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Thu, 19 Mar 2026 13:26:11 -0700 (PDT) Received: from LQ5W56KC4T ([2001:8a0:672f:7800:e0e1:55cd:f0b:b1e5]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43b644ae16fsm1347544f8f.8.2026.03.19.13.26.10 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 19 Mar 2026 13:26:11 -0700 (PDT) From: Eric Curtin X-Google-Original-From: Eric Curtin To: linux-hyperv@vger.kernel.org Cc: linux-kernel@vger.kernel.org, iourit@linux.microsoft.com, wei.liu@kernel.org, decui@microsoft.com, haiyangz@microsoft.com Subject: [PATCH 52/55] drivers: hv: dxgkrnl: Use pin_user_pages instead of get_user_pages for DMA accessible memory Date: Thu, 19 Mar 2026 20:25:06 +0000 Message-ID: <20260319202509.63802-53-eric.curtin@docker.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260319202509.63802-1-eric.curtin@docker.com> References: <20260319202509.63802-1-eric.curtin@docker.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Iouri Tarassov Pages, which are obtained by calling get_user_pages(), can be evicted from memory. pin_user_pages() should be used for memory, which is accessed by DMA. Signed-off-by: Iouri Tarassov --- drivers/hv/dxgkrnl/dxgadapter.c | 2 +- drivers/hv/dxgkrnl/dxgvmbus.c | 12 ++++++++---- 2 files changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/hv/dxgkrnl/dxgadapter.c b/drivers/hv/dxgkrnl/dxgadapter.c index cf946e476411..c94283b09fa1 100644 --- a/drivers/hv/dxgkrnl/dxgadapter.c +++ b/drivers/hv/dxgkrnl/dxgadapter.c @@ -882,7 +882,7 @@ struct dxgallocation *dxgallocation_create(struct dxgprocess *process) void dxgallocation_stop(struct dxgallocation *alloc) { if (alloc->pages) { - release_pages(alloc->pages, alloc->num_pages); + unpin_user_pages(alloc->pages, alloc->num_pages); vfree(alloc->pages); alloc->pages = NULL; } diff --git a/drivers/hv/dxgkrnl/dxgvmbus.c b/drivers/hv/dxgkrnl/dxgvmbus.c index 467e7707c8c7..abb6d2af89ac 100644 --- a/drivers/hv/dxgkrnl/dxgvmbus.c +++ b/drivers/hv/dxgkrnl/dxgvmbus.c @@ -1457,6 +1457,7 @@ int create_existing_sysmem(struct dxgdevice *device, u64 *pfn; u32 pages_to_send; u32 i; + u32 gup_flags = FOLL_LONGTERM; struct dxgglobal *dxgglobal = dxggbl(); /* @@ -1475,12 +1476,15 @@ int create_existing_sysmem(struct dxgdevice *device, ret = -ENOMEM; goto cleanup; } - ret1 = get_user_pages_fast((unsigned long)sysmem, npages, !read_only, - dxgalloc->pages); + if (!read_only) + gup_flags |= FOLL_WRITE; + ret1 = pin_user_pages_fast((unsigned long)sysmem, npages, gup_flags, + dxgalloc->pages); if (ret1 != npages) { DXG_ERR("get_user_pages_fast failed: %d", ret1); - if (ret1 > 0 && ret1 < npages) - release_pages(dxgalloc->pages, ret1); + if (ret1 > 0 && ret1 < npages) { + unpin_user_pages(dxgalloc->pages, ret1); + } vfree(dxgalloc->pages); dxgalloc->pages = NULL; ret = -ENOMEM;