From: "Emilio G. Cota" <c...@braap.org>
This will enable us to decouple code translation from the value
of parallel_cpus at any given time. It will also help us minimize
TB flushes when generating code via EXCP_ATOMIC.
Note that the declaration of parallel_cpus is brought to exec-all.h
to be able to define there the "curr_cflags" inline.
Signed-off-by: Emilio G. Cota <c...@braap.org>
---
include/exec/exec-all.h | 20 +++++++++++++++++++-
include/exec/tb-hash-xx.h | 9 ++++++---
include/exec/tb-hash.h | 4 ++--
include/exec/tb-lookup.h | 6 +++---
tcg/tcg.h | 1 -
accel/tcg/cpu-exec.c | 45 +++++++++++++++++++++++----------------------
accel/tcg/tcg-runtime.c | 2 +-
accel/tcg/translate-all.c | 13 +++++++++----
exec.c | 2 +-
tests/qht-bench.c | 2 +-
10 files changed, 65 insertions(+), 39 deletions(-)
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 53f1835c43..352abc7450 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -325,6 +325,9 @@ struct TranslationBlock {
#define CF_USE_ICOUNT 0x20000
#define CF_IGNORE_ICOUNT 0x40000 /* Do not generate icount code */
#define CF_INVALID 0x80000 /* TB is stale. Setters must acquire tb_lock */
+#define CF_PARALLEL 0x100000 /* Generate code for a parallel context */
+/* cflags' mask for hashing/comparison */
+#define CF_HASH_MASK (CF_PARALLEL)
/* Per-vCPU dynamic tracing state used to generate this TB */
uint32_t trace_vcpu_dstate;
@@ -365,11 +368,26 @@ struct TranslationBlock {
uintptr_t jmp_list_first;
};
+extern bool parallel_cpus;
+
+/* Hide the atomic_read to make code a little easier on the eyes */
+static inline uint32_t tb_cflags(const TranslationBlock *tb)
+{
+ return atomic_read(&tb->cflags);
+}
+
+/* current cflags for hashing/comparison */
+static inline uint32_t curr_cflags(void)
+{
+ return parallel_cpus ? CF_PARALLEL : 0;
+}
+
void tb_free(TranslationBlock *tb);
void tb_flush(CPUState *cpu);
void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
TranslationBlock *tb_htable_lookup(CPUState *cpu, target_ulong pc,
- target_ulong cs_base, uint32_t flags);
+ target_ulong cs_base, uint32_t flags,
+ uint32_t cf_mask);
void tb_set_jmp_target(TranslationBlock *tb, int n, uintptr_t addr);
/* GETPC is the true target of the return instruction that we'll execute. */
diff --git a/include/exec/tb-hash-xx.h b/include/exec/tb-hash-xx.h
index 6cd3022c07..747a9a612c 100644
--- a/include/exec/tb-hash-xx.h
+++ b/include/exec/tb-hash-xx.h
@@ -48,8 +48,8 @@
* xxhash32, customized for input variables that are not guaranteed to be
* contiguous in memory.
*/
-static inline
-uint32_t tb_hash_func6(uint64_t a0, uint64_t b0, uint32_t e, uint32_t f)
+static inline uint32_t
+tb_hash_func7(uint64_t a0, uint64_t b0, uint32_t e, uint32_t f, uint32_t g)
{
uint32_t v1 = TB_HASH_XX_SEED + PRIME32_1 + PRIME32_2;
uint32_t v2 = TB_HASH_XX_SEED + PRIME32_2;
@@ -78,7 +78,7 @@ uint32_t tb_hash_func6(uint64_t a0, uint64_t b0, uint32_t e,
uint32_t f)
v4 *= PRIME32_1;
h32 = rol32(v1, 1) + rol32(v2, 7) + rol32(v3, 12) + rol32(v4, 18);
- h32 += 24;
+ h32 += 28;
h32 += e * PRIME32_3;
h32 = rol32(h32, 17) * PRIME32_4;
@@ -86,6 +86,9 @@ uint32_t tb_hash_func6(uint64_t a0, uint64_t b0, uint32_t e,
uint32_t f)
h32 += f * PRIME32_3;
h32 = rol32(h32, 17) * PRIME32_4;
+ h32 += g * PRIME32_3;
+ h32 = rol32(h32, 17) * PRIME32_4;
+
h32 ^= h32 >> 15;
h32 *= PRIME32_2;
h32 ^= h32 >> 13;
diff --git a/include/exec/tb-hash.h b/include/exec/tb-hash.h
index 17b5ee0edf..0526c4f678 100644
--- a/include/exec/tb-hash.h
+++ b/include/exec/tb-hash.h
@@ -59,9 +59,9 @@ static inline unsigned int
tb_jmp_cache_hash_func(target_ulong pc)
static inline
uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc, uint32_t flags,
- uint32_t trace_vcpu_dstate)
+ uint32_t cf_mask, uint32_t trace_vcpu_dstate)
{
- return tb_hash_func6(phys_pc, pc, flags, trace_vcpu_dstate);
+ return tb_hash_func7(phys_pc, pc, flags, cf_mask, trace_vcpu_dstate);
}
#endif
diff --git a/include/exec/tb-lookup.h b/include/exec/tb-lookup.h
index 436b6d5ecf..296138591a 100644
--- a/include/exec/tb-lookup.h
+++ b/include/exec/tb-lookup.h
@@ -21,7 +21,7 @@
/* Might cause an exception, so have a longjmp destination ready */
static inline TranslationBlock *
tb_lookup__cpu_state(CPUState *cpu, target_ulong *pc, target_ulong *cs_base,
- uint32_t *flags)
+ uint32_t *flags, uint32_t cf_mask)
{
CPUArchState *env = (CPUArchState *)cpu->env_ptr;
TranslationBlock *tb;
@@ -35,10 +35,10 @@ tb_lookup__cpu_state(CPUState *cpu, target_ulong *pc,
target_ulong *cs_base,
tb->cs_base == *cs_base &&
tb->flags == *flags &&
tb->trace_vcpu_dstate == *cpu->trace_dstate &&
- !(atomic_read(&tb->cflags) & CF_INVALID))) {
+ (tb_cflags(tb) & (CF_HASH_MASK | CF_INVALID)) == cf_mask)) {
return tb;
}
- tb = tb_htable_lookup(cpu, *pc, *cs_base, *flags);
+ tb = tb_htable_lookup(cpu, *pc, *cs_base, *flags, cf_mask);
if (tb == NULL) {
return NULL;
}
diff --git a/tcg/tcg.h b/tcg/tcg.h
index d5bf61b1cf..5e1170b299 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -732,7 +732,6 @@ struct TCGContext {
};
extern TCGContext tcg_ctx;
-extern bool parallel_cpus;
static inline size_t temp_idx(TCGTemp *ts)
{
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index 363dfa208a..39ec9508d1 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -207,7 +207,8 @@ static void cpu_exec_nocache(CPUState *cpu, int max_cycles,
tb_lock();
tb = tb_gen_code(cpu, orig_tb->pc, orig_tb->cs_base, orig_tb->flags,
max_cycles | CF_NOCACHE
- | (ignore_icount ? CF_IGNORE_ICOUNT : 0));
+ | (ignore_icount ? CF_IGNORE_ICOUNT : 0)
+ | curr_cflags());
tb->orig_tb = orig_tb;
tb_unlock();
@@ -225,31 +226,27 @@ static void cpu_exec_nocache(CPUState *cpu, int
max_cycles,
static void cpu_exec_step(CPUState *cpu)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
- CPUArchState *env = (CPUArchState *)cpu->env_ptr;
TranslationBlock *tb;
target_ulong cs_base, pc;
uint32_t flags;
+ uint32_t cflags = 1 | CF_IGNORE_ICOUNT;
- cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
if (sigsetjmp(cpu->jmp_env, 0) == 0) {
- mmap_lock();
- tb_lock();
- tb = tb_gen_code(cpu, pc, cs_base, flags,
- 1 | CF_NOCACHE | CF_IGNORE_ICOUNT);
- tb->orig_tb = NULL;
- tb_unlock();
- mmap_unlock();
+ tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags,
+ cflags & CF_HASH_MASK);
+ if (tb == NULL) {
+ mmap_lock();
+ tb_lock();
+ tb = tb_gen_code(cpu, pc, cs_base, flags, cflags);
+ tb_unlock();
+ mmap_unlock();
+ }
cc->cpu_exec_enter(cpu);
/* execute the generated code */
- trace_exec_tb_nocache(tb, pc);
+ trace_exec_tb(tb, pc);
cpu_tb_exec(cpu, tb);
cc->cpu_exec_exit(cpu);
-
- tb_lock();
- tb_phys_invalidate(tb, -1);
- tb_free(tb);
- tb_unlock();
} else {
/* We may have exited due to another problem here, so we need
* to reset any tb_locks we may have taken but didn't release.
@@ -281,6 +278,7 @@ struct tb_desc {
CPUArchState *env;
tb_page_addr_t phys_page1;
uint32_t flags;
+ uint32_t cf_mask;
uint32_t trace_vcpu_dstate;
};
@@ -294,7 +292,7 @@ static bool tb_cmp(const void *p, const void *d)
tb->cs_base == desc->cs_base &&
tb->flags == desc->flags &&
tb->trace_vcpu_dstate == desc->trace_vcpu_dstate &&
- !(atomic_read(&tb->cflags) & CF_INVALID)) {
+ (tb_cflags(tb) & (CF_HASH_MASK | CF_INVALID)) == desc->cf_mask) {
/* check next page if needed */
if (tb->page_addr[1] == -1) {
return true;
@@ -313,7 +311,8 @@ static bool tb_cmp(const void *p, const void *d)
}
TranslationBlock *tb_htable_lookup(CPUState *cpu, target_ulong pc,
- target_ulong cs_base, uint32_t flags)
+ target_ulong cs_base, uint32_t flags,
+ uint32_t cf_mask)
{
tb_page_addr_t phys_pc;
struct tb_desc desc;
@@ -322,11 +321,12 @@ TranslationBlock *tb_htable_lookup(CPUState *cpu,
target_ulong pc,
desc.env = (CPUArchState *)cpu->env_ptr;
desc.cs_base = cs_base;
desc.flags = flags;
+ desc.cf_mask = cf_mask;
desc.trace_vcpu_dstate = *cpu->trace_dstate;
desc.pc = pc;
phys_pc = get_page_addr_code(desc.env, pc);
desc.phys_page1 = phys_pc & TARGET_PAGE_MASK;
- h = tb_hash_func(phys_pc, pc, flags, *cpu->trace_dstate);
+ h = tb_hash_func(phys_pc, pc, flags, cf_mask, *cpu->trace_dstate);
return qht_lookup(&tcg_ctx.tb_ctx.htable, tb_cmp, &desc, h);
}
@@ -373,8 +373,9 @@ static inline TranslationBlock *tb_find(CPUState *cpu,
target_ulong cs_base, pc;
uint32_t flags;
bool acquired_tb_lock = false;
+ uint32_t cf_mask = curr_cflags();
- tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags);
+ tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags, cf_mask);
if (tb == NULL) {
/* mmap_lock is needed by tb_gen_code, and mmap_lock must be
* taken outside tb_lock. As system emulation is currently
@@ -387,10 +388,10 @@ static inline TranslationBlock *tb_find(CPUState *cpu,
/* There's a chance that our desired tb has been translated while
* taking the locks so we check again inside the lock.
*/
- tb = tb_htable_lookup(cpu, pc, cs_base, flags);
+ tb = tb_htable_lookup(cpu, pc, cs_base, flags, cf_mask);
if (likely(tb == NULL)) {
/* if no translated code available, then translate it now */
- tb = tb_gen_code(cpu, pc, cs_base, flags, 0);
+ tb = tb_gen_code(cpu, pc, cs_base, flags, cf_mask);
}
mmap_unlock();
diff --git a/accel/tcg/tcg-runtime.c b/accel/tcg/tcg-runtime.c
index 54d89100d9..25f0cabfed 100644
--- a/accel/tcg/tcg-runtime.c
+++ b/accel/tcg/tcg-runtime.c
@@ -151,7 +151,7 @@ void *HELPER(lookup_tb_ptr)(CPUArchState *env)
target_ulong cs_base, pc;
uint32_t flags;
- tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags);
+ tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags, curr_cflags());
if (tb == NULL) {
return tcg_ctx.code_gen_epilogue;
}
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index c5ce99d549..1271944ae8 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -1101,7 +1101,8 @@ void tb_phys_invalidate(TranslationBlock *tb,
tb_page_addr_t page_addr)
/* remove the TB from the hash list */
phys_pc = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK);
- h = tb_hash_func(phys_pc, tb->pc, tb->flags, tb->trace_vcpu_dstate);
+ h = tb_hash_func(phys_pc, tb->pc, tb->flags, tb->cflags & CF_HASH_MASK,
+ tb->trace_vcpu_dstate);
qht_remove(&tcg_ctx.tb_ctx.htable, tb, h);
/* remove the TB from the page list */
@@ -1245,7 +1246,8 @@ static void tb_link_page(TranslationBlock *tb,
tb_page_addr_t phys_pc,
}
/* add in the hash table */
- h = tb_hash_func(phys_pc, tb->pc, tb->flags, tb->trace_vcpu_dstate);
+ h = tb_hash_func(phys_pc, tb->pc, tb->flags, tb->cflags & CF_HASH_MASK,
+ tb->trace_vcpu_dstate);
qht_insert(&tcg_ctx.tb_ctx.htable, tb, h);
#ifdef CONFIG_USER_ONLY
@@ -1548,7 +1550,8 @@ void tb_invalidate_phys_page_range(tb_page_addr_t start,
tb_page_addr_t end,
/* we generate a block containing just the instruction
modifying the memory. It will ensure that it cannot modify
itself */
- tb_gen_code(cpu, current_pc, current_cs_base, current_flags, 1);
+ tb_gen_code(cpu, current_pc, current_cs_base, current_flags,
+ 1 | curr_cflags());
cpu_loop_exit_noexc(cpu);
}
#endif
@@ -1666,7 +1669,8 @@ static bool tb_invalidate_phys_page(tb_page_addr_t addr,
uintptr_t pc)
/* we generate a block containing just the instruction
modifying the memory. It will ensure that it cannot modify
itself */
- tb_gen_code(cpu, current_pc, current_cs_base, current_flags, 1);
+ tb_gen_code(cpu, current_pc, current_cs_base, current_flags,
+ 1 | curr_cflags());
/* tb_lock will be reset after cpu_loop_exit_noexc longjmps
* back into the cpu_exec loop. */
return true;
@@ -1810,6 +1814,7 @@ void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr)
}
cflags = n | CF_LAST_IO;
+ cflags |= curr_cflags();
pc = tb->pc;
cs_base = tb->cs_base;
flags = tb->flags;
diff --git a/exec.c b/exec.c
index 30a1a9fb79..5d43d9541f 100644
--- a/exec.c
+++ b/exec.c
@@ -2435,7 +2435,7 @@ static void check_watchpoint(int offset, int len,
MemTxAttrs attrs, int flags)
cpu_loop_exit(cpu);
} else {
cpu_get_tb_cpu_state(env, &pc, &cs_base, &cpu_flags);
- tb_gen_code(cpu, pc, cs_base, cpu_flags, 1);
+ tb_gen_code(cpu, pc, cs_base, cpu_flags, 1 |
curr_cflags());
cpu_loop_exit_noexc(cpu);
}
}
diff --git a/tests/qht-bench.c b/tests/qht-bench.c
index 11c1cec766..4cabdfd62a 100644
--- a/tests/qht-bench.c
+++ b/tests/qht-bench.c
@@ -103,7 +103,7 @@ static bool is_equal(const void *obj, const void *userp)
static inline uint32_t h(unsigned long v)
{
- return tb_hash_func6(v, 0, 0, 0);
+ return tb_hash_func7(v, 0, 0, 0, 0);
}
/*
--
2.13.6
