hey Andi, Debian is looking at patching our kernel to disable the hw iommu on nvidia chipsets for the data corruption bug that's been discussed on lkml[1]. As far as I can tell there isn't an upstream solution yet, but Steve Langasek has proposed the following patch which seems to work for one of our users. Would you mind taking a look at it and see if you can pick out any obvious problems?
The full text of this discussion can be found at: http://bugs.debian.org/404148 [1] http://marc.info/?l=linux-kernel&m=116898325616149&w=2 --- a/arch/x86_64/kernel/io_apic.c 2007-03-22 00:54:33.000000000 -0700 +++ b/arch/x86_64/kernel/io_apic.c 2007-03-22 01:13:06.000000000 -0700 @@ -344,6 +344,22 @@ "timer override.\n"); } #endif +#ifdef CONFIG_IOMMU + /* Forcibly disabling nvidia HW iommu, + per Debian bug #404148. */ + if ((end_pfn > MAX_DMA32_PFN || + force_iommu) && + !iommu_aperture_allowed) { + printk(KERN_INFO + "Looks like an nvidia chipset. Disabling HW IOMMU. Override with \"iommu=allowed\"\n"); +#ifdef CONFIG_SWIOTLB + swiotlb = 1; +#else + no_iommu = 1; +#endif + } +#endif + /* RED-PEN skip them on mptables too? */ return; -- dann frazier -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
