[tip: x86/core] x86/boot/compressed/sev-es: Convert to insn_decode()

["tip-bot2 for Borislav Petkov" <tip-bot2@linutronix.de>]

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     514ef77607b9ff184c11b88e8f100bc27f07460d
Gitweb:        https://git.kernel.org/tip/514ef77607b9ff184c11b88e8f100bc27f07460d
Author:        Borislav Petkov <bp@suse.de>
AuthorDate:    Thu, 05 Nov 2020 17:53:20 +01:00
Committer:     Borislav Petkov <bp@suse.de>
CommitterDate: Mon, 15 Mar 2021 11:18:35 +01:00

x86/boot/compressed/sev-es: Convert to insn_decode()

Other than simplifying the code there should be no functional changes
resulting from this.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210304174237.31945-7-bp@alien8.de
---
 arch/x86/boot/compressed/sev-es.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/x86/boot/compressed/sev-es.c b/arch/x86/boot/compressed/sev-es.c
index 27826c2..801c626 100644
--- a/arch/x86/boot/compressed/sev-es.c
+++ b/arch/x86/boot/compressed/sev-es.c
@@ -78,16 +78,15 @@ static inline void sev_es_wr_ghcb_msr(u64 val)
 static enum es_result vc_decode_insn(struct es_em_ctxt *ctxt)
 {
 	char buffer[MAX_INSN_SIZE];
-	enum es_result ret;
+	int ret;
 
 	memcpy(buffer, (unsigned char *)ctxt->regs->ip, MAX_INSN_SIZE);
 
-	insn_init(&ctxt->insn, buffer, MAX_INSN_SIZE, 1);
-	insn_get_length(&ctxt->insn);
+	ret = insn_decode(&ctxt->insn, buffer, MAX_INSN_SIZE, INSN_MODE_64);
+	if (ret < 0)
+		return ES_DECODE_FAILED;
 
-	ret = ctxt->insn.immediate.got ? ES_OK : ES_DECODE_FAILED;
-
-	return ret;
+	return ES_OK;
 }
 
 static enum es_result vc_write_mem(struct es_em_ctxt *ctxt,