diff options
| author | Isaku Yamahata <isaku.yamahata@intel.com> | 2022-12-01 00:09:29 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-12-29 21:48:34 +0100 |
| commit | 667a83bf6a30b5660d02712dce9fb07e99abde38 (patch) | |
| tree | 7f213e7d16f3983acda38553a0192155c9fce731 /virt | |
| parent | KVM: Drop kvm_count_lock and instead protect kvm_usage_count with kvm_lock (diff) | |
| download | linux-667a83bf6a30b5660d02712dce9fb07e99abde38.tar.xz linux-667a83bf6a30b5660d02712dce9fb07e99abde38.zip | |
KVM: Remove on_each_cpu(hardware_disable_nolock) in kvm_exit()
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>
Message-Id: <20221130230934.1014142-46-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index f6caee790dc8..d1ed34856412 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -6050,7 +6050,6 @@ 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); } |