On Tue, Aug 06, 2019 at 04:06:58PM +0200, Lucas Stach wrote: > > dma_direct_free_pages() then needs the same check, as otherwise the cpu > address is treated as a cookie instead of a real address and the > encryption needs to be re-enabled.
Ok, lets try this one instead: -- >From 3a7aa9fe38a5eae5d879831b4f8c1032e735a0b6 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig <h...@lst.de> Date: Tue, 6 Aug 2019 14:33:23 +0300 Subject: dma-direct: fix DMA_ATTR_NO_KERNEL_MAPPING The new DMA_ATTR_NO_KERNEL_MAPPING needs to actually assign a dma_addr to work. Also skip it if the architecture needs forced decryption handling, as that needs a kernel virtual address. Fixes: d98849aff879 (dma-direct: handle DMA_ATTR_NO_KERNEL_MAPPING in common code) Signed-off-by: Christoph Hellwig <h...@lst.de> --- kernel/dma/direct.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 59bdceea3737..4c211c87a719 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -130,11 +130,13 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size, if (!page) return NULL; - if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) { + if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) && + !force_dma_unencrypted(dev)) { /* remove any dirty cache lines on the kernel alias */ if (!PageHighMem(page)) arch_dma_prep_coherent(page, size); /* return the page pointer as the opaque cookie */ + *dma_handle = phys_to_dma(dev, page_to_phys(page)); return page; } @@ -178,7 +180,8 @@ void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr, { unsigned int page_order = get_order(size); - if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) { + if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) && + !force_dma_unencrypted(dev)) { /* cpu_addr is a struct page cookie, not a kernel address */ __dma_direct_free_pages(dev, size, cpu_addr); return; -- 2.20.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu