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cpuidle-haltpoll: disable host side polling when kvm virtualized

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When performing guest side polling, it is not necessary to
also perform host side polling.

So disable host side polling, via the new MSR interface,
when loading cpuidle-haltpoll driver.

Signed-off-by: Marcelo Tosatti <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Marcelo Tosatti 2019-07-03 20:51:29 -03:00 • committed by Rafael J. Wysocki
commit a1c4423b02
5 changed files with 81 additions and 1 deletions
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9
drivers/cpuidle/cpuidle-haltpoll.c
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@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/sched/idle.h>
#include <linux/kvm_para.h>
#include <linux/cpuidle_haltpoll.h>
static int default_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
@ -47,6 +48,7 @@ static struct cpuidle_driver haltpoll_driver = {
static int __init haltpoll_init(void)
{
int ret;
struct cpuidle_driver *drv = &haltpoll_driver;
cpuidle_poll_state_init(drv);
@ -54,11 +56,16 @@ static int __init haltpoll_init(void)
if (!kvm_para_available())
return 0;
return cpuidle_register(&haltpoll_driver, NULL);
ret = cpuidle_register(&haltpoll_driver, NULL);
if (ret == 0)
arch_haltpoll_enable();
return ret;
}
static void __exit haltpoll_exit(void)
{
arch_haltpoll_disable();
cpuidle_unregister(&haltpoll_driver);
}