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Moving the invocation of arch_cpu_finalize_init() earlier in the boot process caused a boot regression on IBT enabled system. The root cause is not the move of arch_cpu_finalize_init() itself. The system fails to boot because the subsequent efi_enter_virtual_mode() code has a non-IBT safe EFI call inside. This was never noticed because IBT was enabled after the EFI initialization. Switching the EFI call to use the IBT safe wrapper cures the problem. -----BEGIN PGP SIGNATURE----- iQJHBAABCgAxFiEEQp8+kY+LLUocC4bMphj1TA10mKEFAmSga0ITHHRnbHhAbGlu dXRyb25peC5kZQAKCRCmGPVMDXSYofPAEADCjJ40zgv7cbi6VTKudQhASwclWimy zJk1hR6u+Gt7slDAOS/lcHwPzwPB2wn9VsdTHClSHeJbdT3GBKMCOQOFaj1mHvOW e9H7PKUn76OLUSQtpquNiXvnkZGGK/FkTBCi1dEX3xhrWYQ9EVAg/9gDPLtCR5vv cS95KAETGq/7Krxdkgn/w1cav13t+WA25EjAochwG0DAiqVpj+QK1X+dvm8S9F4I MAyLboPK7cN7WijMVxruy1ho+n8L4ZHv6GcOnd9hD/Z6Tyk48hTvQOpVD7V3h1Yc GWzXVyOETuDAwBubfbxCFWQ2nbzwE6uCTGlwyaCmCxixxNSXhyiysvLOLgZr+tD9 97/Z2tZM+nWjnL8vXvpVCKTNJHTssgh2GvUiKzecRuJWK/FoyfbiZllztVPewmRx k9hwf1qMzW8/XpcpfuY9XkfOBIPDUqWpKBtl9XpprU3EFOjEFfkNmdhGPFHkKefG v0LL3dc19f5N8/tFJN5mEww1ZolgQ0aIKqvT0CeY0x0MvCTT214OWb59tzrn+dw3 tth+pGIZnh+5qM8geE1jQ162zkg+r0UaK4TClTqgwzrxIUHmBygI+LVnuPu2iYMi KlJSaOiU60NjzzVVujbSFclPIgkcINuVuQh5zyTGMBLtRgxPzARKTr8v9dqalHeH xcmDJsrKIpMy7A== =T/8G -----END PGP SIGNATURE----- Merge tag 'x86-urgent-2023-07-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 fix from Thomas Gleixner: "A single regression fix for x86: Moving the invocation of arch_cpu_finalize_init() earlier in the boot process caused a boot regression on IBT enabled system. The root cause is not the move of arch_cpu_finalize_init() itself. The system fails to boot because the subsequent efi_enter_virtual_mode() code has a non-IBT safe EFI call inside. This was not noticed before because IBT was enabled after the EFI initialization. Switching the EFI call to use the IBT safe wrapper cures the problem" * tag 'x86-urgent-2023-07-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/efi: Make efi_set_virtual_address_map IBT safe |
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