diff options
| author | Sean Christopherson <seanjc@google.com> | 2023-07-21 13:18:42 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-08-03 15:37:14 -0700 |
| commit | 5e408396c60cd0f0b53a43713016b6d6af8d69e0 (patch) | |
| tree | 903b6f3221c77e427ab92923d3a38cf70055f5dd /arch/x86/include/asm/reboot.h | |
| parent | b23c83ad2c638420ec0608a9de354507c41bec29 (diff) | |
x86/reboot: Harden virtualization hooks for emergency reboot
Provide dedicated helpers to (un)register virt hooks used during an
emergency crash/reboot, and WARN if there is an attempt to overwrite
the registered callback, or an attempt to do an unpaired unregister.
Opportunsitically use rcu_assign_pointer() instead of RCU_INIT_POINTER(),
mainly so that the set/unset paths are more symmetrical, but also because
any performance gains from using RCU_INIT_POINTER() are meaningless for
this code.
Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20230721201859.2307736-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/include/asm/reboot.h')
| -rw-r--r-- | arch/x86/include/asm/reboot.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/include/asm/reboot.h b/arch/x86/include/asm/reboot.h index dc201724a643..74c6a624d166 100644 --- a/arch/x86/include/asm/reboot.h +++ b/arch/x86/include/asm/reboot.h @@ -25,8 +25,9 @@ void __noreturn machine_real_restart(unsigned int type); #define MRR_BIOS 0 #define MRR_APM 1 -typedef void crash_vmclear_fn(void); -extern crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss; +typedef void (cpu_emergency_virt_cb)(void); +void cpu_emergency_register_virt_callback(cpu_emergency_virt_cb *callback); +void cpu_emergency_unregister_virt_callback(cpu_emergency_virt_cb *callback); void cpu_emergency_disable_virtualization(void); typedef void (*nmi_shootdown_cb)(int, struct pt_regs*); |