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Virtual machine halt detection is turned on by default. Allow it to be

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disabled via the tunable 'hw.vmm.halt_detection'.
This commit is contained in:
Neel Natu 2014-05-05 16:19:24 +00:00
parent 1237b6d9ed
commit 055fc2cb5e
1 changed files with 11 additions and 1 deletions
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12
sys/amd64/vmm/vmm.c
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@ -189,6 +189,16 @@ static VMM_STAT(VCPU_TOTAL_RUNTIME, "vcpu total runtime");
SYSCTL_NODE(_hw, OID_AUTO, vmm, CTLFLAG_RW, NULL, NULL);
/*
* Halt the guest if all vcpus are executing a HLT instruction with
* interrupts disabled.
*/
static int halt_detection_enabled = 1;
TUNABLE_INT("hw.vmm.halt_detection", &halt_detection_enabled);
SYSCTL_INT(_hw_vmm, OID_AUTO, halt_detection, CTLFLAG_RDTUN,
&halt_detection_enabled, 0,
"Halt VM if all vcpus execute HLT with interrupts disabled");
static int vmm_ipinum;
SYSCTL_INT(_hw_vmm, OID_AUTO, ipinum, CTLFLAG_RD, &vmm_ipinum, 0,
"IPI vector used for vcpu notifications");
@ -1047,7 +1057,7 @@ vm_handle_hlt(struct vm *vm, int vcpuid, bool intr_disabled, bool *retu)
if (intr_disabled) {
wmesg = "vmhalt";
VCPU_CTR0(vm, vcpuid, "Halted");
if (!vcpu_halted) {
if (!vcpu_halted && halt_detection_enabled) {
vcpu_halted = 1;
CPU_SET_ATOMIC(vcpuid, &vm->halted_cpus);
}