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Mon, 07 Dec 2020 03:35:41 -0800 (PST) From: yulei.kernel@gmail.com X-Google-Original-From: yuleixzhang@tencent.com To: linux-mm@kvack.org, akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, naoya.horiguchi@nec.com, viro@zeniv.linux.org.uk, pbonzini@redhat.com Cc: joao.m.martins@oracle.com, rdunlap@infradead.org, sean.j.christopherson@intel.com, xiaoguangrong.eric@gmail.com, kernellwp@gmail.com, lihaiwei.kernel@gmail.com, Yulei Zhang , Chen Zhuo Subject: [RFC V2 36/37] vfio: support dmempage refcount for vfio Date: Mon, 7 Dec 2020 19:31:29 +0800 Message-Id: <0e5dd1479a55d8af7adfe44390f8e45186295dce.1607332046.git.yuleixzhang@tencent.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: References: MIME-Version: 1.0 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: From: Yulei Zhang Add get/put_dmem_pfn(), each time when vfio module reference/release dmempages. Signed-off-by: Chen Zhuo Signed-off-by: Yulei Zhang --- drivers/vfio/vfio_iommu_type1.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_ty= pe1.c index c465d1a..4856a89 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -39,6 +39,7 @@ #include #include #include +#include =20 #define DRIVER_VERSION "0.2" #define DRIVER_AUTHOR "Alex Williamson " @@ -411,7 +412,10 @@ static int put_pfn(unsigned long pfn, int prot) =20 unpin_user_pages_dirty_lock(&page, 1, prot & IOMMU_WRITE); return 1; - } + } else if (is_dmem_pfn(pfn)) + put_dmem_pfn(pfn); + + /* Dmem page is not counted against user. */ return 0; } =20 @@ -477,6 +481,9 @@ static int vaddr_get_pfn(struct mm_struct *mm, unsign= ed long vaddr, =20 if (!ret && !is_invalid_reserved_pfn(*pfn)) ret =3D -EFAULT; + + if (!ret && is_dmem_pfn(*pfn)) + get_dmem_pfn(*pfn); } done: mmap_read_unlock(mm); --=20 1.8.3.1