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vm_session: consume spurious wakeups on nova 

Issue #3111
This commit is contained in:
Alexander Boettcher 2019-05-15 13:23:36 +02:00 committed by Christian Helmuth
parent 9f70084524
commit 07ee9654e4
1 changed files with 7 additions and 8 deletions
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15
repos/base-nova/src/lib/base/vm_session.cc
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@ -459,16 +459,15 @@ struct Vcpu {
Vm_state &state = *reinterpret_cast<Vm_state *>(vcpu->_state);
/* transform state from NOVA to Genode */
if (exit_reason != VM_EXIT_RECALL)
if (exit_reason != VM_EXIT_RECALL || !previous_blocked)
_read_nova_state(utcb, state, exit_reason);
else {
/* consume potential multiple sem ups */
Nova::sm_ctrl(vcpu->_sm_sel(), Nova::SEMAPHORE_UP);
Nova::sm_ctrl(vcpu->_sm_sel(), Nova::SEMAPHORE_DOWNZERO);
if (!previous_blocked)
_read_nova_state(utcb, state, exit_reason);
else
/* consume potential multiple sem ups */
Nova::sm_ctrl(vcpu->_sm_sel(), Nova::SEMAPHORE_UP);
Nova::sm_ctrl(vcpu->_sm_sel(), Nova::SEMAPHORE_DOWNZERO);
if (exit_reason == VM_EXIT_RECALL) {
if (previous_blocked)
state.exit_reason = exit_reason;
if (vcpu->_remote == PAUSE) {