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Wed, 20 Oct 2021 18:52:41 GMT Received: from monad.us.oracle.com (dhcp-10-159-132-124.vpn.oracle.com [10.159.132.124]) by userp3030.oracle.com with ESMTP id 3bqkv0hh7s-1; Wed, 20 Oct 2021 18:52:41 +0000 From: Ankur Arora To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Cc: mingo@kernel.org, bp@alien8.de, luto@kernel.org, akpm@linux-foundation.org, mike.kravetz@oracle.com, jon.grimm@amd.com, kvm@vger.kernel.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, Ankur Arora , alex.williamson@redhat.com Subject: [PATCH v2 13/14] vfio_iommu_type1: specify FOLL_HINT_BULK to pin_user_pages() Date: Wed, 20 Oct 2021 11:52:07 -0700 Message-Id: <20211020185207.18509-1-ankur.a.arora@oracle.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20211020170305.376118-1-ankur.a.arora@oracle.com> References: <20211020170305.376118-1-ankur.a.arora@oracle.com> MIME-Version: 1.0 X-Proofpoint-GUID: kyJVys3aFUyKJefJejJSe5ZCKu_C4bvd X-Proofpoint-ORIG-GUID: kyJVys3aFUyKJefJejJSe5ZCKu_C4bvd X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 5A429B0000A3 X-Stat-Signature: s748tccd5gonumtjfgr7c495kb7jyemg Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2021-07-09 header.b=SCcnCfmH; dmarc=pass (policy=none) header.from=oracle.com; spf=none (imf19.hostedemail.com: domain of ankur.a.arora@oracle.com has no SPF policy when checking 205.220.177.32) smtp.mailfrom=ankur.a.arora@oracle.com X-HE-Tag: 1634755966-601453 Content-Transfer-Encoding: quoted-printable 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: Specify FOLL_HINT_BULK to pin_user_pages() so it is aware that this pin is part of a larger region being pinned, so it can optimize based on that expectation. Cc: alex.williamson@redhat.com Signed-off-by: Ankur Arora --- drivers/vfio/vfio_iommu_type1.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_ty= pe1.c index 0e9217687f5c..0d45b0c6464d 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -557,6 +557,9 @@ static int vaddr_get_pfns(struct mm_struct *mm, unsig= ned long vaddr, if (prot & IOMMU_WRITE) flags |=3D FOLL_WRITE; =20 + /* Tell gup that this iterations is part of larger set of pins. */ + flags |=3D FOLL_HINT_BULK; + mmap_read_lock(mm); ret =3D pin_user_pages_remote(mm, vaddr, npages, flags | FOLL_LONGTERM, pages, NULL, NULL); --=20 2.29.2