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[40/44] KVM: Remove on_each_cpu(hardware_disable_nolock) in kvm_exit()

Message ID 20221102231911.3107438-41-seanjc@google.com (mailing list archive)
State Superseded
Headers show
Series KVM: Rework kvm_init() and hardware enabling | expand

Commit Message

Sean Christopherson Nov. 2, 2022, 11:19 p.m. UTC 
From: Isaku Yamahata <isaku.yamahata@intel.com>

Drop the superfluous invocation of hardware_disable_nolock() during
kvm_exit(), as it's nothing more than a glorified nop.

KVM automatically disables hardware on all CPUs when the last VM is
destroyed, and kvm_exit() cannot be called until the last VM goes
away as the calling module is pinned by an elevated refcount of the fops
associated with /dev/kvm.  This holds true even on x86, where the caller
of kvm_exit() is not kvm.ko, but is instead a dependent module, kvm_amd.ko
or kvm_intel.ko, as kvm_chardev_ops.owner is set to the module that calls
kvm_init(), not hardcoded to the base kvm.ko module.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
[sean: rework changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 virt/kvm/kvm_main.c | 1 -
 1 file changed, 1 deletion(-)
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Patch

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index c8d92e6c3922..4a42b78bfb0e 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -5966,7 +5966,6 @@  void kvm_exit(void)
 	unregister_syscore_ops(&kvm_syscore_ops);
 	unregister_reboot_notifier(&kvm_reboot_notifier);
 	cpuhp_remove_state_nocalls(CPUHP_AP_KVM_ONLINE);
-	on_each_cpu(hardware_disable_nolock, NULL, 1);
 	kvm_irqfd_exit();
 	free_cpumask_var(cpus_hardware_enabled);
 }