From 19943b0e30b05d42e494ae6fef78156ebc8c637e Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Tue, 4 Aug 2009 16:19:20 +0100 Subject: intel-iommu: Unify hardware and software passthrough support This makes the hardware passthrough mode work a lot more like the software version, so that the behaviour of a kernel with 'iommu=pt' is the same whether the hardware supports passthrough or not. In particular: - We use a single si_domain for the pass-through devices. - 32-bit devices can be taken out of the pass-through domain so that they don't have to use swiotlb. - Devices will work again after being removed from a KVM guest. - A potential oops on OOM (in init_context_pass_through()) is fixed. Signed-off-by: David Woodhouse --- arch/x86/kernel/pci-swiotlb.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'arch/x86/kernel/pci-swiotlb.c') diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c index 6af96ee4420..1e66b18f45c 100644 --- a/arch/x86/kernel/pci-swiotlb.c +++ b/arch/x86/kernel/pci-swiotlb.c @@ -71,9 +71,8 @@ void __init pci_swiotlb_init(void) { /* don't initialize swiotlb if iommu=off (no_iommu=1) */ #ifdef CONFIG_X86_64 - if ((!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN) || - iommu_pass_through) - swiotlb = 1; + if ((!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN)) + swiotlb = 1; #endif if (swiotlb_force) swiotlb = 1; -- cgit v1.2.3-70-g09d2