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[v3,10/43] exec-all: bring tb->invalid into tb->cflags

Message ID 1500520169-23367-11-git-send-email-cota@braap.org
State New
Headers show

Commit Message

Emilio Cota July 20, 2017, 3:08 a.m. UTC 
This gets rid of a hole in struct TranslationBlock.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Emilio G. Cota <cota@braap.org>
---
 include/exec/exec-all.h   | 3 +--
 include/exec/tb-lookup.h  | 2 +-
 accel/tcg/cpu-exec.c      | 4 ++--
 accel/tcg/translate-all.c | 3 +--
 4 files changed, 5 insertions(+), 7 deletions(-)
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Patch

diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 69c1b36..256b9a6 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -352,12 +352,11 @@  struct TranslationBlock {
 #define CF_NOCACHE     0x10000 /* To be freed after execution */
 #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 */
 
     /* Per-vCPU dynamic tracing state used to generate this TB */
     uint32_t trace_vcpu_dstate;
 
-    uint16_t invalid;
-
     void *tc_ptr;    /* pointer to the translated code */
     uint8_t *tc_search;  /* pointer to search data */
     /* original tb when cflags has CF_NOCACHE */
diff --git a/include/exec/tb-lookup.h b/include/exec/tb-lookup.h
index 9d32cb0..436b6d5 100644
--- a/include/exec/tb-lookup.h
+++ b/include/exec/tb-lookup.h
@@ -35,7 +35,7 @@  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->invalid))) {
+               !(atomic_read(&tb->cflags) & CF_INVALID))) {
         return tb;
     }
     tb = tb_htable_lookup(cpu, *pc, *cs_base, *flags);
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index 5d2ee5b..fae8c40 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -294,7 +294,7 @@  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->invalid)) {
+        !(atomic_read(&tb->cflags) & CF_INVALID)) {
         /* check next page if needed */
         if (tb->page_addr[1] == -1) {
             return true;
@@ -377,7 +377,7 @@  static inline TranslationBlock *tb_find(CPUState *cpu,
             tb_lock();
             acquired_tb_lock = true;
         }
-        if (!tb->invalid) {
+        if (!(tb->cflags & CF_INVALID)) {
             tb_add_jump(last_tb, tb_exit, tb);
         }
     }
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index a124181..7ef4f19 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -1073,7 +1073,7 @@  void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr)
 
     assert_tb_locked();
 
-    atomic_set(&tb->invalid, true);
+    atomic_set(&tb->cflags, tb->cflags | CF_INVALID);
 
     /* remove the TB from the hash list */
     phys_pc = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK);
@@ -1269,7 +1269,6 @@  TranslationBlock *tb_gen_code(CPUState *cpu,
     tb->flags = flags;
     tb->cflags = cflags;
     tb->trace_vcpu_dstate = *cpu->trace_dstate;
-    tb->invalid = false;
 
 #ifdef CONFIG_PROFILER
     tcg_ctx.tb_count1++; /* includes aborted translations because of