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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 14 Jan 2019 09:54:46 -0000 Received: from b01ledav005.gho.pok.ibm.com (b01ledav005.gho.pok.ibm.com [9.57.199.110]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x0E9sjA524903800 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 14 Jan 2019 09:54:45 GMT Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8635CAE063; Mon, 14 Jan 2019 09:54:45 +0000 (GMT) Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 138DAAE066; Mon, 14 Jan 2019 09:54:43 +0000 (GMT) Received: from skywalker.in.ibm.com (unknown [9.124.31.106]) by b01ledav005.gho.pok.ibm.com (Postfix) with ESMTP; Mon, 14 Jan 2019 09:54:42 +0000 (GMT) From: "Aneesh Kumar K.V" To: akpm@linux-foundation.org, Michal Hocko , Alexey Kardashevskiy , David Gibson , Andrea Arcangeli , mpe@ellerman.id.au Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, "Aneesh Kumar K.V" Subject: [PATCH V7 0/4] mm/kvm/vfio/ppc64: Migrate compound pages out of CMA region Date: Mon, 14 Jan 2019 15:24:32 +0530 X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19011409-0068-0000-0000-000003825C2E X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010402; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000274; SDB=6.01146284; UDB=6.00597007; IPR=6.00926570; MB=3.00025118; MTD=3.00000008; XFM=3.00000015; UTC=2019-01-14 09:54:49 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19011409-0069-0000-0000-000047206E1C Message-Id: <20190114095438.32470-1-aneesh.kumar@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-01-14_05:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=749 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901140081 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ppc64 use CMA area for the allocation of guest page table (hash page table). We won't be able to start guest if we fail to allocate hash page table. We have observed hash table allocation failure because we failed to migrate pages out of CMA region because they were pinned. This happen when we are using VFIO. VFIO on ppc64 pins the entire guest RAM. If the guest RAM pages get allocated out of CMA region, we won't be able to migrate those pages. The pages are also pinned for the lifetime of the guest. Currently we support migration of non-compound pages. With THP and with the addition of hugetlb migration we can end up allocating compound pages from CMA region. This patch series add support for migrating compound pages. Changes from V6: * use get_user_pages_longterm instead of get_user_pages_cma_migrate() Changes from V5: * Add PF_MEMALLOC_NOCMA * remote __GFP_THISNODE when allocating target page for migration Changes from V4: * use __GFP_NOWARN when allocating pages to avoid page allocation failure warnings. Changes from V3: * Move the hugetlb check before transhuge check * Use compound head page when isolating hugetlb page Aneesh Kumar K.V (4): mm/cma: Add PF flag to force non cma alloc mm: Update get_user_pages_longterm to migrate pages allocated from CMA region powerpc/mm/iommu: Allow migration of cma allocated pages during mm_iommu_do_alloc powerpc/mm/iommu: Allow large IOMMU page size only for hugetlb backing arch/powerpc/mm/mmu_context_iommu.c | 146 ++++++-------------- include/linux/hugetlb.h | 2 + include/linux/mm.h | 3 +- include/linux/sched.h | 1 + include/linux/sched/mm.h | 48 +++++-- mm/gup.c | 200 ++++++++++++++++++++++++---- mm/hugetlb.c | 4 +- 7 files changed, 267 insertions(+), 137 deletions(-) -- 2.20.1