acrn-hypervisor

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Wei Liu 0cdc13fa0e hv: extend the AC bit of rflags operations for smap

For apl_sdc_stable branch, we now have stac and clac to set and
clear AC bit of rflags. But it can't handle following sequence:
     stac
       stac
       clac
       user mode address access here will trigger page fault
     clac

This patch introduce two more functions:
     - stac_save: Save the rflags and set AC bit
     - ac_restore: Restore the AC bit saved to rflags

Now, only sbuf_put/get are using these new APIs.

Tracked-On: #2525
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>

2019-02-15 14:38:53 +08:00