On 5/6/14, 12:19 AM, Neel Natu wrote:
Author: neel
Date: Mon May 5 16:19:24 2014
New Revision: 265364
URL: http://svnweb.freebsd.org/changeset/base/265364
Log:
Virtual machine halt detection is turned on by default. Allow it to be
disabled via the tunable 'hw.vmm.halt_detection'.
So this can only be changed at boot time for the host? not even as a
sysctl?
Why is that?
Why can this not be done from the App?
Modified:
head/sys/amd64/vmm/vmm.c
Modified: head/sys/amd64/vmm/vmm.c
==============================================================================
--- head/sys/amd64/vmm/vmm.c Mon May 5 15:59:31 2014 (r265363)
+++ head/sys/amd64/vmm/vmm.c Mon May 5 16:19:24 2014 (r265364)
@@ -189,6 +189,16 @@ static VMM_STAT(VCPU_TOTAL_RUNTIME, "vcp
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,
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);
}
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