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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Mar 2023 08:33:39.0844 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2fe3a221-149c-4fe2-d379-08db2b794d69 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0000C404.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4286 X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1761147397157090919?= X-GMAIL-MSGID: =?utf-8?q?1761147397157090919?= A driver that doesn't implement ops->dma_unmap shouldn't be allowed to do vfio_pin/unpin_pages(), though it can use vfio_dma_rw() to access an iova range. Deny !ops->dma_unmap cases in vfio_pin/unpin_pages(). Suggested-by: Kevin Tian Reviewed-by: Kevin Tian Reviewed-by: Yi Liu Reviewed-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/vfio/vfio_main.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index 426ebfc0ee1c..546e1fc8d8e1 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -1482,6 +1482,8 @@ int vfio_pin_pages(struct vfio_device *device, dma_addr_t iova, /* group->container cannot change while a vfio device is open */ if (!pages || !npage || WARN_ON(!vfio_assert_device_open(device))) return -EINVAL; + if (!device->ops->dma_unmap) + return -EINVAL; if (vfio_device_has_container(device)) return vfio_device_container_pin_pages(device, iova, npage, prot, pages); @@ -1519,6 +1521,8 @@ void vfio_unpin_pages(struct vfio_device *device, dma_addr_t iova, int npage) { if (WARN_ON(!vfio_assert_device_open(device))) return; + if (WARN_ON(!device->ops->dma_unmap)) + return; if (vfio_device_has_container(device)) { vfio_device_container_unpin_pages(device, iova, npage); From patchwork Thu Mar 23 08:33:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 73898 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:604a:0:0:0:0:0 with SMTP id j10csp2790563wrt; Thu, 23 Mar 2023 01:41:51 -0700 (PDT) X-Google-Smtp-Source: AK7set9wz1ccyCPafLIN1HMNqKoQCDBAieBB2AuEPViMQpa9E3P9JkJ2/E+zEOUavoD2NLxVMkRC X-Received: by 2002:a17:902:e808:b0:19f:3228:ac34 with SMTP id u8-20020a170902e80800b0019f3228ac34mr6916967plg.61.1679560911164; Thu, 23 Mar 2023 01:41:51 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1679560911; cv=pass; d=google.com; s=arc-20160816; b=Ehfa7C5TGLxBWpC9UWzivuClLQKTFRelXA6OGSKm6ZCJugo8DQZmQ6zgm82qIdYOpj WkwAKggLyZkeAQ51gi1an4iRfUMEzHl1lkaSr9XzTLhtJ/uTnbKk6e13ZvVm45VmlaK/ 3Hglqi4yY393sehujxlCdu1Si2s0TTQ/Dp7xUcdeUl8faP564KDmT7dlUM4jv0SC/X8D UCDT2djqF/P3a92Cu9TgiDVoz6ZMjOvMNECNQFOnLwldzMoJ8kGDMMCEGVm8eekjDAbM ussgr85h5+T6gLcKXBDzTmTZZkKr8hf0ntSnAObwrVL7ZFhJ75TeEeYOfjMsWqTVs7ey mRXw== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=jPC1QRJtNYeYfwMILSbEoejTgiHZH9D/NLYMZO1NuWo=; b=GYSgtx4oqAqSalgLoHSwKmqo8OO282/QRAzAAB+X7dWsQHuRg5EmlEGTgCqUYN8IaC RKjlyIMNNfQ98JF//vuKAOijc4xiVD9rS5pySY6/x7Al60MYoTpw92SVmU6/lt4AjPeq msgEm+oNQPwYz22sqSFE6gHypHVC57/ZmoOFfzHIzoTjEwWF7sErt6ESn+2lGdnRc6zF p4ASruY2YUJGhJkx+BJctUC+7dxfF/SDQ2lpkhva93RUllucFQil5EfI1pTvU39HWmgS kG2VnoETSpt7VFl3K3HYy97TcM5kDDDci50WXbifigxtWGO0+PeXbIrd1CTzrf8ykOKE m3Jw== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@Nvidia.com header.s=selector2 header.b=gBx8oR1n; arc=pass (i=1 spf=pass spfdomain=nvidia.com dmarc=pass fromdomain=nvidia.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=nvidia.com Received: from out1.vger.email (out1.vger.email. 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Add iommufd_access_replace() function for VFIO emulated pathway to use. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/device.c | 60 ++++++++++++++++++++----- include/linux/iommufd.h | 1 + tools/testing/selftests/iommu/iommfd*.c | 0 3 files changed, 50 insertions(+), 11 deletions(-) create mode 100644 tools/testing/selftests/iommu/iommfd*.c diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 012e85fc6d77..3b39b76fbc3b 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -746,39 +746,77 @@ void iommufd_access_detach(struct iommufd_access *access) } EXPORT_SYMBOL_NS_GPL(iommufd_access_detach, IOMMUFD); -int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id) +static struct iommufd_ioas * +iommufd_access_change_pt(struct iommufd_access *access, u32 ioas_id) { struct iommufd_ioas *new_ioas; struct iommufd_object *obj; int rc = 0; + lockdep_assert_held(&access->ioas_lock); + + obj = iommufd_get_object(access->ictx, ioas_id, IOMMUFD_OBJ_IOAS); + if (IS_ERR(obj)) + return (struct iommufd_ioas *)obj; + new_ioas = container_of(obj, struct iommufd_ioas, obj); + + rc = iopt_add_access(&new_ioas->iopt, access); + if (rc) { + iommufd_put_object(obj); + return ERR_PTR(rc); + } + iommufd_ref_to_users(obj); + return new_ioas; +} + +int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id) +{ + struct iommufd_ioas *new_ioas; + mutex_lock(&access->ioas_lock); if (access->ioas != NULL && access->ioas->obj.id != ioas_id) { mutex_unlock(&access->ioas_lock); return -EINVAL; } - obj = iommufd_get_object(access->ictx, ioas_id, IOMMUFD_OBJ_IOAS); - if (IS_ERR(obj)) { + new_ioas = iommufd_access_change_pt(access, ioas_id); + if (IS_ERR(new_ioas)) { mutex_unlock(&access->ioas_lock); - return PTR_ERR(obj); + return PTR_ERR(new_ioas); } - new_ioas = container_of(obj, struct iommufd_ioas, obj); + access->ioas = new_ioas; + access->ioas_unpin = new_ioas; + mutex_unlock(&access->ioas_lock); + return 0; +} +EXPORT_SYMBOL_NS_GPL(iommufd_access_attach, IOMMUFD); - rc = iopt_add_access(&new_ioas->iopt, access); - if (rc) { +int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id) +{ + struct iommufd_ioas *new_ioas; + + mutex_lock(&access->ioas_lock); + if (!access->ioas) { mutex_unlock(&access->ioas_lock); - iommufd_put_object(obj); - return rc; + return -ENOENT; + } + if (access->ioas->obj.id == ioas_id) { + mutex_unlock(&access->ioas_lock); + return 0; } - iommufd_ref_to_users(obj); + new_ioas = iommufd_access_change_pt(access, ioas_id); + if (IS_ERR(new_ioas)) { + mutex_unlock(&access->ioas_lock); + return PTR_ERR(new_ioas); + } + __iommufd_access_detach(access); access->ioas = new_ioas; access->ioas_unpin = new_ioas; mutex_unlock(&access->ioas_lock); return 0; } -EXPORT_SYMBOL_NS_GPL(iommufd_access_attach, IOMMUFD); +EXPORT_SYMBOL_NS_GPL(iommufd_access_replace, IOMMUFD); /** * iommufd_access_notify_unmap - Notify users of an iopt to stop using it diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 7c79f9b33246..cd7ae5a625fc 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -46,6 +46,7 @@ iommufd_access_create(struct iommufd_ctx *ictx, const struct iommufd_access_ops *ops, void *data, u32 *id); void iommufd_access_destroy(struct iommufd_access *access); int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id); +int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id); void iommufd_access_detach(struct iommufd_access *access); void iommufd_ctx_get(struct iommufd_ctx *ictx); diff --git a/tools/testing/selftests/iommu/iommfd*.c b/tools/testing/selftests/iommu/iommfd*.c new file mode 100644 index 000000000000..e69de29bb2d1 From patchwork Thu Mar 23 08:33:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 73901 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:604a:0:0:0:0:0 with SMTP id j10csp2792097wrt; Thu, 23 Mar 2023 01:46:46 -0700 (PDT) X-Google-Smtp-Source: AK7set8y4dFxSk2ZnZKdRoXTdVg1obMCESxtXovUy8D0RcHHTqpL+MDuBEEtRx3/1vGqFlIVHzQU X-Received: by 2002:a17:906:3612:b0:933:2f77:ca78 with SMTP id q18-20020a170906361200b009332f77ca78mr9862159ejb.28.1679561206260; 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Then add a replace coverage as a part of user_copy test case, which basically repeats the copy test after replacing the old ioas with a new one. Reviewed-by: Kevin Tian Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/iommufd_test.h | 4 +++ drivers/iommu/iommufd/selftest.c | 19 ++++++++++++ tools/testing/selftests/iommu/iommufd.c | 29 +++++++++++++++++-- tools/testing/selftests/iommu/iommufd_utils.h | 19 ++++++++++++ 4 files changed, 69 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h index dd9168a20ddf..258de2253b61 100644 --- a/drivers/iommu/iommufd/iommufd_test.h +++ b/drivers/iommu/iommufd/iommufd_test.h @@ -18,6 +18,7 @@ enum { IOMMU_TEST_OP_ACCESS_RW, IOMMU_TEST_OP_SET_TEMP_MEMORY_LIMIT, IOMMU_TEST_OP_MOCK_DOMAIN_REPLACE, + IOMMU_TEST_OP_ACCESS_REPLACE_IOAS, }; enum { @@ -91,6 +92,9 @@ struct iommu_test_cmd { struct { __u32 limit; } memory_limit; + struct { + __u32 ioas_id; + } access_replace_ioas; }; __u32 last; }; diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c index ff4fc88640a0..9f6b2d71bc87 100644 --- a/drivers/iommu/iommufd/selftest.c +++ b/drivers/iommu/iommufd/selftest.c @@ -785,6 +785,22 @@ static int iommufd_test_create_access(struct iommufd_ucmd *ucmd, return rc; } +static int iommufd_test_access_replace_ioas(struct iommufd_ucmd *ucmd, + unsigned int access_id, + unsigned int ioas_id) +{ + struct selftest_access *staccess; + int rc; + + staccess = iommufd_access_get(access_id); + if (IS_ERR(staccess)) + return PTR_ERR(staccess); + + rc = iommufd_access_replace(staccess->access, ioas_id); + fput(staccess->file); + return rc; +} + /* Check that the pages in a page array match the pages in the user VA */ static int iommufd_test_check_pages(void __user *uptr, struct page **pages, size_t npages) @@ -1000,6 +1016,9 @@ int iommufd_test(struct iommufd_ucmd *ucmd) case IOMMU_TEST_OP_CREATE_ACCESS: return iommufd_test_create_access(ucmd, cmd->id, cmd->create_access.flags); + case IOMMU_TEST_OP_ACCESS_REPLACE_IOAS: + return iommufd_test_access_replace_ioas( + ucmd, cmd->id, cmd->access_replace_ioas.ioas_id); case IOMMU_TEST_OP_ACCESS_PAGES: return iommufd_test_access_pages( ucmd, cmd->id, cmd->access_pages.iova, diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c index c07252dbf62d..3c8cb9d6c22b 100644 --- a/tools/testing/selftests/iommu/iommufd.c +++ b/tools/testing/selftests/iommu/iommufd.c @@ -1252,7 +1252,13 @@ TEST_F(iommufd_mock_domain, user_copy) .dst_iova = MOCK_APERTURE_START, .length = BUFFER_SIZE, }; - unsigned int ioas_id; + struct iommu_ioas_unmap unmap_cmd = { + .size = sizeof(unmap_cmd), + .ioas_id = self->ioas_id, + .iova = MOCK_APERTURE_START, + .length = BUFFER_SIZE, + }; + unsigned int new_ioas_id, ioas_id; /* Pin the pages in an IOAS with no domains then copy to an IOAS with domains */ test_ioctl_ioas_alloc(&ioas_id); @@ -1270,11 +1276,30 @@ TEST_F(iommufd_mock_domain, user_copy) ASSERT_EQ(0, ioctl(self->fd, IOMMU_IOAS_COPY, ©_cmd)); check_mock_iova(buffer, MOCK_APERTURE_START, BUFFER_SIZE); + /* Now replace the ioas with a new one */ + test_ioctl_ioas_alloc(&new_ioas_id); + test_ioctl_ioas_map_id(new_ioas_id, buffer, BUFFER_SIZE, + ©_cmd.src_iova); + test_cmd_access_replace_ioas(access_cmd.id, new_ioas_id); + + /* Destroy the old ioas and cleanup copied mapping */ + ASSERT_EQ(0, ioctl(self->fd, IOMMU_IOAS_UNMAP, &unmap_cmd)); + test_ioctl_destroy(ioas_id); + + /* Then run the same test again with the new ioas */ + access_cmd.access_pages.iova = copy_cmd.src_iova; + ASSERT_EQ(0, + ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_PAGES), + &access_cmd)); + copy_cmd.src_ioas_id = new_ioas_id; + ASSERT_EQ(0, ioctl(self->fd, IOMMU_IOAS_COPY, ©_cmd)); + check_mock_iova(buffer, MOCK_APERTURE_START, BUFFER_SIZE); + test_cmd_destroy_access_pages( access_cmd.id, access_cmd.access_pages.out_access_pages_id); test_cmd_destroy_access(access_cmd.id); - test_ioctl_destroy(ioas_id); + test_ioctl_destroy(new_ioas_id); } TEST_F(iommufd_mock_domain, replace) diff --git a/tools/testing/selftests/iommu/iommufd_utils.h b/tools/testing/selftests/iommu/iommufd_utils.h index 9b6dcb921750..c31e75607355 100644 --- a/tools/testing/selftests/iommu/iommufd_utils.h +++ b/tools/testing/selftests/iommu/iommufd_utils.h @@ -117,6 +117,25 @@ static int _test_cmd_hwpt_alloc(int fd, __u32 device_id, __u32 pt_id, #define test_cmd_hwpt_alloc(device_id, pt_id, hwpt_id) \ ASSERT_EQ(0, _test_cmd_hwpt_alloc(self->fd, device_id, pt_id, hwpt_id)) +static int _test_cmd_access_replace_ioas(int fd, __u32 access_id, + unsigned int ioas_id) +{ + struct iommu_test_cmd cmd = { + .size = sizeof(cmd), + .op = IOMMU_TEST_OP_ACCESS_REPLACE_IOAS, + .id = access_id, + .access_replace_ioas = { .ioas_id = ioas_id }, + }; + int ret; + + ret = ioctl(fd, IOMMU_TEST_CMD, &cmd); + if (ret) + return ret; + return 0; +} +#define test_cmd_access_replace_ioas(access_id, ioas_id) \ + ASSERT_EQ(0, _test_cmd_access_replace_ioas(self->fd, access_id, ioas_id)) + static int _test_cmd_create_access(int fd, unsigned int ioas_id, __u32 *access_id, unsigned int flags) { From patchwork Thu Mar 23 08:33:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 73899 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:604a:0:0:0:0:0 with SMTP id j10csp2790964wrt; Thu, 23 Mar 2023 01:43:11 -0700 (PDT) X-Google-Smtp-Source: AK7set8xWvTPgAt8yp9E9i6MPoj+8PqMha46fqdsSyjhFwN79kMtkNM/6hLRm+EW6t65Ml8tUt7C X-Received: by 2002:a17:902:f90b:b0:19c:a9b8:4349 with SMTP id kw11-20020a170902f90b00b0019ca9b84349mr4725240plb.32.1679560991539; Thu, 23 Mar 2023 01:43:11 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1679560991; cv=pass; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Mar 2023 08:33:41.6077 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4fa4bf11-7ea6-4dcb-799f-08db2b794ee8 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF000108E9.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7776 X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1761147346322951058?= X-GMAIL-MSGID: =?utf-8?q?1761147346322951058?= Now both the physical path and the emulated path should support an IO page table replacement. Call iommufd_device_replace/iommufd_access_replace(), when vdev->iommufd_attached is true. Also update the VFIO_DEVICE_ATTACH_IOMMUFD_PT kdoc in the uAPI header. Signed-off-by: Nicolin Chen Reviewed-by: Kevin Tian --- drivers/vfio/iommufd.c | 11 ++++++----- include/uapi/linux/vfio.h | 6 ++++++ 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c index f3fa03495a41..861e10a6b198 100644 --- a/drivers/vfio/iommufd.c +++ b/drivers/vfio/iommufd.c @@ -113,9 +113,9 @@ int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id) return -EINVAL; if (vdev->iommufd_attached) - return -EBUSY; - - rc = iommufd_device_attach(vdev->iommufd_device, pt_id); + rc = iommufd_device_replace(vdev->iommufd_device, pt_id); + else + rc = iommufd_device_attach(vdev->iommufd_device, pt_id); if (rc) return rc; vdev->iommufd_attached = true; @@ -192,8 +192,9 @@ int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id) if (WARN_ON(!vdev->iommufd_access)) return -ENOENT; if (vdev->iommufd_attached) - return -EBUSY; - rc = iommufd_access_attach(vdev->iommufd_access, *pt_id); + rc = iommufd_access_replace(vdev->iommufd_access, *pt_id); + else + rc = iommufd_access_attach(vdev->iommufd_access, *pt_id); if (rc) return rc; vdev->iommufd_attached = true; diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index 53c72e26ecd3..3f2548a5e847 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -243,6 +243,12 @@ struct vfio_device_bind_iommufd { * * Undo by VFIO_DEVICE_DETACH_IOMMUFD_PT or device fd close. * + * If a vfio device is currently attached to a valid hw_pagetable, without doing + * a VFIO_DEVICE_DETACH_IOMMUFD_PT, a second VFIO_DEVICE_ATTACH_IOMMUFD_PT ioctl + * passing in another hw_pagetable (hwpt) id is allowed. This action, also known + * as a hw_pagetable replacement, will replace the device's currently attached + * hw_pagetable with a new hw_pagetable corresponding to the given pt_id. + * * @argsz: user filled size of this data. * @flags: must be 0. * @pt_id: Input the target id which can represent an ioas or a hwpt