[PATCH 1/2] x86/kexec: Preserve CR4.MCE during kexec

Edgecombe, Rick P rick.p.edgecombe at intel.com
Wed Feb 15 17:49:39 PST 2023


On Tue, 2023-02-14 at 02:48 +0300, Kirill A. Shutemov wrote:
> TDX guests are not allowed to clear CR4.MCE. Attempt to clear it
> leads
> to #VE.
> 
> Preserve the flag during kexec.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov at linux.intel.com>

I wonder whats going on with the pre-existing switching between eax and
rax in this code for the cr0 and cr4 manipulations. Do you know what
the reason is?

Also, for a simple non-tdx kexec regression test:
Tested-by: Rick Edgecombe <rick.p.edgecombe at intel.com>


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