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| author | David Woodhouse <David.Woodhouse@intel.com> | 2009-08-04 16:19:20 +0100 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-08-04 16:19:23 +0100 |
| commit | 19943b0e30b05d42e494ae6fef78156ebc8c637e (patch) | |
| tree | 1c7e1dffac6ee9f0fb5920078475ad19e8919c5b /arch | |
| parent | 0815565adfe3f4c369110c57d8ffe83caefeed68 (diff) | |
| download | lwn-19943b0e30b05d42e494ae6fef78156ebc8c637e.tar.gz lwn-19943b0e30b05d42e494ae6fef78156ebc8c637e.zip | |
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 <David.Woodhouse@intel.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/pci-swiotlb.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c index 6af96ee44200..1e66b18f45cb 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; |