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Diffstat (limited to 'roms/skiboot/doc/vas.rst')
| -rw-r--r-- | roms/skiboot/doc/vas.rst | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/roms/skiboot/doc/vas.rst b/roms/skiboot/doc/vas.rst new file mode 100644 index 000000000..4a326a129 --- /dev/null +++ b/roms/skiboot/doc/vas.rst @@ -0,0 +1,16 @@ +Virtual Accelerator Switchboard (VAS) +===================================== + +This document provides information about using VAS from user space. +Applications send NX requests using COPY/PASTE instructions. NX raises +an interrupt when it sees fault on the request buffer. Kernel handles +the interrupt and process the fault. + +Skiboot allocates the IRQ and exports it with interrupts property. To +provide backward compatibility for older kernels, enable VAS user space +support with NVRAM command. + + nvram -p ibm,skiboot --update-config vas-user-space=enable + +This nvram config update is temporary and can be removed in future if +not needed. |