On Thu, 15 Feb 2018 21:03:17 +0000, Christoffer Dall wrote: > > We are about to defer saving and restoring some groups of system > registers to vcpu_put and vcpu_load on supported systems. This means > that we need some infrastructure to access system registes which > supports either accessing the memory backing of the register or directly > accessing the system registers, depending on the state of the system > when we access the register. > > We do this by defining read/write accessor functions, which can handle > both "immediate" and "deferrable" system registers. Immediate registers > are always saved/restored in the world-switch path, but deferrable > registers are only saved/restored in vcpu_put/vcpu_load when supported > and sysregs_loaded_on_cpu will be set in that case. > > Note that we don't use the deferred mechanism yet in this patch, but only > introduce infrastructure. This is to improve convenience of review in > the subsequent patches where it is clear which registers become > deferred. > > Signed-off-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx> Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx> M. -- Jazz is not dead, it just smell funny.
