diff options
Diffstat (limited to 'src/cpu/kvm/base.hh')
| -rw-r--r-- | src/cpu/kvm/base.hh | 59 |
1 files changed, 54 insertions, 5 deletions
diff --git a/src/cpu/kvm/base.hh b/src/cpu/kvm/base.hh index 3c299ce4e..103808365 100644 --- a/src/cpu/kvm/base.hh +++ b/src/cpu/kvm/base.hh @@ -53,6 +53,9 @@ /** Signal to use to trigger time-based exits from KVM */ #define KVM_TIMER_SIGNAL SIGRTMIN +/** Signal to use to trigger instruction-based exits from KVM */ +#define KVM_INST_SIGNAL (SIGRTMIN+1) + // forward declarations class ThreadContext; struct BaseKvmCPUParams; @@ -615,9 +618,6 @@ class BaseKvmCPU : public BaseCPU */ bool discardPendingSignal(int signum) const; - /** Setup hardware performance counters */ - void setupCounters(); - /** Try to drain the CPU if a drain is pending */ bool tryDrain(); @@ -647,11 +647,59 @@ class BaseKvmCPU : public BaseCPU TickEvent tickEvent; + /** + * Setup an instruction break if there is one pending. + * + * Check if there are pending instruction breaks in the CPU's + * instruction event queue and schedule an instruction break using + * PerfEvent. + * + * @note This method doesn't currently handle the main system + * instruction event queue. + */ + void setupInstStop(); + /** @{ */ - /** Guest performance counters */ + /** Setup hardware performance counters */ + void setupCounters(); + + /** + * Setup the guest instruction counter. + * + * Setup the guest instruction counter and optionally request a + * signal every N instructions executed by the guest. This method + * will re-attach the counter if the counter has already been + * attached and its sampling settings have changed. + * + * @param period Signal period, set to 0 to disable signaling. + */ + void setupInstCounter(uint64_t period = 0); + + /** Currently active instruction count breakpoint */ + uint64_t activeInstPeriod; + + /** + * Guest cycle counter. + * + * This is the group leader of all performance counters measuring + * the guest system. It can be used in conjunction with the + * PerfKvmTimer (see perfControlledByTimer) to trigger exits from + * KVM. + */ PerfKvmCounter hwCycles; + + /** + * Guest instruction counter. + * + * This counter is typically only used to measure the number of + * instructions executed by the guest. However, it can also be + * used to trigger exits from KVM if the configuration script + * requests an exit after a certain number of instructions. + * + * @see setupInstBreak + * @see scheduleInstStop + */ PerfKvmCounter hwInstructions; - /** @} */ /** * Does the runTimer control the performance counters? @@ -661,6 +709,7 @@ class BaseKvmCPU : public BaseCPU * exits. */ bool perfControlledByTimer; + /** @} */ /** * Timer used to force execution into the monitor after a |