Quoting Chris Wilson (2018-06-10 22:43:10)
> An issue encountered with switching mm on gen7 is that the GPU likes to
> hang (with the VS unit busy) when told to force restore the current
> context. We can simply workaround this by substituting the
> MI_FORCE_RESTORE flag with a round-trip through the kernel_context,
> forcing the context to be saved and restored; thereby reloading the
> PP_DIR registers and updating the modified page directory!
> 
> Signed-off-by: Chris Wilson <[email protected]>
> Cc: Joonas Lahtinen <[email protected]>
> Cc: Mika Kuoppala <[email protected]>
> Cc: Matthew Auld <[email protected]>

Commit message checks out with code, and as you obviously have it
crunching through the testsuites, must be the right thing to do.

Reviewed-by: Joonas Lahtinen <[email protected]>

Regards, Joonas
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