[PATCH] accel/tcg: Revert mapping of PCREL translation block to multiple virtual addresses

[Paolo Bonzini]

This is causing regressions that have not been analyzed yet.  Revert the
change on stable branches.

Related: https://gitlab.com/qemu-project/qemu/-/issues/2092
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 include/exec/exec-all.h   | 6 ------
 accel/tcg/cpu-exec.c      | 4 ++--
 accel/tcg/tb-maint.c      | 6 +++---
 accel/tcg/translate-all.c | 2 --
 4 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 9b7bfbf09ac..db677c856b0 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -503,7 +503,6 @@ struct tb_tc {
 };
 
 struct TranslationBlock {
-#if !TARGET_TB_PCREL
     /*
      * Guest PC corresponding to this block.  This must be the true
      * virtual address.  Therefore e.g. x86 stores EIP + CS_BASE, and
@@ -518,7 +517,6 @@ struct TranslationBlock {
      * deposited into the "current" PC.
      */
     target_ulong pc;
-#endif
 
     /*
      * Target-specific data associated with the TranslationBlock, e.g.:
@@ -604,11 +602,7 @@ struct TranslationBlock {
 /* Hide the read to avoid ifdefs for TARGET_TB_PCREL. */
 static inline target_ulong tb_pc(const TranslationBlock *tb)
 {
-#if TARGET_TB_PCREL
-    qemu_build_not_reached();
-#else
     return tb->pc;
-#endif
 }
 
 /* Hide the qatomic_read to make code a little easier on the eyes */
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index 356fe348de1..68fef3e01f5 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -186,7 +186,7 @@ static bool tb_lookup_cmp(const void *p, const void *d)
     const TranslationBlock *tb = p;
     const struct tb_desc *desc = d;
 
-    if ((TARGET_TB_PCREL || tb_pc(tb) == desc->pc) &&
+    if (tb_pc(tb) == desc->pc &&
         tb_page_addr0(tb) == desc->page_addr0 &&
         tb->cs_base == desc->cs_base &&
         tb->flags == desc->flags &&
@@ -238,7 +238,7 @@ static TranslationBlock *tb_htable_lookup(CPUState *cpu, 
target_ulong pc,
         return NULL;
     }
     desc.page_addr0 = phys_pc;
-    h = tb_hash_func(phys_pc, (TARGET_TB_PCREL ? 0 : pc),
+    h = tb_hash_func(phys_pc, pc,
                      flags, cflags, *cpu->trace_dstate);
     return qht_lookup_custom(&tb_ctx.htable, &desc, h, tb_lookup_cmp);
 }
diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index 0cdb35548c1..9d9f651c78e 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -34,7 +34,7 @@ static bool tb_cmp(const void *ap, const void *bp)
     const TranslationBlock *a = ap;
     const TranslationBlock *b = bp;
 
-    return ((TARGET_TB_PCREL || tb_pc(a) == tb_pc(b)) &&
+    return (tb_pc(a) == tb_pc(b) &&
             a->cs_base == b->cs_base &&
             a->flags == b->flags &&
             (tb_cflags(a) & ~CF_INVALID) == (tb_cflags(b) & ~CF_INVALID) &&
@@ -269,7 +269,7 @@ static void do_tb_phys_invalidate(TranslationBlock *tb, 
bool rm_from_page_list)
 
     /* remove the TB from the hash list */
     phys_pc = tb_page_addr0(tb);
-    h = tb_hash_func(phys_pc, (TARGET_TB_PCREL ? 0 : tb_pc(tb)),
+    h = tb_hash_func(phys_pc, tb_pc(tb),
                      tb->flags, orig_cflags, tb->trace_vcpu_dstate);
     if (!qht_remove(&tb_ctx.htable, tb, h)) {
         return;
@@ -459,7 +459,7 @@ TranslationBlock *tb_link_page(TranslationBlock *tb, 
tb_page_addr_t phys_pc,
     }
 
     /* add in the hash table */
-    h = tb_hash_func(phys_pc, (TARGET_TB_PCREL ? 0 : tb_pc(tb)),
+    h = tb_hash_func(phys_pc, tb_pc(tb),
                      tb->flags, tb->cflags, tb->trace_vcpu_dstate);
     qht_insert(&tb_ctx.htable, tb, h, &existing_tb);
 
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index ac3ee3740cb..ed8ddee6e88 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -818,9 +818,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
 
     gen_code_buf = tcg_ctx->code_gen_ptr;
     tb->tc.ptr = tcg_splitwx_to_rx(gen_code_buf);
-#if !TARGET_TB_PCREL
     tb->pc = pc;
-#endif
     tb->cs_base = cs_base;
     tb->flags = flags;
     tb->cflags = cflags;
-- 
2.43.0