Shuo A Liu 38cd5b481d hv: keylocker: host keylocker iwkey context switch ...

Different vCPU may have different IWKeys. Hypervisor need do the iwkey
context switch.

This patch introduce a load_iwkey() function to do that. Switches the
host iwkey when the switch_in vCPU satisfies:
  1) keylocker feature enabled
  2) Different from the current loaded one.

Two opportunities to do the load_iwkey():
  1) Guest enables CR4.KL bit.
  2) vCPU thread context switch.

load_iwkey() costs ~600 cycles when do the load IWKey action.

Tracked-On: #5695
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

2021-02-03 13:54:45 +08:00

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