From patchwork Wed Nov 4 15:18:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 11881015 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=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE 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 45EB5C4741F for ; Wed, 4 Nov 2020 15:21:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DF4902076D for ; Wed, 4 Nov 2020 15:21:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="a7bEg/lm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730729AbgKDPVa (ORCPT ); Wed, 4 Nov 2020 10:21:30 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:26718 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730688AbgKDPV2 (ORCPT ); Wed, 4 Nov 2020 10:21:28 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1604503286; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=uSFT8eKoJ5cQvPnVenZnrvLMn9Hkughdr5Pbtm2yll8=; b=a7bEg/lmthLKixbYltYzsWAkcqB2HUoISGaEZjqE0EGwBj+e2rUMMqo11jnPrzxfE7mJ7g uDdssatDgB9px2T9bjaOdMKhKozl57hSyAqFDMtt6IWlsttM2yPo0iIk7bq5N36CQytb28 DZhgf7ldtUCcX8vP0fJ7XtUkrcbIKcc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-105-bkBbB6DNPnSSnH2ZIfDPwA-1; Wed, 04 Nov 2020 10:21:22 -0500 X-MC-Unique: bkBbB6DNPnSSnH2ZIfDPwA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 601CC101F012; Wed, 4 Nov 2020 15:21:20 +0000 (UTC) Received: from localhost (ovpn-115-145.ams2.redhat.com [10.36.115.145]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2DE865C3E1; Wed, 4 Nov 2020 15:21:14 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org, Peter Maydell Cc: kvm@vger.kernel.org, "Dr. David Alan Gilbert" , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Eduardo Habkost , Markus Armbruster , Eric Blake , Fam Zheng , Stefan Hajnoczi , Keith Busch , Max Reitz , qemu-block@nongnu.org, Kevin Wolf , Coiby Xu , Paolo Bonzini , Klaus Jensen , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Eric Auger Subject: [PULL 25/33] block/nvme: Fix use of write-only doorbells page on Aarch64 arch Date: Wed, 4 Nov 2020 15:18:20 +0000 Message-Id: <20201104151828.405824-26-stefanha@redhat.com> In-Reply-To: <20201104151828.405824-1-stefanha@redhat.com> References: <20201104151828.405824-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Philippe Mathieu-Daudé qemu_vfio_pci_map_bar() calls mmap(), and mmap(2) states: 'offset' must be a multiple of the page size as returned by sysconf(_SC_PAGE_SIZE). In commit f68453237b9 we started to use an offset of 4K which broke this contract on Aarch64 arch. Fix by mapping at offset 0, and and accessing doorbells at offset=4K. Fixes: f68453237b9 ("block/nvme: Map doorbells pages write-only") Reported-by: Eric Auger Reviewed-by: Eric Auger Reviewed-by: Stefan Hajnoczi Tested-by: Eric Auger Signed-off-by: Philippe Mathieu-Daudé Message-id: 20201029093306.1063879-24-philmd@redhat.com Signed-off-by: Stefan Hajnoczi Tested-by: Eric Auger --- block/nvme.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/block/nvme.c b/block/nvme.c index f1e2fd34cd..c8ef69cbb2 100644 --- a/block/nvme.c +++ b/block/nvme.c @@ -94,6 +94,7 @@ typedef struct { struct BDRVNVMeState { AioContext *aio_context; QEMUVFIOState *vfio; + void *bar0_wo_map; /* Memory mapped registers */ volatile struct { uint32_t sq_tail; @@ -777,8 +778,10 @@ static int nvme_init(BlockDriverState *bs, const char *device, int namespace, } } - s->doorbells = qemu_vfio_pci_map_bar(s->vfio, 0, sizeof(NvmeBar), - NVME_DOORBELL_SIZE, PROT_WRITE, errp); + s->bar0_wo_map = qemu_vfio_pci_map_bar(s->vfio, 0, 0, + sizeof(NvmeBar) + NVME_DOORBELL_SIZE, + PROT_WRITE, errp); + s->doorbells = (void *)((uintptr_t)s->bar0_wo_map + sizeof(NvmeBar)); if (!s->doorbells) { ret = -EINVAL; goto out; @@ -910,8 +913,8 @@ static void nvme_close(BlockDriverState *bs) &s->irq_notifier[MSIX_SHARED_IRQ_IDX], false, NULL, NULL); event_notifier_cleanup(&s->irq_notifier[MSIX_SHARED_IRQ_IDX]); - qemu_vfio_pci_unmap_bar(s->vfio, 0, (void *)s->doorbells, - sizeof(NvmeBar), NVME_DOORBELL_SIZE); + qemu_vfio_pci_unmap_bar(s->vfio, 0, s->bar0_wo_map, + 0, sizeof(NvmeBar) + NVME_DOORBELL_SIZE); qemu_vfio_close(s->vfio); g_free(s->device);