu_swiotlb_later_init(). Signed-off-by: Tianyu Lan --- arch/x86/xen/pci-swiotlb-xen.c | 3 +- drivers/hv/vmbus_drv.c | 3 ++ drivers/iommu/hyperv-iommu.c | 62 ++++++++++++++++++++++++++++++++++ include/linux/hyperv.h | 1 + 4 files changed, 68 insertions(+), 1 deletion(-) diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c index 54f9aa7e8457..43bd031aa332 100644 --- a/arch/x86/xen/pci-swiotlb-xen.c +++ b/arch/x86/xen/pci-swiotlb-xen.c @@ -4,6 +4,7 @@ #include #include +#include #include #include @@ -91,6 +92,6 @@ int pci_xen_swiotlb_init_late(void) EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late); IOMMU_INIT_FINISH(pci_xen_swiotlb_detect, - NULL, + hyperv_swiotlb_detect, pci_xen_swiotlb_init, NULL); diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 92cb3f7d21d9..5e3bb76d4dee 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -23,6 +23,7 @@ #include #include +#include #include #include #include @@ -2080,6 +2081,7 @@ struct hv_device *vmbus_device_create(const guid_t *type, return child_device_obj; } +static u64 vmbus_dma_mask = DMA_BIT_MASK(64); /* * vmbus_device_register - Register the child device */ @@ -2120,6 +2122,7 @@ int vmbus_device_register(struct hv_device *child_device_obj) } hv_debug_add_dev_dir(child_device_obj); + child_device_obj->device.dma_mask = &vmbus_dma_mask; return 0; err_kset_unregister: diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c index e285a220c913..d7ea8e05b991 100644 --- a/drivers/iommu/hyperv-iommu.c +++ b/drivers/iommu/hyperv-iommu.c @@ -13,14 +13,22 @@ #include #include #include +#include +#include #include #include #include #include +#include +#include #include #include #include +#include +#include +#include +#include #include "irq_remapping.h" @@ -36,6 +44,8 @@ static cpumask_t ioapic_max_cpumask = { CPU_BITS_NONE }; static struct irq_domain *ioapic_ir_domain; +static unsigned long hyperv_io_tlb_start, hyperv_io_tlb_size; + static int hyperv_ir_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force) { @@ -337,4 +347,56 @@ static const struct irq_domain_ops hyperv_root_ir_domain_ops = { .free = hyperv_root_irq_remapping_free, }; +void __init hyperv_iommu_swiotlb_init(void) +{ + unsigned long bytes; + void *vstart; + + /* + * Allocate Hyper-V swiotlb bounce buffer at early place + * to reserve large contiguous memory. + */ + hyperv_io_tlb_size = 200 * 1024 * 1024; + hyperv_io_tlb_start = memblock_alloc_low(PAGE_ALIGN(hyperv_io_tlb_size), + HV_HYP_PAGE_SIZE); + + if (!hyperv_io_tlb_start) { + pr_warn("Fail to allocate Hyper-V swiotlb buffer.\n"); + return; + } +} + +int __init hyperv_swiotlb_detect(void) +{ + if (hypervisor_is_type(X86_HYPER_MS_HYPERV) + && hv_is_isolation_supported()) { + /* + * Enable swiotlb force mode in Isolation VM to + * use swiotlb bounce buffer for dma transaction. + */ + swiotlb_force = SWIOTLB_FORCE; + return 1; + } + + return 0; +} + +void __init hyperv_iommu_swiotlb_later_init(void) +{ + void *hyperv_io_tlb_remap; + int ret; + + /* + * Swiotlb bounce buffer needs to be mapped in extra address + * space. Map function doesn't work in the early place and so + * call swiotlb_late_init_with_tbl() here. + */ + swiotlb_late_init_with_tbl(hyperv_io_tlb_start, + hyperv_io_tlb_size >> IO_TLB_SHIFT); +} + +IOMMU_INIT_FINISH(hyperv_swiotlb_detect, + NULL, hyperv_iommu_swiotlb_init, + hyperv_iommu_swiotlb_later_init); + #endif diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 06eccaba10c5..babbe19f57e2 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1759,6 +1759,7 @@ int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len, int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context, void (*block_invalidate)(void *context, u64 block_mask)); +int __init hyperv_swiotlb_detect(void); struct hyperv_pci_block_ops { int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len, -- 2.25.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu