From: Peter Gonda pgonda@google.com
[ Upstream commit a8f7e08a81708920a928664a865208fdf451c49f ]
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: 25189d08e5168 ("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 --- arch/x86/kernel/sev-es-shared.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/sev-es-shared.c b/arch/x86/kernel/sev-es-shared.c index 7d04b356d44d3..cdc04d0912423 100644 --- a/arch/x86/kernel/sev-es-shared.c +++ b/arch/x86/kernel/sev-es-shared.c @@ -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 */