acrn-hypervisor/hypervisor/arch
Zheng, Gen a06f2d68dc HV: bug fix in operating softirq
Current code is missing to handle the following race condition:

   Before:

     sti
      |
      V
handle softirq with
a while loop
      |          <----- if a new softirq generated at this point,
      V                 it will be missed to be handled.
     cli
      |
      V
return with unclear softirq bitmap

    After:

again:
     sti
      |
      V
handle softirq with
a while loop
      |
      V
     cli
      |
      V
check if a new softirq generated, if yes,
jump back to above again lable point,
and do a while loop again.
      |
      V
return with clear softirq bitmap

Signed-off-by: Zheng, Gen <gen.zheng@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
2018-06-14 13:41:12 +08:00
..
x86 HV: bug fix in operating softirq 2018-06-14 13:41:12 +08:00