x86/reboot: Assert that IRQs are disabled when turning off virtualization

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Assert that IRQs are disabled when turning off virtualization in an
emergency.  KVM enables hardware via on_each_cpu(), i.e. could re-enable
hardware if a pending IPI were delivered after disabling virtualization.

Remove a misleading comment from emergency_reboot_disable_virtualization()
about "just" needing to guarantee the CPU is stable (see above).

Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20230721201859.2307736-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Sean Christopherson 2023-07-21 13:18:45 -07:00

parent baeb4de7ad

commit ad93c1a7c0

1 changed files with 7 additions and 1 deletions

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arch/x86/kernel/reboot.c

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