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Mon, 25 Jul 2022 11:36:36 -0700 From: Ralph Campbell To: CC: Felix Kuehling , Philip Yang , Alistair Popple , Jason Gunthorpe , Andrew Morton , Ralph Campbell Subject: [PATCH v2 2/2] mm/hmm: add a test for cross device private faults Date: Mon, 25 Jul 2022 11:36:15 -0700 Message-ID: <20220725183615.4118795-3-rcampbell@nvidia.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220725183615.4118795-1-rcampbell@nvidia.com> References: <20220725183615.4118795-1-rcampbell@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 262cc915-45c2-4678-8c10-08da6e6c9e63 X-MS-TrafficTypeDiagnostic: BY5PR12MB3876:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.236;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230016)(4636009)(376002)(136003)(396003)(346002)(39860400002)(46966006)(36840700001)(40470700004)(478600001)(40480700001)(8936002)(36860700001)(26005)(5660300002)(40460700003)(336012)(47076005)(6666004)(426003)(86362001)(1076003)(186003)(83380400001)(2616005)(2906002)(7696005)(82310400005)(41300700001)(82740400003)(81166007)(356005)(54906003)(316002)(107886003)(36756003)(70206006)(70586007)(4326008)(8676002)(6916009)(36900700001);DIR:OUT;SFP:1101; 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dkim=pass header.d=Nvidia.com header.s=selector2 header.b=IWyDMESi; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector9901:i=1"); spf=none (imf03.hostedemail.com: domain of rcampbell@nvidia.com has no SPF policy when checking 40.107.93.50) smtp.mailfrom=rcampbell@nvidia.com X-HE-Tag: 1658774205-584916 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add a simple test case for when hmm_range_fault() is called with the HMM_PFN_REQ_FAULT flag and a device private PTE is found for a device other than the hmm_range::dev_private_owner. This should cause the page to be faulted back to system memory from the other device and the PFN returned in the output array. Signed-off-by: Ralph Campbell Reviewed-by: Alistair Popple --- tools/testing/selftests/vm/hmm-tests.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/vm/hmm-tests.c b/tools/testing/selftests/vm/hmm-tests.c index 203323967b50..a5ce7cc2e7aa 100644 --- a/tools/testing/selftests/vm/hmm-tests.c +++ b/tools/testing/selftests/vm/hmm-tests.c @@ -1520,9 +1520,19 @@ TEST_F(hmm2, double_map) for (i = 0, ptr = buffer->mirror; i < size / sizeof(*ptr); ++i) ASSERT_EQ(ptr[i], i); - /* Punch a hole after the first page address. */ - ret = munmap(buffer->ptr + self->page_size, self->page_size); + /* Migrate pages to device 1 and try to read from device 0. */ + ret = hmm_dmirror_cmd(self->fd1, HMM_DMIRROR_MIGRATE, buffer, npages); + ASSERT_EQ(ret, 0); + ASSERT_EQ(buffer->cpages, npages); + + ret = hmm_dmirror_cmd(self->fd0, HMM_DMIRROR_READ, buffer, npages); ASSERT_EQ(ret, 0); + ASSERT_EQ(buffer->cpages, npages); + ASSERT_EQ(buffer->faults, 1); + + /* Check what device 0 read. */ + for (i = 0, ptr = buffer->mirror; i < size / sizeof(*ptr); ++i) + ASSERT_EQ(ptr[i], i); hmm_buffer_free(buffer); }