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x86/reboot: Expose VMCS crash hooks if and only if KVM_{INTEL,AMD} is enabled

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Expose the crash/reboot hooks used by KVM to disable virtualization in
hardware and unblock INIT only if there's a potential in-tree user,
i.e. either KVM_INTEL or KVM_AMD is enabled.

Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20230721201859.2307736-9-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2023-07-21 13:18:48 -07:00
parent 59765db5fc
commit 261cd5ed93
2 changed files with 8 additions and 1 deletions
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4
arch/x86/include/asm/reboot.h
View File

@ -25,10 +25,14 @@ void __noreturn machine_real_restart(unsigned int type);
#define MRR_BIOS 0
#define MRR_APM 1
#if IS_ENABLED(CONFIG_KVM_INTEL) || IS_ENABLED(CONFIG_KVM_AMD)
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);
#else
static inline void cpu_emergency_disable_virtualization(void) {}
#endif /* CONFIG_KVM_INTEL || CONFIG_KVM_AMD */
typedef void (*nmi_shootdown_cb)(int, struct pt_regs*);
void nmi_shootdown_cpus(nmi_shootdown_cb callback);

5
arch/x86/kernel/reboot.c
View File

@ -529,6 +529,7 @@ static inline void kb_wait(void)
static inline void nmi_shootdown_cpus_on_restart(void);
#if IS_ENABLED(CONFIG_KVM_INTEL) || IS_ENABLED(CONFIG_KVM_AMD)
/* RCU-protected callback to disable virtualization prior to reboot. */
static cpu_emergency_virt_cb __rcu *cpu_emergency_virt_callback;
@ -596,7 +597,9 @@ static void emergency_reboot_disable_virtualization(void)
nmi_shootdown_cpus_on_restart();
}
}
#else
static void emergency_reboot_disable_virtualization(void) { }
#endif /* CONFIG_KVM_INTEL || CONFIG_KVM_AMD */
void __attribute__((weak)) mach_reboot_fixups(void)
{