x86/kexec: Keep CR4.MCE set during kexec for TDX guest

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TDX guests run with MCA enabled (CR4.MCE=1b) from the very start. If
that bit is cleared during CR4 register reprogramming during boot or kexec
flows, a #VE exception will be raised which the guest kernel cannot handle.

Therefore, make sure the CR4.MCE setting is preserved over kexec too and avoid
raising any #VEs.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240614095904.1345461-7-kirill.shutemov@linux.intel.com

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Kirill A. Shutemov 2024-06-14 12:58:51 +03:00 • committed by Borislav Petkov (AMD)

parent 7b46a8997d

commit de60613173

1 changed files with 10 additions and 7 deletions

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arch/x86/kernel/relocate_kernel_64.S

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