> it seems like we do for some reason never actually enable swiotlb
> for 32-bit x86. Before my commit the block bounce buffering papered
> over that for networking, Please try this patch:
>
> diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
> index 661583662430..71c0b01d93b1 100644
> --- a/arch/x86/kernel/pci-swiotlb.c
> +++ b/arch/x86/kernel/pci-swiotlb.c
> @@ -42,10 +42,8 @@ IOMMU_INIT_FINISH(pci_swiotlb_detect_override,
> int __init pci_swiotlb_detect_4gb(void)
> {
> /* don't initialize swiotlb if iommu=off (no_iommu=1) */
> -#ifdef CONFIG_X86_64
> if (!no_iommu && max_possible_pfn > MAX_DMA32_PFN)
> swiotlb = 1;
> -#endif
>
> /*
> * If SME is active then swiotlb will be set to 1 so that bounce
Christoph,
your patch fixed it nicely. No more error messages when I boot with
16GiB enabled on a 32-bit PAE-enabled system.
- Matthew Whitehead
