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| author | James Morse <james.morse@arm.com> | 2018-01-22 21:19:06 +0300 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2018-01-23 18:47:15 +0300 |
| commit | 58d6b15e9da5042a99c9c30ad725792e4569150e (patch) | |
| tree | 5e0a549e3ff64df8755410832d3737a27aac2697 /virt | |
| parent | 0482b50546b12e82346903500af081ed329f915c (diff) | |
| download | linux-58d6b15e9da5042a99c9c30ad725792e4569150e.tar.xz | |
KVM: arm/arm64: Handle CPU_PM_ENTER_FAILED
cpu_pm_enter() calls the pm notifier chain with CPU_PM_ENTER, then if
there is a failure: CPU_PM_ENTER_FAILED.
When KVM receives CPU_PM_ENTER it calls cpu_hyp_reset() which will
return us to the hyp-stub. If we subsequently get a CPU_PM_ENTER_FAILED,
KVM does nothing, leaving the CPU running with the hyp-stub, at odds
with kvm_arm_hardware_enabled.
Add CPU_PM_ENTER_FAILED as a fallthrough for CPU_PM_EXIT, this reloads
KVM based on kvm_arm_hardware_enabled. This is safe even if CPU_PM_ENTER
never gets as far as KVM, as cpu_hyp_reinit() calls cpu_hyp_reset()
to make sure the hyp-stub is loaded before reloading KVM.
Fixes: 67f691976662 ("arm64: kvm: allows kvm cpu hotplug")
Cc: <stable@vger.kernel.org> # v4.7+
CC: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/arm.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index 59d8e04c19fa..639dca0c0560 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -1262,6 +1262,7 @@ static int hyp_init_cpu_pm_notifier(struct notifier_block *self, cpu_hyp_reset(); return NOTIFY_OK; + case CPU_PM_ENTER_FAILED: case CPU_PM_EXIT: if (__this_cpu_read(kvm_arm_hardware_enabled)) /* The hardware was enabled before suspend. */ |