[tip: x86/asm] x86/insn: Avoid namespace clash by separating instruction decoder MMIO type from MMIO trace type

From: tip-bot2 for Jason A. Donenfeld
Date: Tue Jan 03 2023 - 06:00:44 EST

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

Commit-ID: a0e3aa8fe6cb1065686d5863bfeb7f5f3b17d030
Gitweb: https://git.kernel.org/tip/a0e3aa8fe6cb1065686d5863bfeb7f5f3b17d030
Author: Jason A. Donenfeld <Jason@xxxxxxxxx>
AuthorDate: Sun, 01 Jan 2023 17:29:04 +01:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Tue, 03 Jan 2023 11:30:28 +01:00

x86/insn: Avoid namespace clash by separating instruction decoder MMIO type from MMIO trace type

Both <linux/mmiotrace.h> and <asm/insn-eval.h> define various MMIO_ enum constants,
whose namespace overlaps.

Rename the <asm/insn-eval.h> ones to have a INSN_ prefix, so that the headers can be
used from the same source file.

Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230101162910.710293-2-Jason@xxxxxxxxx
---
arch/x86/coco/tdx/tdx.c | 26 +++++++++++++-------------
arch/x86/include/asm/insn-eval.h | 18 +++++++++---------
arch/x86/kernel/sev.c | 18 +++++++++---------
arch/x86/lib/insn-eval.c | 20 ++++++++++----------
4 files changed, 41 insertions(+), 41 deletions(-)

diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index cfd4c95..669d9e4 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -386,8 +386,8 @@ static int handle_mmio(struct pt_regs *regs, struct ve_info *ve)
{
unsigned long *reg, val, vaddr;
char buffer[MAX_INSN_SIZE];
+ enum insn_mmio_type mmio;
struct insn insn = {};
- enum mmio_type mmio;
int size, extend_size;
u8 extend_val = 0;

@@ -402,10 +402,10 @@ static int handle_mmio(struct pt_regs *regs, struct ve_info *ve)
return -EINVAL;

mmio = insn_decode_mmio(&insn, &size);
- if (WARN_ON_ONCE(mmio == MMIO_DECODE_FAILED))
+ if (WARN_ON_ONCE(mmio == INSN_MMIO_DECODE_FAILED))
return -EINVAL;

- if (mmio != MMIO_WRITE_IMM && mmio != MMIO_MOVS) {
+ if (mmio != INSN_MMIO_WRITE_IMM && mmio != INSN_MMIO_MOVS) {
reg = insn_get_modrm_reg_ptr(&insn, regs);
if (!reg)
return -EINVAL;
@@ -426,23 +426,23 @@ static int handle_mmio(struct pt_regs *regs, struct ve_info *ve)

/* Handle writes first */
switch (mmio) {
- case MMIO_WRITE:
+ case INSN_MMIO_WRITE:
memcpy(&val, reg, size);
if (!mmio_write(size, ve->gpa, val))
return -EIO;
return insn.length;
- case MMIO_WRITE_IMM:
+ case INSN_MMIO_WRITE_IMM:
val = insn.immediate.value;
if (!mmio_write(size, ve->gpa, val))
return -EIO;
return insn.length;
- case MMIO_READ:
- case MMIO_READ_ZERO_EXTEND:
- case MMIO_READ_SIGN_EXTEND:
+ case INSN_MMIO_READ:
+ case INSN_MMIO_READ_ZERO_EXTEND:
+ case INSN_MMIO_READ_SIGN_EXTEND:
/* Reads are handled below */
break;
- case MMIO_MOVS:
- case MMIO_DECODE_FAILED:
+ case INSN_MMIO_MOVS:
+ case INSN_MMIO_DECODE_FAILED:
/*
* MMIO was accessed with an instruction that could not be
* decoded or handled properly. It was likely not using io.h
@@ -459,15 +459,15 @@ static int handle_mmio(struct pt_regs *regs, struct ve_info *ve)
return -EIO;

switch (mmio) {
- case MMIO_READ:
+ case INSN_MMIO_READ:
/* Zero-extend for 32-bit operation */
extend_size = size == 4 ? sizeof(*reg) : 0;
break;
- case MMIO_READ_ZERO_EXTEND:
+ case INSN_MMIO_READ_ZERO_EXTEND:
/* Zero extend based on operand size */
extend_size = insn.opnd_bytes;
break;
- case MMIO_READ_SIGN_EXTEND:
+ case INSN_MMIO_READ_SIGN_EXTEND:
/* Sign extend based on operand size */
extend_size = insn.opnd_bytes;
if (size == 1 && val & BIT(7))
diff --git a/arch/x86/include/asm/insn-eval.h b/arch/x86/include/asm/insn-eval.h
index f07faa6..54368a4 100644
--- a/arch/x86/include/asm/insn-eval.h
+++ b/arch/x86/include/asm/insn-eval.h
@@ -32,16 +32,16 @@ int insn_fetch_from_user_inatomic(struct pt_regs *regs,
bool insn_decode_from_regs(struct insn *insn, struct pt_regs *regs,
unsigned char buf[MAX_INSN_SIZE], int buf_size);

-enum mmio_type {
- MMIO_DECODE_FAILED,
- MMIO_WRITE,
- MMIO_WRITE_IMM,
- MMIO_READ,
- MMIO_READ_ZERO_EXTEND,
- MMIO_READ_SIGN_EXTEND,
- MMIO_MOVS,
+enum insn_mmio_type {
+ INSN_MMIO_DECODE_FAILED,
+ INSN_MMIO_WRITE,
+ INSN_MMIO_WRITE_IMM,
+ INSN_MMIO_READ,
+ INSN_MMIO_READ_ZERO_EXTEND,
+ INSN_MMIO_READ_SIGN_EXTEND,
+ INSN_MMIO_MOVS,
};

-enum mmio_type insn_decode_mmio(struct insn *insn, int *bytes);
+enum insn_mmio_type insn_decode_mmio(struct insn *insn, int *bytes);

#endif /* _ASM_X86_INSN_EVAL_H */
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index a428c62..679026a 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -1536,32 +1536,32 @@ static enum es_result vc_handle_mmio_movs(struct es_em_ctxt *ctxt,
static enum es_result vc_handle_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
{
struct insn *insn = &ctxt->insn;
+ enum insn_mmio_type mmio;
unsigned int bytes = 0;
- enum mmio_type mmio;
enum es_result ret;
u8 sign_byte;
long *reg_data;

mmio = insn_decode_mmio(insn, &bytes);
- if (mmio == MMIO_DECODE_FAILED)
+ if (mmio == INSN_MMIO_DECODE_FAILED)
return ES_DECODE_FAILED;

- if (mmio != MMIO_WRITE_IMM && mmio != MMIO_MOVS) {
+ if (mmio != INSN_MMIO_WRITE_IMM && mmio != INSN_MMIO_MOVS) {
reg_data = insn_get_modrm_reg_ptr(insn, ctxt->regs);
if (!reg_data)
return ES_DECODE_FAILED;
}

switch (mmio) {
- case MMIO_WRITE:
+ case INSN_MMIO_WRITE:
memcpy(ghcb->shared_buffer, reg_data, bytes);
ret = vc_do_mmio(ghcb, ctxt, bytes, false);
break;
- case MMIO_WRITE_IMM:
+ case INSN_MMIO_WRITE_IMM:
memcpy(ghcb->shared_buffer, insn->immediate1.bytes, bytes);
ret = vc_do_mmio(ghcb, ctxt, bytes, false);
break;
- case MMIO_READ:
+ case INSN_MMIO_READ:
ret = vc_do_mmio(ghcb, ctxt, bytes, true);
if (ret)
break;
@@ -1572,7 +1572,7 @@ static enum es_result vc_handle_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)

memcpy(reg_data, ghcb->shared_buffer, bytes);
break;
- case MMIO_READ_ZERO_EXTEND:
+ case INSN_MMIO_READ_ZERO_EXTEND:
ret = vc_do_mmio(ghcb, ctxt, bytes, true);
if (ret)
break;
@@ -1581,7 +1581,7 @@ static enum es_result vc_handle_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
memset(reg_data, 0, insn->opnd_bytes);
memcpy(reg_data, ghcb->shared_buffer, bytes);
break;
- case MMIO_READ_SIGN_EXTEND:
+ case INSN_MMIO_READ_SIGN_EXTEND:
ret = vc_do_mmio(ghcb, ctxt, bytes, true);
if (ret)
break;
@@ -1600,7 +1600,7 @@ static enum es_result vc_handle_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
memset(reg_data, sign_byte, insn->opnd_bytes);
memcpy(reg_data, ghcb->shared_buffer, bytes);
break;
- case MMIO_MOVS:
+ case INSN_MMIO_MOVS:
ret = vc_handle_mmio_movs(ctxt, bytes);
break;
default:
diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c
index 21104c4..558a605 100644
--- a/arch/x86/lib/insn-eval.c
+++ b/arch/x86/lib/insn-eval.c
@@ -1595,16 +1595,16 @@ bool insn_decode_from_regs(struct insn *insn, struct pt_regs *regs,
* Returns:
*
* Type of the instruction. Size of the memory operand is stored in
- * @bytes. If decode failed, MMIO_DECODE_FAILED returned.
+ * @bytes. If decode failed, INSN_MMIO_DECODE_FAILED returned.
*/
-enum mmio_type insn_decode_mmio(struct insn *insn, int *bytes)
+enum insn_mmio_type insn_decode_mmio(struct insn *insn, int *bytes)
{
- enum mmio_type type = MMIO_DECODE_FAILED;
+ enum insn_mmio_type type = INSN_MMIO_DECODE_FAILED;

*bytes = 0;

if (insn_get_opcode(insn))
- return MMIO_DECODE_FAILED;
+ return INSN_MMIO_DECODE_FAILED;

switch (insn->opcode.bytes[0]) {
case 0x88: /* MOV m8,r8 */
@@ -1613,7 +1613,7 @@ enum mmio_type insn_decode_mmio(struct insn *insn, int *bytes)
case 0x89: /* MOV m16/m32/m64, r16/m32/m64 */
if (!*bytes)
*bytes = insn->opnd_bytes;
- type = MMIO_WRITE;
+ type = INSN_MMIO_WRITE;
break;

case 0xc6: /* MOV m8, imm8 */
@@ -1622,7 +1622,7 @@ enum mmio_type insn_decode_mmio(struct insn *insn, int *bytes)
case 0xc7: /* MOV m16/m32/m64, imm16/imm32/imm64 */
if (!*bytes)
*bytes = insn->opnd_bytes;
- type = MMIO_WRITE_IMM;
+ type = INSN_MMIO_WRITE_IMM;
break;

case 0x8a: /* MOV r8, m8 */
@@ -1631,7 +1631,7 @@ enum mmio_type insn_decode_mmio(struct insn *insn, int *bytes)
case 0x8b: /* MOV r16/r32/r64, m16/m32/m64 */
if (!*bytes)
*bytes = insn->opnd_bytes;
- type = MMIO_READ;
+ type = INSN_MMIO_READ;
break;

case 0xa4: /* MOVS m8, m8 */
@@ -1640,7 +1640,7 @@ enum mmio_type insn_decode_mmio(struct insn *insn, int *bytes)
case 0xa5: /* MOVS m16/m32/m64, m16/m32/m64 */
if (!*bytes)
*bytes = insn->opnd_bytes;
- type = MMIO_MOVS;
+ type = INSN_MMIO_MOVS;
break;

case 0x0f: /* Two-byte instruction */
@@ -1651,7 +1651,7 @@ enum mmio_type insn_decode_mmio(struct insn *insn, int *bytes)
case 0xb7: /* MOVZX r32/r64, m16 */
if (!*bytes)
*bytes = 2;
- type = MMIO_READ_ZERO_EXTEND;
+ type = INSN_MMIO_READ_ZERO_EXTEND;
break;

case 0xbe: /* MOVSX r16/r32/r64, m8 */
@@ -1660,7 +1660,7 @@ enum mmio_type insn_decode_mmio(struct insn *insn, int *bytes)
case 0xbf: /* MOVSX r32/r64, m16 */
if (!*bytes)
*bytes = 2;
- type = MMIO_READ_SIGN_EXTEND;
+ type = INSN_MMIO_READ_SIGN_EXTEND;
break;
}
break;

Next message: Ricardo Ribalda: "[PATCH v3 0/3] media: uvcvideo: Limit Power Line Control"
Previous message: Ard Biesheuvel: "Re: Linux 6.2-rc2"
In reply to: Jason A. Donenfeld: "Re: [PATCH v14 1/7] x86: lib: Separate instruction decoder MMIO type from MMIO trace"
Next in thread: tip-bot2 for Jason A. Donenfeld: "[tip: x86/urgent] x86/insn: Avoid namespace clash by separating instruction decoder MMIO type from MMIO trace type"
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