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-rw-r--r--src/cpu/kvm/BaseKvmCPU.py2
-rw-r--r--src/cpu/kvm/base.cc7
-rw-r--r--src/cpu/kvm/base.hh6
3 files changed, 15 insertions, 0 deletions
diff --git a/src/cpu/kvm/BaseKvmCPU.py b/src/cpu/kvm/BaseKvmCPU.py
index b7c964669..34ab752de 100644
--- a/src/cpu/kvm/BaseKvmCPU.py
+++ b/src/cpu/kvm/BaseKvmCPU.py
@@ -71,6 +71,8 @@ class BaseKvmCPU(BaseCPU):
kvmVM = Param.KvmVM(Parent.any, 'KVM VM (i.e., shared memory domain)')
useCoalescedMMIO = Param.Bool(False, "Use coalesced MMIO (EXPERIMENTAL)")
usePerfOverflow = Param.Bool(False, "Use perf event overflow counters (EXPERIMENTAL)")
+ alwaysSyncTC = Param.Bool(False,
+ "Always sync thread contexts on entry/exit")
hostFreq = Param.Clock("2GHz", "Host clock frequency")
hostFactor = Param.Float(1.0, "Cycle scale factor")
diff --git a/src/cpu/kvm/base.cc b/src/cpu/kvm/base.cc
index ea0f494e3..bf4d68603 100644
--- a/src/cpu/kvm/base.cc
+++ b/src/cpu/kvm/base.cc
@@ -69,6 +69,7 @@ BaseKvmCPU::BaseKvmCPU(BaseKvmCPUParams *params)
_status(Idle),
dataPort(name() + ".dcache_port", this),
instPort(name() + ".icache_port", this),
+ alwaysSyncTC(params->alwaysSyncTC),
threadContextDirty(true),
kvmStateDirty(false),
vcpuID(vm.allocVCPUID()), vcpuFD(-1), vcpuMMapSize(0),
@@ -557,6 +558,9 @@ BaseKvmCPU::tick()
nextInstEvent > ctrInsts ?
curEventQueue()->nextTick() - curTick() : 0);
+ if (alwaysSyncTC)
+ threadContextDirty = true;
+
// We might need to update the KVM state.
syncKvmState();
@@ -588,6 +592,9 @@ BaseKvmCPU::tick()
// dirty with respect to the cached thread context.
kvmStateDirty = true;
+ if (alwaysSyncTC)
+ syncThreadContext();
+
// Enter into the RunningService state unless the
// simulation was stopped by a timer.
if (_kvmRun->exit_reason != KVM_EXIT_INTR) {
diff --git a/src/cpu/kvm/base.hh b/src/cpu/kvm/base.hh
index dd27328be..7ff0cab5c 100644
--- a/src/cpu/kvm/base.hh
+++ b/src/cpu/kvm/base.hh
@@ -575,6 +575,12 @@ class BaseKvmCPU : public BaseCPU
KVMCpuPort instPort;
/**
+ * Be conservative and always synchronize the thread context on
+ * KVM entry/exit.
+ */
+ const bool alwaysSyncTC;
+
+ /**
* Is the gem5 context dirty? Set to true to force an update of
* the KVM vCPU state upon the next call to kvmRun().
*/