On Fri, Nov 06, 2015 at 08:10:42PM +0800, Baoquan He wrote:
> This is v2 draft patch set. It mainly functions as the following steps:
>
> 1. Checking if it's in kdump kernel and previously enabled
> 2. If yes do below operatons:
> a. Do not disable amd iommu and do not touch dev tables before coping old
> dev tables
> b. Copy dev table from old kernel and set the old domain id in
> amd_iommu_pd_alloc_bitmap
> c. Copy irq tables from old kernel
> d. Copy command buffer and event buffer
> e. Don't call update_domain() to set domain->pt_root to dev entries
> before device driver initialization.
> f. Reset the pre-enabled status in case IOMMU_DMA_OPS of state_next().
>
> Existed problems:
"Existed" means here these problems are gone?
>
> 1. It always prints the following message whenever do a flush:
>
> "AMD-Vi: Completion-Wait loop timed out"
>
> 2. Maybe there's someing wrong with the old irq remapping handling, the hard
> disk can't be brought up
> successfully. You can check the attached kdump kernel boot log with this
> patchset applied.
The reason is most likely that you didn't re-initialize the command
buffer before doing any flushes. The you see the above Completion-Wait
loop timeouts.
Joerg
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