From patchwork Fri May 8 19:20:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ralph Campbell X-Patchwork-Id: 11537489 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EA7221668 for ; Fri, 8 May 2020 19:20:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D331524967 for ; Fri, 8 May 2020 19:20:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="A7BnT3lq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727841AbgEHTUc (ORCPT ); Fri, 8 May 2020 15:20:32 -0400 Received: from hqnvemgate26.nvidia.com ([216.228.121.65]:17065 "EHLO hqnvemgate26.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727826AbgEHTUa (ORCPT ); Fri, 8 May 2020 15:20:30 -0400 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate26.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Fri, 08 May 2020 12:20:17 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Fri, 08 May 2020 12:20:29 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Fri, 08 May 2020 12:20:29 -0700 Received: from HQMAIL109.nvidia.com (172.20.187.15) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 8 May 2020 19:20:28 +0000 Received: from rnnvemgw01.nvidia.com (10.128.109.123) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Fri, 8 May 2020 19:20:28 +0000 Received: from rcampbell-dev.nvidia.com (Not Verified[10.110.48.66]) by rnnvemgw01.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Fri, 08 May 2020 12:20:28 -0700 From: Ralph Campbell To: , , , , CC: Jerome Glisse , John Hubbard , Christoph Hellwig , Jason Gunthorpe , "Ben Skeggs" , Andrew Morton , "Shuah Khan" , Ralph Campbell Subject: [PATCH 6/6] hmm: add tests for HMM_PFN_COMPOUND flag Date: Fri, 8 May 2020 12:20:09 -0700 Message-ID: <20200508192009.15302-7-rcampbell@nvidia.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200508192009.15302-1-rcampbell@nvidia.com> References: <20200508192009.15302-1-rcampbell@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1588965617; bh=HRUw/bu4Btut299L3QeBB9VBXDFxLZRSbK0wDcgFRCs=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=A7BnT3lqP7rWfLeriVSpAopb4ejYrNpag43q351DqKO+Q4m/OxcW6ff67L6eA836W N4otqDMgc2tYQVWPynhfwemwdWoZUEcr4FW0j9wGESDxxRReyvWBoREQoyf36pC6yj gzG3XG69GMxnnRBVJ9d2svEI5tvSEmAW2h/xklNL9Qq5ZTZyN892fskfOPnG9wFt6c Zsyu5LPu5E0X8GQ6lRYoESiEfcd192n3+WWLQxgOpaDaVRABXTRFQxBnMQFr0LN1cG +wNUxgPCCUcub2Jhz1jp26Kg01iQl0YJevMMJzFOuof/ZMeZWFNpuaXKYfasQgWPex Jc19NW+mP3HRg== Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add some sanity tests for hmm_range_fault() returning the HMM_PFN_COMPOUND flag. Signed-off-by: Ralph Campbell --- lib/test_hmm.c | 2 + lib/test_hmm_uapi.h | 2 + tools/testing/selftests/vm/hmm-tests.c | 76 ++++++++++++++++++++++++++ 3 files changed, 80 insertions(+) diff --git a/lib/test_hmm.c b/lib/test_hmm.c index 00bca6116f93..8448921e6d33 100644 --- a/lib/test_hmm.c +++ b/lib/test_hmm.c @@ -757,6 +757,8 @@ static void dmirror_mkentry(struct dmirror *dmirror, struct hmm_range *range, *perm |= HMM_DMIRROR_PROT_WRITE; else *perm |= HMM_DMIRROR_PROT_READ; + if (entry & HMM_PFN_COMPOUND) + *perm |= HMM_DMIRROR_PROT_COMPOUND; } static bool dmirror_snapshot_invalidate(struct mmu_interval_notifier *mni, diff --git a/lib/test_hmm_uapi.h b/lib/test_hmm_uapi.h index 67b3b2e6ff5d..21cf4da6f020 100644 --- a/lib/test_hmm_uapi.h +++ b/lib/test_hmm_uapi.h @@ -40,6 +40,7 @@ struct hmm_dmirror_cmd { * HMM_DMIRROR_PROT_NONE: unpopulated PTE or PTE with no access * HMM_DMIRROR_PROT_READ: read-only PTE * HMM_DMIRROR_PROT_WRITE: read/write PTE + * HMM_DMIRROR_PROT_COMPOUND: compound page is fully mapped by same permissions * HMM_DMIRROR_PROT_ZERO: special read-only zero page * HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL: Migrated device private page on the * device the ioctl() is made @@ -51,6 +52,7 @@ enum { HMM_DMIRROR_PROT_NONE = 0x00, HMM_DMIRROR_PROT_READ = 0x01, HMM_DMIRROR_PROT_WRITE = 0x02, + HMM_DMIRROR_PROT_COMPOUND = 0x04, HMM_DMIRROR_PROT_ZERO = 0x10, HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL = 0x20, HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE = 0x30, diff --git a/tools/testing/selftests/vm/hmm-tests.c b/tools/testing/selftests/vm/hmm-tests.c index 79db22604019..e9576d9802c7 100644 --- a/tools/testing/selftests/vm/hmm-tests.c +++ b/tools/testing/selftests/vm/hmm-tests.c @@ -1291,6 +1291,82 @@ TEST_F(hmm2, snapshot) hmm_buffer_free(buffer); } +/* + * Test the hmm_range_fault() HMM_PFN_COMPOUND flag for large pages that + * should be mapped by a large page table entry. + */ +TEST_F(hmm, compound) +{ + struct hmm_buffer *buffer; + unsigned long npages; + unsigned long size; + int *ptr; + unsigned char *m; + int ret; + long pagesizes[4]; + int n, idx; + unsigned long i; + + /* Skip test if we can't allocate a hugetlbfs page. */ + + n = gethugepagesizes(pagesizes, 4); + if (n <= 0) + return; + for (idx = 0; --n > 0; ) { + if (pagesizes[n] < pagesizes[idx]) + idx = n; + } + size = ALIGN(TWOMEG, pagesizes[idx]); + npages = size >> self->page_shift; + + buffer = malloc(sizeof(*buffer)); + ASSERT_NE(buffer, NULL); + + buffer->ptr = get_hugepage_region(size, GHR_STRICT); + if (buffer->ptr == NULL) { + free(buffer); + return; + } + + buffer->size = size; + buffer->mirror = malloc(npages); + ASSERT_NE(buffer->mirror, NULL); + + /* Initialize the pages the device will snapshot in buffer->ptr. */ + for (i = 0, ptr = buffer->ptr; i < size / sizeof(*ptr); ++i) + ptr[i] = i; + + /* Simulate a device snapshotting CPU pagetables. */ + ret = hmm_dmirror_cmd(self->fd, HMM_DMIRROR_SNAPSHOT, buffer, npages); + ASSERT_EQ(ret, 0); + ASSERT_EQ(buffer->cpages, npages); + + /* Check what the device saw. */ + m = buffer->mirror; + for (i = 0; i < npages; ++i) + ASSERT_EQ(m[i], HMM_DMIRROR_PROT_WRITE | + HMM_DMIRROR_PROT_COMPOUND); + + /* Make the region read-only. */ + ret = mprotect(buffer->ptr, size, PROT_READ); + ASSERT_EQ(ret, 0); + + /* Simulate a device snapshotting CPU pagetables. */ + ret = hmm_dmirror_cmd(self->fd, HMM_DMIRROR_SNAPSHOT, buffer, npages); + ASSERT_EQ(ret, 0); + ASSERT_EQ(buffer->cpages, npages); + + /* Check what the device saw. */ + m = buffer->mirror; + for (i = 0; i < npages; ++i) + ASSERT_EQ(m[i], HMM_DMIRROR_PROT_READ | + HMM_DMIRROR_PROT_COMPOUND); + + free_hugepage_region(buffer->ptr); + buffer->ptr = NULL; + hmm_buffer_free(buffer); +} + /* * Test two devices reading the same memory (double mapped). */