1375d9600c
[ Upstream commit b23c83ad2c638420ec0608a9de354507c41bec29 ] VMCLEAR active VMCSes before any emergency reboot, not just if the kernel may kexec into a new kernel after a crash. Per Intel's SDM, the VMX architecture doesn't require the CPU to flush the VMCS cache on INIT. If an emergency reboot doesn't RESET CPUs, cached VMCSes could theoretically be kept and only be written back to memory after the new kernel is booted, i.e. could effectively corrupt memory after reboot. Opportunistically remove the setting of the global pointer to NULL to make checkpatch happy. Cc: Andrew Cooper <Andrew.Cooper3@citrix.com> Link: https://lore.kernel.org/r/20230721201859.2307736-2-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
38 lines
1.0 KiB
C
38 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_REBOOT_H
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#define _ASM_X86_REBOOT_H
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#include <linux/kdebug.h>
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struct pt_regs;
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struct machine_ops {
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void (*restart)(char *cmd);
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void (*halt)(void);
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void (*power_off)(void);
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void (*shutdown)(void);
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void (*crash_shutdown)(struct pt_regs *);
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void (*emergency_restart)(void);
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};
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extern struct machine_ops machine_ops;
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extern int crashing_cpu;
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void native_machine_crash_shutdown(struct pt_regs *regs);
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void native_machine_shutdown(void);
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void __noreturn machine_real_restart(unsigned int type);
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/* These must match dispatch in arch/x86/realmore/rm/reboot.S */
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#define MRR_BIOS 0
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#define MRR_APM 1
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typedef void crash_vmclear_fn(void);
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extern crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss;
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void cpu_emergency_disable_virtualization(void);
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typedef void (*nmi_shootdown_cb)(int, struct pt_regs*);
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void nmi_panic_self_stop(struct pt_regs *regs);
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void nmi_shootdown_cpus(nmi_shootdown_cb callback);
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void run_crash_ipi_callback(struct pt_regs *regs);
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#endif /* _ASM_X86_REBOOT_H */
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