From patchwork Wed May 29 16:23:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Levon X-Patchwork-Id: 13679242 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 624F3C25B7C for ; Wed, 29 May 2024 16:30:27 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sCM7T-0001o1-PF; Wed, 29 May 2024 12:25:43 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sCM75-0001IB-4I for qemu-devel@nongnu.org; Wed, 29 May 2024 12:25:23 -0400 Received: from ssh.movementarian.org ([139.162.205.133] helo=movementarian.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sCM72-0006N6-Nt for qemu-devel@nongnu.org; Wed, 29 May 2024 12:25:18 -0400 Received: from movement by movementarian.org with local (Exim 4.95) (envelope-from ) id 1sCM6r-006CR0-9r; Wed, 29 May 2024 17:25:05 +0100 From: John Levon To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, jag.raman@oracle.com, thanos.makatos@nutanix.com, John Johnson , Elena Ufimtseva , John Levon Subject: [PATCH 22/26] vfio-user: no-mmap DMA support Date: Wed, 29 May 2024 17:23:15 +0100 Message-Id: <20240529162319.1476680-23-levon@movementarian.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240529162319.1476680-1-levon@movementarian.org> References: <20240529162319.1476680-1-levon@movementarian.org> MIME-Version: 1.0 Received-SPF: pass client-ip=139.162.205.133; envelope-from=movement@movementarian.org; helo=movementarian.org X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Jagannathan Raman Force remote process to use DMA r/w messages instead of directly mapping guest memory. Originally-by: John Johnson Signed-off-by: Elena Ufimtseva Signed-off-by: Jagannathan Raman Signed-off-by: John Levon --- hw/vfio/user-container.c | 2 +- hw/vfio/user-pci.c | 5 +++++ hw/vfio/user.h | 1 + 3 files changed, 7 insertions(+), 1 deletion(-) diff --git a/hw/vfio/user-container.c b/hw/vfio/user-container.c index 213861fb5d..1f6710e0b7 100644 --- a/hw/vfio/user-container.c +++ b/hw/vfio/user-container.c @@ -110,7 +110,7 @@ static int vfio_user_dma_map(const VFIOContainerBase *bcontainer, hwaddr iova, * vaddr enters as a QEMU process address; make it either a file offset * for mapped areas or leave as 0. */ - if (fd != -1) { + if (fd != -1 && !(container->proxy->flags & VFIO_PROXY_NO_MMAP)) { msgp->offset = qemu_ram_block_host_offset(mrp->ram_block, vaddr); } diff --git a/hw/vfio/user-pci.c b/hw/vfio/user-pci.c index 9514f6e2fa..19fbcf77ab 100644 --- a/hw/vfio/user-pci.c +++ b/hw/vfio/user-pci.c @@ -40,6 +40,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(VFIOUserPCIDevice, VFIO_USER_PCI) struct VFIOUserPCIDevice { VFIOPCIDevice device; char *sock_name; + bool no_direct_dma; /* disable shared mem for DMA */ bool send_queued; /* all sends are queued */ bool no_post; /* all regions write are sync */ }; @@ -158,6 +159,9 @@ static void vfio_user_pci_realize(PCIDevice *pdev, Error **errp) vbasedev->proxy = proxy; vfio_user_set_handler(vbasedev, vfio_user_pci_process_req, vdev); + if (udev->no_direct_dma) { + proxy->flags |= VFIO_PROXY_NO_MMAP; + } if (udev->send_queued) { proxy->flags |= VFIO_PROXY_FORCE_QUEUED; } @@ -277,6 +281,7 @@ static void vfio_user_instance_finalize(Object *obj) static Property vfio_user_pci_dev_properties[] = { DEFINE_PROP_STRING("socket", VFIOUserPCIDevice, sock_name), + DEFINE_PROP_BOOL("no-direct-dma", VFIOUserPCIDevice, no_direct_dma, false), DEFINE_PROP_BOOL("x-send-queued", VFIOUserPCIDevice, send_queued, false), DEFINE_PROP_BOOL("x-no-posted-writes", VFIOUserPCIDevice, no_post, false), DEFINE_PROP_END_OF_LIST(), diff --git a/hw/vfio/user.h b/hw/vfio/user.h index 31d2c5abd9..fe24a881f2 100644 --- a/hw/vfio/user.h +++ b/hw/vfio/user.h @@ -94,6 +94,7 @@ typedef struct VFIOUserProxy { /* VFIOProxy flags */ #define VFIO_PROXY_CLIENT 0x1 +#define VFIO_PROXY_NO_MMAP 0x2 #define VFIO_PROXY_FORCE_QUEUED 0x4 #define VFIO_PROXY_NO_POST 0x8