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It should be ordered after. This seems to result in various kinds of page meta-data corruption related failures: WARNING: CPU: 1 PID: 527 at mm/gup.c:75 try_grab_folio+0x503/0x740 Modules linked in: CPU: 1 PID: 527 Comm: repro Not tainted 6.3.0-rc2-eeac8ede1755+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:try_grab_folio+0x503/0x740 Code: e3 01 48 89 de e8 6d c1 dd ff 48 85 db 0f 84 7c fe ff ff e8 4f bf dd ff 49 8d 47 ff 48 89 45 d0 e9 73 fe ff ff e8 3d bf dd ff <0f> 0b 31 db e9 d0 fc ff ff e8 2f bf dd ff 48 8b 5d c8 31 ff 48 89 RSP: 0018:ffffc90000f37908 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 00000000fffffc02 RCX: ffffffff81504c26 RDX: 0000000000000000 RSI: ffff88800d030000 RDI: 0000000000000002 RBP: ffffc90000f37948 R08: 000000000003ca24 R09: 0000000000000008 R10: 000000000003ca00 R11: 0000000000000023 R12: ffffea000035d540 R13: 0000000000000001 R14: 0000000000000000 R15: ffffea000035d540 FS: 00007fecbf659740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200011c3 CR3: 000000000ef66006 CR4: 0000000000770ee0 PKRU: 55555554 Call Trace: internal_get_user_pages_fast+0xd32/0x2200 pin_user_pages_fast+0x65/0x90 pfn_reader_user_pin+0x376/0x390 pfn_reader_next+0x14a/0x7b0 pfn_reader_first+0x140/0x1b0 iopt_area_fill_domain+0x74/0x210 iopt_table_add_domain+0x30e/0x6e0 iommufd_device_selftest_attach+0x7f/0x140 iommufd_test+0x10ff/0x16f0 iommufd_fops_ioctl+0x206/0x330 __x64_sys_ioctl+0x10e/0x160 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc Cc: Fixes: f394576eb11d ("iommufd: PFN handling for iopt_pages") Reported-by: Pengfei Xu Link: https://lore.kernel.org/r/ZBExkEW/On0ue68q@xpf.sh.intel.com Signed-off-by: Jason Gunthorpe Reviewed-by: Kevin Tian --- drivers/iommu/iommufd/pages.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iommu/iommufd/pages.c b/drivers/iommu/iommufd/pages.c index b11aace836542d..3c47846cc5efe8 100644 --- a/drivers/iommu/iommufd/pages.c +++ b/drivers/iommu/iommufd/pages.c @@ -294,9 +294,9 @@ static void batch_clear_carry(struct pfn_batch *batch, unsigned int keep_pfns) batch->npfns[batch->end - 1] < keep_pfns); batch->total_pfns = keep_pfns; - batch->npfns[0] = keep_pfns; batch->pfns[0] = batch->pfns[batch->end - 1] + (batch->npfns[batch->end - 1] - keep_pfns); + batch->npfns[0] = keep_pfns; batch->end = 0; } From patchwork Fri Mar 31 15:32:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Gunthorpe X-Patchwork-Id: 669320 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 95E2BC76196 for ; Fri, 31 Mar 2023 15:33:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232439AbjCaPdI (ORCPT ); Fri, 31 Mar 2023 11:33:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55546 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232396AbjCaPdH (ORCPT ); Fri, 31 Mar 2023 11:33:07 -0400 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2062.outbound.protection.outlook.com [40.107.237.62]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E4BBF1DFB1 for ; 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Signed-off-by: Jason Gunthorpe Reviewed-by: Kevin Tian --- tools/testing/selftests/iommu/iommufd.c | 34 +++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c index c07252dbf62d72..a2ce8f3c5040f9 100644 --- a/tools/testing/selftests/iommu/iommufd.c +++ b/tools/testing/selftests/iommu/iommufd.c @@ -594,6 +594,40 @@ TEST_F(iommufd_ioas, iova_ranges) EXPECT_EQ(0, ranges[1].last); } +TEST_F(iommufd_ioas, access_domain_destory) +{ + struct iommu_test_cmd access_cmd = { + .size = sizeof(access_cmd), + .op = IOMMU_TEST_OP_ACCESS_PAGES, + .access_pages = { .iova = self->base_iova + PAGE_SIZE, + .length = PAGE_SIZE}, + }; + size_t buf_size = 2 * HUGEPAGE_SIZE; + uint8_t *buf; + + buf = mmap(0, buf_size, PROT_READ | PROT_WRITE, + MAP_SHARED | MAP_ANONYMOUS | MAP_HUGETLB | MAP_POPULATE, -1, + 0); + ASSERT_NE(MAP_FAILED, buf); + test_ioctl_ioas_map_fixed(buf, buf_size, self->base_iova); + + test_cmd_create_access(self->ioas_id, &access_cmd.id, + MOCK_FLAGS_ACCESS_CREATE_NEEDS_PIN_PAGES); + access_cmd.access_pages.uptr = (uintptr_t)buf + PAGE_SIZE; + ASSERT_EQ(0, + ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_PAGES), + &access_cmd)); + + /* Causes a complicated unpin across a huge page boundary */ + if (self->stdev_id) + test_ioctl_destroy(self->stdev_id); + + test_cmd_destroy_access_pages( + access_cmd.id, access_cmd.access_pages.out_access_pages_id); + test_cmd_destroy_access(access_cmd.id); + ASSERT_EQ(0, munmap(buf, buf_size)); +} + TEST_F(iommufd_ioas, access_pin) { struct iommu_test_cmd access_cmd = {