diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-09-17 10:41:26 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-09-17 10:41:26 +0300 |
| commit | 2cdd5cc7032636d5f17822c6ba30ac08bfd2cb6d (patch) | |
| tree | 3ace6419f1564ed668781425877a24e9080406f6 /arch/x86/kernel/kvm.c | |
| parent | d2817063697747a8c9dcb971b2eb8f07fc153e5a (diff) | |
| parent | 1328edca4a142ee3c7442d1eece2c3ca383eff35 (diff) | |
| download | linux-2cdd5cc7032636d5f17822c6ba30ac08bfd2cb6d.tar.xz | |
Merge branch 'pm-cpuidle'
* pm-cpuidle:
cpuidle-haltpoll: Enable kvm guest polling when dedicated physical CPUs are available
cpuidle-haltpoll: do not set an owner to allow modunload
cpuidle-haltpoll: return -ENODEV on modinit failure
cpuidle-haltpoll: set haltpoll as preferred governor
cpuidle: allow governor switch on cpuidle_register_driver()
powercap: idle_inject: Use higher resolution for idle injection
cpuidle: play_idle: Increase the resolution to usec
cpuidle-haltpoll: vcpu hotplug support
cpuidle: teo: Get rid of redundant check in teo_update()
cpuidle: teo: Allow tick to be stopped if PM QoS is used
cpuidle: menu: Allow tick to be stopped if PM QoS is used
cpuidle: header file stubs must be "static inline"
cpuidle-haltpoll: disable host side polling when kvm virtualized
cpuidle: add haltpoll governor
governors: unify last_state_idx
cpuidle: add poll_limit_ns to cpuidle_device structure
add cpuidle-haltpoll driver
Diffstat (limited to 'arch/x86/kernel/kvm.c')
| -rw-r--r-- | arch/x86/kernel/kvm.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 4ab377c9fffe..98dafc1ea33d 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -705,6 +705,7 @@ unsigned int kvm_arch_para_hints(void) { return cpuid_edx(kvm_cpuid_base() | KVM_CPUID_FEATURES); } +EXPORT_SYMBOL_GPL(kvm_arch_para_hints); static uint32_t __init kvm_detect(void) { @@ -867,3 +868,39 @@ void __init kvm_spinlock_init(void) } #endif /* CONFIG_PARAVIRT_SPINLOCKS */ + +#ifdef CONFIG_ARCH_CPUIDLE_HALTPOLL + +static void kvm_disable_host_haltpoll(void *i) +{ + wrmsrl(MSR_KVM_POLL_CONTROL, 0); +} + +static void kvm_enable_host_haltpoll(void *i) +{ + wrmsrl(MSR_KVM_POLL_CONTROL, 1); +} + +void arch_haltpoll_enable(unsigned int cpu) +{ + if (!kvm_para_has_feature(KVM_FEATURE_POLL_CONTROL)) { + pr_err_once("kvm: host does not support poll control\n"); + pr_err_once("kvm: host upgrade recommended\n"); + return; + } + + /* Enable guest halt poll disables host halt poll */ + smp_call_function_single(cpu, kvm_disable_host_haltpoll, NULL, 1); +} +EXPORT_SYMBOL_GPL(arch_haltpoll_enable); + +void arch_haltpoll_disable(unsigned int cpu) +{ + if (!kvm_para_has_feature(KVM_FEATURE_POLL_CONTROL)) + return; + + /* Enable guest halt poll disables host halt poll */ + smp_call_function_single(cpu, kvm_enable_host_haltpoll, NULL, 1); +} +EXPORT_SYMBOL_GPL(arch_haltpoll_disable); +#endif |