From: Peter Gonda Date: Tue, 5 Jan 2021 16:33:11 +0000 (-0800) Subject: x86/sev-es: Fix SEV-ES OUT/IN immediate opcode vc handling X-Git-Tag: accepted/tizen/unified/20230118.172025~8106^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a8f7e08a81708920a928664a865208fdf451c49f;p=platform%2Fkernel%2Flinux-rpi.git 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: 25189d08e5168 ("x86/sev-es: Add support for handling IOIO exceptions") Signed-off-by: Peter Gonda Signed-off-by: Borislav Petkov Acked-by: David Rientjes Link: https://lkml.kernel.org/r/20210105163311.221490-1-pgonda@google.com --- diff --git a/arch/x86/kernel/sev-es-shared.c b/arch/x86/kernel/sev-es-shared.c index 7d04b35..cdc04d0 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 */