From 7366aeb77cd840f3edea02c65065d40affaa7f45 Mon Sep 17 00:00:00 2001 From: Xiaolin Zhang Date: Thu, 18 Jul 2019 01:10:24 +0800 Subject: [PATCH] drm/i915/gvt: fix incorrect cache entry for guest page mapping GPU hang observed during the guest OCL conformance test which is caused by THP GTT feature used durning the test. It was observed the same GFN with different size (4K and 2M) requested from the guest in GVT. So during the guest page dma map stage, it is required to unmap first with orginal size and then remap again with requested size. Fixes: b901b252b6cf ("drm/i915/gvt: Add 2M huge gtt support") Cc: stable@vger.kernel.org Reviewed-by: Zhenyu Wang Signed-off-by: Xiaolin Zhang Signed-off-by: Zhenyu Wang --- drivers/gpu/drm/i915/gvt/kvmgt.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index 144301b778df..23aa3e50cbf8 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -1904,6 +1904,18 @@ static int kvmgt_dma_map_guest_page(unsigned long handle, unsigned long gfn, entry = __gvt_cache_find_gfn(info->vgpu, gfn); if (!entry) { + ret = gvt_dma_map_page(vgpu, gfn, dma_addr, size); + if (ret) + goto err_unlock; + + ret = __gvt_cache_add(info->vgpu, gfn, *dma_addr, size); + if (ret) + goto err_unmap; + } else if (entry->size != size) { + /* the same gfn with different size: unmap and re-map */ + gvt_dma_unmap_page(vgpu, gfn, entry->dma_addr, entry->size); + __gvt_cache_remove_entry(vgpu, entry); + ret = gvt_dma_map_page(vgpu, gfn, dma_addr, size); if (ret) goto err_unlock; -- GitLab