x86/realmode: Add SEV-ES specific trampoline entry point

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The code at the trampoline entry point is executed in real-mode. In
real-mode, #VC exceptions can't be handled so anything that might cause
such an exception must be avoided.

In the standard trampoline entry code this is the WBINVD instruction and
the call to verify_cpu(), which are both not needed anyway when running
as an SEV-ES guest.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-66-joro@8bytes.org

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Joerg Roedel 2020-09-07 15:16:06 +02:00 • committed by Borislav Petkov

parent 1a222de8dc

commit bf5ff27644

3 changed files with 26 additions and 0 deletions

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3

arch/x86/include/asm/realmode.h

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3

arch/x86/realmode/rm/header.S

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20

arch/x86/realmode/rm/trampoline_64.S

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