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kvm: Add support for disabling coalesced MMIO

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Add the option useCoalescedMMIO to the BaseKvmCPU. The default
behavior is to disable coalesced MMIO since this hasn't been heavily
tested.
This commit is contained in:
Andreas Sandberg 2013-05-14 16:02:45 +02:00
parent 3ba93822cc
commit 4e52789c6d
2 changed files with 7 additions and 1 deletions
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1
src/cpu/kvm/BaseKvmCPU.py
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@ -69,5 +69,6 @@ class BaseKvmCPU(BaseCPU):
return True return True
kvmVM = Param.KvmVM(Parent.any, 'KVM VM (i.e., shared memory domain)') 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)") usePerfOverflow = Param.Bool(False, "Use perf event overflow counters (EXPERIMENTAL)")
hostFactor = Param.Float(1.0, "Cycle scale factor") hostFactor = Param.Float(1.0, "Cycle scale factor")

7
src/cpu/kvm/base.cc
View file

@ -133,6 +133,9 @@ BaseKvmCPU::init()
void void
BaseKvmCPU::startup() BaseKvmCPU::startup()
{ {
const BaseKvmCPUParams * const p(
dynamic_cast<const BaseKvmCPUParams *>(params()));
Kvm &kvm(vm.kvm); Kvm &kvm(vm.kvm);
BaseCPU::startup(); BaseCPU::startup();
@ -159,7 +162,9 @@ BaseKvmCPU::startup()
// available. The offset into the KVM's communication page is // available. The offset into the KVM's communication page is
// provided by the coalesced MMIO capability. // provided by the coalesced MMIO capability.
int mmioOffset(kvm.capCoalescedMMIO()); int mmioOffset(kvm.capCoalescedMMIO());
if (mmioOffset) { if (!p->useCoalescedMMIO) {
inform("KVM: Coalesced MMIO disabled by config.\n");
} else if (mmioOffset) {
inform("KVM: Coalesced IO available\n"); inform("KVM: Coalesced IO available\n");
mmioRing = (struct kvm_coalesced_mmio_ring *)( mmioRing = (struct kvm_coalesced_mmio_ring *)(
(char *)_kvmRun + (mmioOffset * pageSize)); (char *)_kvmRun + (mmioOffset * pageSize));