[PATCHv11 06/19] x86/kexec: Keep CR4.MCE set during kexec for TDX guest

[Nikolay Borisov]

On 28.05.24 г. 12:55 ч., Kirill A. Shutemov wrote:
> 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 it.
> 
> Therefore, make sure the CR4.MCE setting is preserved over kexec too and
> avoid raising any #VEs.
> 
> The change doesn't affect non-TDX-guest environments.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov at linux.intel.com>

Reviewed-by: Nikolay Borisov <nik.borisov at suse.com>