[PATCH v2 01/21] x86/insn: Rename insn_decode() to insn_decode_from_regs()

From: Borislav Petkov
Date: Wed Feb 24 2021 - 06:05:46 EST


From: Borislav Petkov <bp@xxxxxxx>

Rename insn_decode() to insn_decode_from_regs() to denote that it
receives regs as param and uses registers from there during decoding.
Free the former name for a more generic version of the function.

No functional changes.

Signed-off-by: Borislav Petkov <bp@xxxxxxx>
---
arch/x86/include/asm/insn-eval.h | 4 ++--
arch/x86/kernel/sev-es.c | 2 +-
arch/x86/kernel/umip.c | 2 +-
arch/x86/lib/insn-eval.c | 6 +++---
4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/insn-eval.h b/arch/x86/include/asm/insn-eval.h
index a0f839aa144d..c755f1a2618b 100644
--- a/arch/x86/include/asm/insn-eval.h
+++ b/arch/x86/include/asm/insn-eval.h
@@ -23,7 +23,7 @@ unsigned long insn_get_seg_base(struct pt_regs *regs, int seg_reg_idx);
int insn_get_code_seg_params(struct pt_regs *regs);
int insn_fetch_from_user(struct pt_regs *regs,
unsigned char buf[MAX_INSN_SIZE]);
-bool insn_decode(struct insn *insn, struct pt_regs *regs,
- unsigned char buf[MAX_INSN_SIZE], int buf_size);
+bool insn_decode_from_regs(struct insn *insn, struct pt_regs *regs,
+ unsigned char buf[MAX_INSN_SIZE], int buf_size);

#endif /* _ASM_X86_INSN_EVAL_H */
diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index 84c1821819af..248d14ae5602 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -256,7 +256,7 @@ static enum es_result vc_decode_insn(struct es_em_ctxt *ctxt)
return ES_EXCEPTION;
}

- if (!insn_decode(&ctxt->insn, ctxt->regs, buffer, res))
+ if (!insn_decode_from_regs(&ctxt->insn, ctxt->regs, buffer, res))
return ES_DECODE_FAILED;
} else {
res = vc_fetch_insn_kernel(ctxt, buffer);
diff --git a/arch/x86/kernel/umip.c b/arch/x86/kernel/umip.c
index f6225bf22c02..8032f5f7eef9 100644
--- a/arch/x86/kernel/umip.c
+++ b/arch/x86/kernel/umip.c
@@ -356,7 +356,7 @@ bool fixup_umip_exception(struct pt_regs *regs)
if (!nr_copied)
return false;

- if (!insn_decode(&insn, regs, buf, nr_copied))
+ if (!insn_decode_from_regs(&insn, regs, buf, nr_copied))
return false;

umip_inst = identify_insn(&insn);
diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c
index 4229950a5d78..d0ebf9e93e35 100644
--- a/arch/x86/lib/insn-eval.c
+++ b/arch/x86/lib/insn-eval.c
@@ -1454,7 +1454,7 @@ int insn_fetch_from_user(struct pt_regs *regs, unsigned char buf[MAX_INSN_SIZE])
}

/**
- * insn_decode() - Decode an instruction
+ * insn_decode_from_regs() - Decode an instruction
* @insn: Structure to store decoded instruction
* @regs: Structure with register values as seen when entering kernel mode
* @buf: Buffer containing the instruction bytes
@@ -1467,8 +1467,8 @@ int insn_fetch_from_user(struct pt_regs *regs, unsigned char buf[MAX_INSN_SIZE])
*
* True if instruction was decoded, False otherwise.
*/
-bool insn_decode(struct insn *insn, struct pt_regs *regs,
- unsigned char buf[MAX_INSN_SIZE], int buf_size)
+bool insn_decode_from_regs(struct insn *insn, struct pt_regs *regs,
+ unsigned char buf[MAX_INSN_SIZE], int buf_size)
{
int seg_defs;

--
2.29.2