Jay Cornwall 96c211f1f9
drm/amdkfd: Relocate TBA/TMA to opposite side of VM hole ...
The TBA and TMA, along with an unused IB allocation, reside at low
addresses in the VM address space. A stray VM fault which hits these
pages must be serviced by making their page table entries invalid.
The scheduler depends upon these pages being resident and fails,
preventing a debugger from inspecting the failure state.
By relocating these pages above 47 bits in the VM address space they
can only be reached when bits [63:48] are set to 1. This makes it much
less likely for a misbehaving program to generate accesses to them.
The current placement at VA (PAGE_SIZE*2) is readily hit by a NULL
access with a small offset.
Signed-off-by: Jay Cornwall <jay.cornwall@amd.com >
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com >
Signed-off-by: Alex Deucher <alexander.deucher@amd.com >
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96c211f1f9