From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-f50.google.com (mail-qg0-f50.google.com [209.85.192.50]) by kanga.kvack.org (Postfix) with ESMTP id 7F13F82F61 for ; Thu, 13 Aug 2015 15:37:57 -0400 (EDT) Received: by qgj62 with SMTP id 62so38396224qgj.2 for ; Thu, 13 Aug 2015 12:37:57 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id a38si5459169qkh.67.2015.08.13.12.37.56 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 13 Aug 2015 12:37:56 -0700 (PDT) From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= Subject: [PATCH 05/15] HMM: handle HMM device page table entry on mirror page table fault and update. Date: Thu, 13 Aug 2015 15:37:21 -0400 Message-Id: <1439494651-1255-6-git-send-email-jglisse@redhat.com> In-Reply-To: <1439494651-1255-1-git-send-email-jglisse@redhat.com> References: <1439494651-1255-1-git-send-email-jglisse@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Linus Torvalds , joro@8bytes.org, Mel Gorman , "H. Peter Anvin" , Peter Zijlstra , Andrea Arcangeli , Johannes Weiner , Larry Woodman , Rik van Riel , Dave Airlie , Brendan Conoboy , Joe Donohue , Christophe Harle , Duncan Poole , Sherry Cheung , Subhash Gutti , John Hubbard , Mark Hairgrove , Lucien Dunning , Cameron Buschardt , Arvind Gopalakrishnan , Haggai Eran , Shachar Raindel , Liran Liss , Roland Dreier , Ben Sander , Greg Stoner , John Bridgman , Michael Mantor , Paul Blinzer , Leonid Shamis , Laurent Morichetti , Alexander Deucher , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= When faulting or updating the device page table properly handle the case of device memory entry. Signed-off-by: JA(C)rA'me Glisse --- mm/hmm.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/mm/hmm.c b/mm/hmm.c index 08c0160..8b1003a 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -607,6 +607,13 @@ static void hmm_mirror_update_pte(struct hmm_mirror *mirror, goto out; } + if (hmm_pte_test_valid_dev(hmm_pte)) { + *hmm_pte &= event->pte_mask; + if (!hmm_pte_test_valid_dev(hmm_pte)) + hmm_pt_iter_directory_unref(iter); + return; + } + if (!hmm_pte_test_valid_dma(hmm_pte)) return; @@ -795,6 +802,12 @@ static int hmm_mirror_fault_pmd(pmd_t *pmdp, ptep = pte_offset_map(pmdp, start); hmm_pt_iter_directory_lock(iter); do { + if (hmm_pte_test_valid_dev(&hmm_pte[i])) { + if (write) + hmm_pte_set_write(&hmm_pte[i]); + continue; + } + if (!pte_present(*ptep) || (write && !pte_write(*ptep))) { ret = -ENOENT; -- 1.9.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org