x86/sev-es: Fix SEV-ES OUT/IN immediate opcode vc handling

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[ Upstream commit a8f7e08a81 ]

The IN and OUT instructions with port address as an immediate operand
only use an 8-bit immediate (imm8). The current VC handler uses the
entire 32-bit immediate value but these instructions only set the first
bytes.

Cast the operand to an u8 for that.

 [ bp: Massage commit message. ]

Fixes: 25189d08e5 ("x86/sev-es: Add support for handling IOIO exceptions")
Signed-off-by: Peter Gonda <pgonda@google.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: David Rientjes <rientjes@google.com>
Link: https://lkml.kernel.org/r/20210105163311.221490-1-pgonda@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Peter Gonda 2021-01-05 08:33:11 -08:00 • committed by Greg Kroah-Hartman

parent 1f63b3393b

commit e558b38b5e

1 changed files with 2 additions and 2 deletions

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arch/x86/kernel/sev-es-shared.c

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