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

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
zero-sugar-mainline-defconfig
Peter Gonda 2021-01-05 08:33:11 -08:00 committed by Borislav Petkov
parent d1c5246e08
commit a8f7e08a81
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kernel/sev-es-shared.c
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@ -305,14 +305,14 @@ static enum es_result vc_ioio_exitinfo(struct es_em_ctxt *ctxt, u64 *exitinfo)
case 0xe4:
case 0xe5:
*exitinfo |= IOIO_TYPE_IN;
*exitinfo |= (u64)insn->immediate.value << 16;
*exitinfo |= (u8)insn->immediate.value << 16;
break;
/* OUT immediate opcodes */
case 0xe6:
case 0xe7:
*exitinfo |= IOIO_TYPE_OUT;
*exitinfo |= (u64)insn->immediate.value << 16;
*exitinfo |= (u8)insn->immediate.value << 16;
break;
/* IN register opcodes */