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x86/sev: Split up runtime #VC handler for correct state tracking

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Split up the #VC handler code into a from-user and a from-kernel part.
This allows clean and correct state tracking, as the #VC handler needs
to enter NMI-state when raised from kernel mode and plain IRQ state when
raised from user-mode.

Fixes: 62441a1fb5 ("x86/sev-es: Correctly track IRQ states in runtime #VC handler")
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210618115409.22735-3-joro@8bytes.org
This commit is contained in:
Joerg Roedel
2021-06-18 13:54:09 +02:00
committed by Borislav Petkov
parent d187f21733
commit be1a540886
3 changed files with 92 additions and 91 deletions
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4
arch/x86/entry/entry_64.S
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@@ -506,7 +506,7 @@ SYM_CODE_START(\asmsym)
movq %rsp, %rdi /* pt_regs pointer */
call \cfunc
call kernel_\cfunc
/*
* No need to switch back to the IST stack. The current stack is either
@@ -517,7 +517,7 @@ SYM_CODE_START(\asmsym)
/* Switch to the regular task stack */
.Lfrom_usermode_switch_stack_\@:
idtentry_body safe_stack_\cfunc, has_error_code=1
idtentry_body user_\cfunc, has_error_code=1
_ASM_NOKPROBE(\asmsym)
SYM_CODE_END(\asmsym)