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Mon, 16 Jun 2025 21:18:49 -0700 (PDT) From: lizhe.67@bytedance.com To: alex.williamson@redhat.com, akpm@linux-foundation.org, david@redhat.com, peterx@redhat.com Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lizhe.67@bytedance.com Subject: [PATCH v4 1/3] vfio/type1: batch vfio_find_vpfn() in function vfio_unpin_pages_remote() Date: Tue, 17 Jun 2025 12:18:19 +0800 Message-ID: <20250617041821.85555-2-lizhe.67@bytedance.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20250617041821.85555-1-lizhe.67@bytedance.com> References: <20250617041821.85555-1-lizhe.67@bytedance.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Li Zhe This patch is based on patch 'vfio/type1: optimize vfio_pin_pages_remote() for large folios'[1]. The function vpfn_pages() can help us determine the number of vpfn nodes on the vpfn rb tree within a specified range. This allows us to avoid searching for each vpfn individually in the function vfio_unpin_pages_remote(). This patch batches the vfio_find_vpfn() calls in function vfio_unpin_pages_remote(). [1]: https://lore.kernel.org/all/20250529064947.38433-1-lizhe.67@bytedance.= com/ Signed-off-by: Li Zhe --- drivers/vfio/vfio_iommu_type1.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type= 1.c index 28ee4b8d39ae..e952bf8bdfab 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -805,16 +805,12 @@ static long vfio_unpin_pages_remote(struct vfio_dma *= dma, dma_addr_t iova, unsigned long pfn, unsigned long npage, bool do_accounting) { - long unlocked =3D 0, locked =3D 0; + long unlocked =3D 0, locked =3D vpfn_pages(dma, iova, npage); long i; =20 - for (i =3D 0; i < npage; i++, iova +=3D PAGE_SIZE) { - if (put_pfn(pfn++, dma->prot)) { + for (i =3D 0; i < npage; i++) + if (put_pfn(pfn++, dma->prot)) unlocked++; - if (vfio_find_vpfn(dma, iova)) - locked++; - } - } =20 if (do_accounting) vfio_lock_acct(dma, locked - unlocked, true); --=20 2.20.1