From: Yiwen Jiang <jiangyiwen@huawei.com> euleros inclusion category: bugfix bugzilla: 46842 CVE: NA ------------------------------------------------- In the ARM64 architecture, zero physical address can be used for system ram, so virtual machine can allocate this segment of memory as vm's memory, but in vfio_unmap_unpin() if it found memory physical address is zero, it will call trace. By the way, x86 reserve 0~4k and avoid to happen this scenario. So avoid to call trace in the ARM64 architecture. Signed-off-by: Yiwen Jiang <jiangyiwen@huawei.com> Signed-off-by: Xiangyou Xie <xiexiangyou@huawei.com> Reviewed-by: Ying Fang <fangying1@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- drivers/vfio/vfio_iommu_type1.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 5a106963dd08..8c5c99aad00d 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -827,7 +827,9 @@ static long vfio_unmap_unpin(struct vfio_iommu *iommu, struct vfio_dma *dma, phys_addr_t phys, next; phys = iommu_iova_to_phys(domain->domain, iova); - if (WARN_ON(!phys)) { + if (!phys) { + pr_warn("%s: phys is 0, it's normal if arch is arm\n", + __func__); iova += PAGE_SIZE; continue; } -- 2.25.1