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x86/paravirt: Standardize 'insn_buff' variable names 

We currently have 6 (!) separate naming variants to name temporary instruction
buffers that are used for code patching:

 - insnbuf
 - insnbuff
 - insn_buff
 - insn_buffer
 - ibuf
 - ibuffer

These are used as local variables, percpu fields and function parameters.

Standardize all the names to a single variant: 'insn_buff'.

Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2019-04-25 13:03:31 +02:00
parent fc93dfd934
commit 1fc654cf6e
8 changed files with 93 additions and 96 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/x86/events/intel/ds.c
View File

@ -337,7 +337,7 @@ static int alloc_pebs_buffer(int cpu)
struct debug_store *ds = hwev->ds;
size_t bsiz = x86_pmu.pebs_buffer_size;
int max, node = cpu_to_node(cpu);
void *buffer, *ibuffer, *cea;
void *buffer, *insn_buff, *cea;
if (!x86_pmu.pebs)
return 0;
@ -351,12 +351,12 @@ static int alloc_pebs_buffer(int cpu)
* buffer then.
*/
if (x86_pmu.intel_cap.pebs_format < 2) {
ibuffer = kzalloc_node(PEBS_FIXUP_SIZE, GFP_KERNEL, node);
if (!ibuffer) {
insn_buff = kzalloc_node(PEBS_FIXUP_SIZE, GFP_KERNEL, node);
if (!insn_buff) {
dsfree_pages(buffer, bsiz);
return -ENOMEM;
}
per_cpu(insn_buffer, cpu) = ibuffer;
per_cpu(insn_buffer, cpu) = insn_buff;
}
hwev->ds_pebs_vaddr = buffer;
/* Update the cpu entry area mapping */

13
arch/x86/include/asm/paravirt_types.h
View File

@ -88,7 +88,7 @@ struct pv_init_ops {
* the number of bytes of code generated, as we nop pad the
* rest in generic code.
*/
unsigned (*patch)(u8 type, void *insnbuf,
unsigned (*patch)(u8 type, void *insn_buff,
unsigned long addr, unsigned len);
} __no_randomize_layout;
@ -370,14 +370,11 @@ extern struct paravirt_patch_template pv_ops;
/* Simple instruction patching code. */
#define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
unsigned paravirt_patch_default(u8 type, void *insnbuf,
unsigned long addr, unsigned len);
unsigned paravirt_patch_ident_64(void *insn_buff, unsigned len);
unsigned paravirt_patch_default(u8 type, void *insn_buff, unsigned long addr, unsigned len);
unsigned paravirt_patch_insns(void *insn_buff, unsigned len, const char *start, const char *end);
unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
const char *start, const char *end);
unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len);
unsigned native_patch(u8 type, void *insn_buff, unsigned long addr, unsigned len);
int paravirt_disable_iospace(void);

52
arch/x86/kernel/alternative.c
View File

@ -275,7 +275,7 @@ static inline bool is_jmp(const u8 opcode)
}
static void __init_or_module
recompute_jump(struct alt_instr *a, u8 *orig_insn, u8 *repl_insn, u8 *insnbuf)
recompute_jump(struct alt_instr *a, u8 *orig_insn, u8 *repl_insn, u8 *insn_buff)
{
u8 *next_rip, *tgt_rip;
s32 n_dspl, o_dspl;
@ -284,7 +284,7 @@ recompute_jump(struct alt_instr *a, u8 *orig_insn, u8 *repl_insn, u8 *insnbuf)
if (a->replacementlen != 5)
return;
o_dspl = *(s32 *)(insnbuf + 1);
o_dspl = *(s32 *)(insn_buff + 1);
/* next_rip of the replacement JMP */
next_rip = repl_insn + a->replacementlen;
@ -310,9 +310,9 @@ recompute_jump(struct alt_instr *a, u8 *orig_insn, u8 *repl_insn, u8 *insnbuf)
two_byte_jmp:
n_dspl -= 2;
insnbuf[0] = 0xeb;
insnbuf[1] = (s8)n_dspl;
add_nops(insnbuf + 2, 3);
insn_buff[0] = 0xeb;
insn_buff[1] = (s8)n_dspl;
add_nops(insn_buff + 2, 3);
repl_len = 2;
goto done;
@ -320,8 +320,8 @@ two_byte_jmp:
five_byte_jmp:
n_dspl -= 5;
insnbuf[0] = 0xe9;
*(s32 *)&insnbuf[1] = n_dspl;
insn_buff[0] = 0xe9;
*(s32 *)&insn_buff[1] = n_dspl;
repl_len = 5;
@ -368,7 +368,7 @@ void __init_or_module noinline apply_alternatives(struct alt_instr *start,
{
struct alt_instr *a;
u8 *instr, *replacement;
u8 insnbuf[MAX_PATCH_LEN];
u8 insn_buff[MAX_PATCH_LEN];
DPRINTK("alt table %px, -> %px", start, end);
/*
@ -381,11 +381,11 @@ void __init_or_module noinline apply_alternatives(struct alt_instr *start,
* order.
*/
for (a = start; a < end; a++) {
int insnbuf_sz = 0;
int insn_buff_sz = 0;
instr = (u8 *)&a->instr_offset + a->instr_offset;
replacement = (u8 *)&a->repl_offset + a->repl_offset;
BUG_ON(a->instrlen > sizeof(insnbuf));
BUG_ON(a->instrlen > sizeof(insn_buff));
BUG_ON(a->cpuid >= (NCAPINTS + NBUGINTS) * 32);
if (!boot_cpu_has(a->cpuid)) {
if (a->padlen > 1)
@ -403,8 +403,8 @@ void __init_or_module noinline apply_alternatives(struct alt_instr *start,
DUMP_BYTES(instr, a->instrlen, "%px: old_insn: ", instr);
DUMP_BYTES(replacement, a->replacementlen, "%px: rpl_insn: ", replacement);
memcpy(insnbuf, replacement, a->replacementlen);
insnbuf_sz = a->replacementlen;
memcpy(insn_buff, replacement, a->replacementlen);
insn_buff_sz = a->replacementlen;
/*
* 0xe8 is a relative jump; fix the offset.
@ -412,24 +412,24 @@ void __init_or_module noinline apply_alternatives(struct alt_instr *start,
* Instruction length is checked before the opcode to avoid
* accessing uninitialized bytes for zero-length replacements.
*/
if (a->replacementlen == 5 && *insnbuf == 0xe8) {
*(s32 *)(insnbuf + 1) += replacement - instr;
if (a->replacementlen == 5 && *insn_buff == 0xe8) {
*(s32 *)(insn_buff + 1) += replacement - instr;
DPRINTK("Fix CALL offset: 0x%x, CALL 0x%lx",
*(s32 *)(insnbuf + 1),
(unsigned long)instr + *(s32 *)(insnbuf + 1) + 5);
*(s32 *)(insn_buff + 1),
(unsigned long)instr + *(s32 *)(insn_buff + 1) + 5);
}
if (a->replacementlen && is_jmp(replacement[0]))
recompute_jump(a, instr, replacement, insnbuf);
recompute_jump(a, instr, replacement, insn_buff);
if (a->instrlen > a->replacementlen) {
add_nops(insnbuf + a->replacementlen,
add_nops(insn_buff + a->replacementlen,
a->instrlen - a->replacementlen);
insnbuf_sz += a->instrlen - a->replacementlen;
insn_buff_sz += a->instrlen - a->replacementlen;
}
DUMP_BYTES(insnbuf, insnbuf_sz, "%px: final_insn: ", instr);
DUMP_BYTES(insn_buff, insn_buff_sz, "%px: final_insn: ", instr);
text_poke_early(instr, insnbuf, insnbuf_sz);
text_poke_early(instr, insn_buff, insn_buff_sz);
}
}
@ -591,22 +591,22 @@ void __init_or_module apply_paravirt(struct paravirt_patch_site *start,
struct paravirt_patch_site *end)
{
struct paravirt_patch_site *p;
char insnbuf[MAX_PATCH_LEN];
char insn_buff[MAX_PATCH_LEN];
for (p = start; p < end; p++) {
unsigned int used;
BUG_ON(p->len > MAX_PATCH_LEN);
/* prep the buffer with the original instructions */
memcpy(insnbuf, p->instr, p->len);
used = pv_ops.init.patch(p->instrtype, insnbuf,
memcpy(insn_buff, p->instr, p->len);
used = pv_ops.init.patch(p->instrtype, insn_buff,
(unsigned long)p->instr, p->len);
BUG_ON(used > p->len);
/* Pad the rest with nops */
add_nops(insnbuf + used, p->len - used);
text_poke_early(p->instr, insnbuf, p->len);
add_nops(insn_buff + used, p->len - used);
text_poke_early(p->instr, insn_buff, p->len);
}
}
extern struct paravirt_patch_site __start_parainstructions[],

16
arch/x86/kernel/kprobes/opt.c
View File

@ -431,7 +431,7 @@ err:
void arch_optimize_kprobes(struct list_head *oplist)
{
struct optimized_kprobe *op, *tmp;
u8 insn_buf[RELATIVEJUMP_SIZE];
u8 insn_buff[RELATIVEJUMP_SIZE];
list_for_each_entry_safe(op, tmp, oplist, list) {
s32 rel = (s32)((long)op->optinsn.insn -
@ -443,10 +443,10 @@ void arch_optimize_kprobes(struct list_head *oplist)
memcpy(op->optinsn.copied_insn, op->kp.addr + INT3_SIZE,
RELATIVE_ADDR_SIZE);
insn_buf[0] = RELATIVEJUMP_OPCODE;
*(s32 *)(&insn_buf[1]) = rel;
insn_buff[0] = RELATIVEJUMP_OPCODE;
*(s32 *)(&insn_buff[1]) = rel;
text_poke_bp(op->kp.addr, insn_buf, RELATIVEJUMP_SIZE,
text_poke_bp(op->kp.addr, insn_buff, RELATIVEJUMP_SIZE,
op->optinsn.insn);
list_del_init(&op->list);
@ -456,12 +456,12 @@ void arch_optimize_kprobes(struct list_head *oplist)
/* Replace a relative jump with a breakpoint (int3). */
void arch_unoptimize_kprobe(struct optimized_kprobe *op)
{
u8 insn_buf[RELATIVEJUMP_SIZE];
u8 insn_buff[RELATIVEJUMP_SIZE];
/* Set int3 to first byte for kprobes */
insn_buf[0] = BREAKPOINT_INSTRUCTION;
memcpy(insn_buf + 1, op->optinsn.copied_insn, RELATIVE_ADDR_SIZE);
text_poke_bp(op->kp.addr, insn_buf, RELATIVEJUMP_SIZE,
insn_buff[0] = BREAKPOINT_INSTRUCTION;
memcpy(insn_buff + 1, op->optinsn.copied_insn, RELATIVE_ADDR_SIZE);
text_poke_bp(op->kp.addr, insn_buff, RELATIVEJUMP_SIZE,
op->optinsn.insn);
}

22
arch/x86/kernel/paravirt.c
View File

@ -70,11 +70,11 @@ struct branch {
u32 delta;
} __attribute__((packed));
static unsigned paravirt_patch_call(void *insnbuf, const void *target,
static unsigned paravirt_patch_call(void *insn_buff, const void *target,
unsigned long addr, unsigned len)
{
const int call_len = 5;
struct branch *b = insnbuf;
struct branch *b = insn_buff;
unsigned long delta = (unsigned long)target - (addr+call_len);
if (len < call_len) {
@ -97,10 +97,10 @@ u64 notrace _paravirt_ident_64(u64 x)
return x;
}
static unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
static unsigned paravirt_patch_jmp(void *insn_buff, const void *target,
unsigned long addr, unsigned len)
{
struct branch *b = insnbuf;
struct branch *b = insn_buff;
unsigned long delta = (unsigned long)target - (addr+5);
if (len < 5) {
@ -125,7 +125,7 @@ void __init native_pv_lock_init(void)
static_branch_disable(&virt_spin_lock_key);
}
unsigned paravirt_patch_default(u8 type, void *insnbuf,
unsigned paravirt_patch_default(u8 type, void *insn_buff,
unsigned long addr, unsigned len)
{
/*
@ -137,28 +137,28 @@ unsigned paravirt_patch_default(u8 type, void *insnbuf,
if (opfunc == NULL)
/* If there's no function, patch it with a ud2a (BUG) */
ret = paravirt_patch_insns(insnbuf, len, ud2a, ud2a+sizeof(ud2a));
ret = paravirt_patch_insns(insn_buff, len, ud2a, ud2a+sizeof(ud2a));
else if (opfunc == _paravirt_nop)
ret = 0;
#ifdef CONFIG_PARAVIRT_XXL
/* identity functions just return their single argument */
else if (opfunc == _paravirt_ident_64)
ret = paravirt_patch_ident_64(insnbuf, len);
ret = paravirt_patch_ident_64(insn_buff, len);
else if (type == PARAVIRT_PATCH(cpu.iret) ||
type == PARAVIRT_PATCH(cpu.usergs_sysret64))
/* If operation requires a jmp, then jmp */
ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
ret = paravirt_patch_jmp(insn_buff, opfunc, addr, len);
#endif
else
/* Otherwise call the function. */
ret = paravirt_patch_call(insnbuf, opfunc, addr, len);
ret = paravirt_patch_call(insn_buff, opfunc, addr, len);
return ret;
}
unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
unsigned paravirt_patch_insns(void *insn_buff, unsigned len,
const char *start, const char *end)
{
unsigned insn_len = end - start;
@ -166,7 +166,7 @@ unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
/* Alternative instruction is too large for the patch site and we cannot continue: */
BUG_ON(insn_len > len || start == NULL);
memcpy(insnbuf, start, insn_len);
memcpy(insn_buff, start, insn_len);
return insn_len;
}

42
arch/x86/kernel/paravirt_patch.c
View File

@ -10,12 +10,12 @@
#define PEND(d, m) \
(PSTART(d, m) + sizeof(patch_data_##d.m))
#define PATCH(d, m, ibuf, len) \
paravirt_patch_insns(ibuf, len, PSTART(d, m), PEND(d, m))
#define PATCH(d, m, insn_buff, len) \
paravirt_patch_insns(insn_buff, len, PSTART(d, m), PEND(d, m))
#define PATCH_CASE(ops, m, data, ibuf, len) \
#define PATCH_CASE(ops, m, data, insn_buff, len) \
case PARAVIRT_PATCH(ops.m): \
return PATCH(data, ops##_##m, ibuf, len)
return PATCH(data, ops##_##m, insn_buff, len)
#ifdef CONFIG_PARAVIRT_XXL
struct patch_xxl {
@ -57,10 +57,10 @@ static const struct patch_xxl patch_data_xxl = {
# endif
};
unsigned int paravirt_patch_ident_64(void *insnbuf, unsigned int len)
unsigned int paravirt_patch_ident_64(void *insn_buff, unsigned int len)
{
#ifdef CONFIG_X86_64
return PATCH(xxl, mov64, insnbuf, len);
return PATCH(xxl, mov64, insn_buff, len);
#endif
return 0;
}
@ -83,44 +83,44 @@ static const struct patch_lock patch_data_lock = {
};
#endif /* CONFIG_PARAVIRT_SPINLOCKS */
unsigned int native_patch(u8 type, void *ibuf, unsigned long addr,
unsigned int native_patch(u8 type, void *insn_buff, unsigned long addr,
unsigned int len)
{
switch (type) {
#ifdef CONFIG_PARAVIRT_XXL
PATCH_CASE(irq, restore_fl, xxl, ibuf, len);
PATCH_CASE(irq, save_fl, xxl, ibuf, len);
PATCH_CASE(irq, irq_enable, xxl, ibuf, len);
PATCH_CASE(irq, irq_disable, xxl, ibuf, len);
PATCH_CASE(irq, restore_fl, xxl, insn_buff, len);
PATCH_CASE(irq, save_fl, xxl, insn_buff, len);
PATCH_CASE(irq, irq_enable, xxl, insn_buff, len);
PATCH_CASE(irq, irq_disable, xxl, insn_buff, len);
PATCH_CASE(mmu, read_cr2, xxl, ibuf, len);
PATCH_CASE(mmu, read_cr3, xxl, ibuf, len);
PATCH_CASE(mmu, write_cr3, xxl, ibuf, len);
PATCH_CASE(mmu, read_cr2, xxl, insn_buff, len);
PATCH_CASE(mmu, read_cr3, xxl, insn_buff, len);
PATCH_CASE(mmu, write_cr3, xxl, insn_buff, len);
# ifdef CONFIG_X86_64
PATCH_CASE(cpu, usergs_sysret64, xxl, ibuf, len);
PATCH_CASE(cpu, swapgs, xxl, ibuf, len);
PATCH_CASE(cpu, wbinvd, xxl, ibuf, len);
PATCH_CASE(cpu, usergs_sysret64, xxl, insn_buff, len);
PATCH_CASE(cpu, swapgs, xxl, insn_buff, len);
PATCH_CASE(cpu, wbinvd, xxl, insn_buff, len);
# else
PATCH_CASE(cpu, iret, xxl, ibuf, len);
PATCH_CASE(cpu, iret, xxl, insn_buff, len);
# endif
#endif
#ifdef CONFIG_PARAVIRT_SPINLOCKS
case PARAVIRT_PATCH(lock.queued_spin_unlock):
if (pv_is_native_spin_unlock())
return PATCH(lock, queued_spin_unlock, ibuf, len);
return PATCH(lock, queued_spin_unlock, insn_buff, len);
break;
case PARAVIRT_PATCH(lock.vcpu_is_preempted):
if (pv_is_native_vcpu_is_preempted())
return PATCH(lock, vcpu_is_preempted, ibuf, len);
return PATCH(lock, vcpu_is_preempted, insn_buff, len);
break;
#endif
default:
break;
}
return paravirt_patch_default(type, ibuf, addr, len);
return paravirt_patch_default(type, insn_buff, addr, len);
}

8
arch/x86/tools/insn_decoder_test.c
View File

@ -119,7 +119,7 @@ static void parse_args(int argc, char **argv)
int main(int argc, char **argv)
{
char line[BUFSIZE], sym[BUFSIZE] = "<unknown>";
unsigned char insn_buf[16];
unsigned char insn_buff[16];
struct insn insn;
int insns = 0;
int warnings = 0;
@ -138,7 +138,7 @@ int main(int argc, char **argv)
}
insns++;
memset(insn_buf, 0, 16);
memset(insn_buff, 0, 16);
strcpy(copy, line);
tab1 = strchr(copy, '\t');
if (!tab1)
@ -151,13 +151,13 @@ int main(int argc, char **argv)
*tab2 = '\0'; /* Characters beyond tab2 aren't examined */
while (s < tab2) {
if (sscanf(s, "%x", &b) == 1) {
insn_buf[nb++] = (unsigned char) b;
insn_buff[nb++] = (unsigned char) b;
s += 3;
} else
break;
}
/* Decode an instruction */
insn_init(&insn, insn_buf, sizeof(insn_buf), x86_64);
insn_init(&insn, insn_buff, sizeof(insn_buff), x86_64);
insn_get_length(&insn);
if (insn.length != nb) {
warnings++;

28
arch/x86/tools/insn_sanity.c
View File

@ -96,7 +96,7 @@ static void dump_insn(FILE *fp, struct insn *insn)
}
static void dump_stream(FILE *fp, const char *msg, unsigned long nr_iter,
unsigned char *insn_buf, struct insn *insn)
unsigned char *insn_buff, struct insn *insn)
{
int i;
@ -109,7 +109,7 @@ static void dump_stream(FILE *fp, const char *msg, unsigned long nr_iter,
/* Input a decoded instruction sequence directly */
fprintf(fp, " $ echo ");
for (i = 0; i < MAX_INSN_SIZE; i++)
fprintf(fp, " %02x", insn_buf[i]);
fprintf(fp, " %02x", insn_buff[i]);
fprintf(fp, " | %s -i -\n", prog);
if (!input_file) {
@ -137,7 +137,7 @@ fail:
}
/* Read given instruction sequence from the input file */
static int read_next_insn(unsigned char *insn_buf)
static int read_next_insn(unsigned char *insn_buff)
{
char buf[256] = "", *tmp;
int i;
@ -147,7 +147,7 @@ static int read_next_insn(unsigned char *insn_buf)
return 0;
for (i = 0; i < MAX_INSN_SIZE; i++) {
insn_buf[i] = (unsigned char)strtoul(tmp, &tmp, 16);
insn_buff[i] = (unsigned char)strtoul(tmp, &tmp, 16);
if (*tmp != ' ')
break;
}
@ -155,19 +155,19 @@ static int read_next_insn(unsigned char *insn_buf)
return i;
}
static int generate_insn(unsigned char *insn_buf)
static int generate_insn(unsigned char *insn_buff)
{
int i;
if (input_file)
return read_next_insn(insn_buf);
return read_next_insn(insn_buff);
/* Fills buffer with random binary up to MAX_INSN_SIZE */
for (i = 0; i < MAX_INSN_SIZE - 1; i += 2)
*(unsigned short *)(&insn_buf[i]) = random() & 0xffff;
*(unsigned short *)(&insn_buff[i]) = random() & 0xffff;
while (i < MAX_INSN_SIZE)
insn_buf[i++] = random() & 0xff;
insn_buff[i++] = random() & 0xff;
return i;
}
@ -239,31 +239,31 @@ int main(int argc, char **argv)
int insns = 0;
int errors = 0;
unsigned long i;
unsigned char insn_buf[MAX_INSN_SIZE * 2];
unsigned char insn_buff[MAX_INSN_SIZE * 2];
parse_args(argc, argv);
/* Prepare stop bytes with NOPs */
memset(insn_buf + MAX_INSN_SIZE, INSN_NOP, MAX_INSN_SIZE);
memset(insn_buff + MAX_INSN_SIZE, INSN_NOP, MAX_INSN_SIZE);
for (i = 0; i < iter_end; i++) {
if (generate_insn(insn_buf) <= 0)
if (generate_insn(insn_buff) <= 0)
break;
if (i < iter_start) /* Skip to given iteration number */
continue;
/* Decode an instruction */
insn_init(&insn, insn_buf, sizeof(insn_buf), x86_64);
insn_init(&insn, insn_buff, sizeof(insn_buff), x86_64);
insn_get_length(&insn);
if (insn.next_byte <= insn.kaddr ||
insn.kaddr + MAX_INSN_SIZE < insn.next_byte) {
/* Access out-of-range memory */
dump_stream(stderr, "Error: Found an access violation", i, insn_buf, &insn);
dump_stream(stderr, "Error: Found an access violation", i, insn_buff, &insn);
errors++;
} else if (verbose && !insn_complete(&insn))
dump_stream(stdout, "Info: Found an undecodable input", i, insn_buf, &insn);
dump_stream(stdout, "Info: Found an undecodable input", i, insn_buff, &insn);
else if (verbose >= 2)
dump_insn(stdout, &insn);
insns++;