On 11/27/15 at 12:24pm, Joerg Roedel wrote:
> On Fri, Nov 06, 2015 at 08:10:48PM +0800, Baoquan He wrote:
> >
> > +static void copy_command_buffer(void)
> > +
> > +static void copy_event_buffer(void)
> > +{
>
> There is no need to copy any of these buffers. For the command buffer
> you just need to safely reinialize the hardware to use your newly
> allocated buffer.
>
> Same for the event buffer. But here it makes sense to actually check the
> old event buffer for content and print out the errors the old kernel
> didn't get a chance to handle before the crash.
OK, will check the old event buffer and then call
iommu_enable_command_buffer()/iommu_enable_event_buffer().
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