[PATCH 07/17] Perform hardware_enable in CPU_STARTING callback

From: Zachary Amsden
Date: Tue Jun 15 2010 - 03:34:47 EST

The CPU_STARTING callback was added upstream with the intention
of being used for KVM, specifically for the hardware enablement
that must be done before we can run in hardware virt. It had
bugs on the x86_64 architecture at the time, where it was called
after CPU_ONLINE. The arches have since merged and the bug is

It might be noted other features should probably start making
use of this callback; microcode updates in particular which
might be fixing important erratums would be best applied before
beginning to run user tasks.

Signed-off-by: Zachary Amsden <zamsden@xxxxxxxxxx>
virt/kvm/kvm_main.c | 5 ++---
1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 84a0906..01a8876 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1957,10 +1957,10 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
- case CPU_ONLINE:
printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
- smp_call_function_single(cpu, hardware_enable, NULL, 1);
+ hardware_enable(NULL);
return NOTIFY_OK;
@@ -2095,7 +2095,6 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,

static struct notifier_block kvm_cpu_notifier = {
.notifier_call = kvm_cpu_hotplug,
- .priority = 20, /* must be > scheduler priority */

static int vm_stat_get(void *_offset, u64 *val)

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