linux-kernel - [RFC PATCH v0 11/19] x86/sev-es: Convert to insn

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Date:   Tue, 24 Nov 2020 11:19:44 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Lutomirski <luto@...capital.net>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH v0 11/19] x86/sev-es: Convert to insn_decode()

From: Borislav Petkov <bp@...e.de>

Simplify code, no functional changes.

Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/kernel/sev-es.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index 37736486603e..564cc9fc693d 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -244,8 +244,7 @@ static int vc_fetch_insn_kernel(struct es_em_ctxt *ctxt,
 static enum es_result vc_decode_insn(struct es_em_ctxt *ctxt)
 {
 	char buffer[MAX_INSN_SIZE];
-	enum es_result ret;
-	int res;
+	int res, ret;
 
 	if (user_mode(ctxt->regs)) {
 		res = insn_fetch_from_user(ctxt->regs, buffer);
@@ -267,13 +266,13 @@ static enum es_result vc_decode_insn(struct es_em_ctxt *ctxt)
 			return ES_EXCEPTION;
 		}
 
-		insn_init(&ctxt->insn, buffer, MAX_INSN_SIZE - res, 1);
-		insn_get_length(&ctxt->insn);
+		ret = insn_decode(&ctxt->insn, buffer, MAX_INSN_SIZE - res, INSN_MODE_64);
 	}
 
-	ret = ctxt->insn.immediate.got ? ES_OK : ES_DECODE_FAILED;
-
-	return ret;
+	if (ret < 0)
+		return ES_DECODE_FAILED;
+	else
+		return ES_OK;
 }
 
 static enum es_result vc_write_mem(struct es_em_ctxt *ctxt,
-- 
2.21.0