x86/sev: Make sure IRQs are disabled while GHCB is active

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The #VC handler only cares about IRQs being disabled while the GHCB is
active, as it must not be interrupted by something which could cause
another #VC while it holds the GHCB (NMI is the exception for which the
backup GHCB exits).

Make sure nothing interrupts the code path while the GHCB is active
by making sure that callers of __sev_{get,put}_ghcb() have disabled
interrupts upfront.

 [ bp: Massage commit message. ]

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/20210618115409.22735-2-joro@8bytes.org

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Joerg Roedel 2021-06-18 13:54:08 +02:00 • committed by Borislav Petkov

parent 07570cef5e

commit d187f21733

1 changed files with 22 additions and 12 deletions

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arch/x86/kernel/sev.c

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