[PATCH v4 15/16] cputlb: Pass retaddr to tb_invalidate_phys_page_fast

[Richard Henderson <richard.henderson@linaro.org>]

Rather than rely on cpu->mem_io_pc, pass retaddr down directly.

Within tb_invalidate_phys_page_range__locked, the is_cpu_write_access
parameter is non-zero exactly when retaddr would be non-zero, so that
is a simple replacement.

Recognize that current_tb_not_found is true only when mem_io_pc
(and now retaddr) are also non-zero, so remove a redundant test.

Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/translate-all.h |  3 ++-
 accel/tcg/cputlb.c        |  6 +-----
 accel/tcg/translate-all.c | 39 +++++++++++++++++++--------------------
 3 files changed, 22 insertions(+), 26 deletions(-)

diff --git a/accel/tcg/translate-all.h b/accel/tcg/translate-all.h
index 31f2117188..135c1ea96a 100644
--- a/accel/tcg/translate-all.h
+++ b/accel/tcg/translate-all.h
@@ -27,7 +27,8 @@ struct page_collection *page_collection_lock(tb_page_addr_t start,
                                              tb_page_addr_t end);
 void page_collection_unlock(struct page_collection *set);
 void tb_invalidate_phys_page_fast(struct page_collection *pages,
-                                  tb_page_addr_t start, int len);
+                                  tb_page_addr_t start, int len,
+                                  uintptr_t retaddr);
 void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end);
 void tb_check_watchpoint(CPUState *cpu);
 
diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
index 0ca6ee60b3..ea5d12c59d 100644
--- a/accel/tcg/cputlb.c
+++ b/accel/tcg/cputlb.c
@@ -1093,11 +1093,7 @@ static void notdirty_write(CPUState *cpu, vaddr mem_vaddr, unsigned size,
     if (!cpu_physical_memory_get_dirty_flag(ram_addr, DIRTY_MEMORY_CODE)) {
         struct page_collection *pages
             = page_collection_lock(ram_addr, ram_addr + size);
-
-        /* We require mem_io_pc in tb_invalidate_phys_page_range.  */
-        cpu->mem_io_pc = retaddr;
-
-        tb_invalidate_phys_page_fast(pages, ram_addr, size);
+        tb_invalidate_phys_page_fast(pages, ram_addr, size, retaddr);
         page_collection_unlock(pages);
     }
 
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index de4b697163..db77fb221b 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -1889,7 +1889,7 @@ static void
 tb_invalidate_phys_page_range__locked(struct page_collection *pages,
                                       PageDesc *p, tb_page_addr_t start,
                                       tb_page_addr_t end,
-                                      int is_cpu_write_access)
+                                      uintptr_t retaddr)
 {
     TranslationBlock *tb;
     tb_page_addr_t tb_start, tb_end;
@@ -1897,9 +1897,9 @@ tb_invalidate_phys_page_range__locked(struct page_collection *pages,
 #ifdef TARGET_HAS_PRECISE_SMC
     CPUState *cpu = current_cpu;
     CPUArchState *env = NULL;
-    int current_tb_not_found = is_cpu_write_access;
+    bool current_tb_not_found = retaddr != 0;
+    bool current_tb_modified = false;
     TranslationBlock *current_tb = NULL;
-    int current_tb_modified = 0;
     target_ulong current_pc = 0;
     target_ulong current_cs_base = 0;
     uint32_t current_flags = 0;
@@ -1931,24 +1931,21 @@ tb_invalidate_phys_page_range__locked(struct page_collection *pages,
         if (!(tb_end <= start || tb_start >= end)) {
 #ifdef TARGET_HAS_PRECISE_SMC
             if (current_tb_not_found) {
-                current_tb_not_found = 0;
-                current_tb = NULL;
-                if (cpu->mem_io_pc) {
-                    /* now we have a real cpu fault */
-                    current_tb = tcg_tb_lookup(cpu->mem_io_pc);
-                }
+                current_tb_not_found = false;
+                /* now we have a real cpu fault */
+                current_tb = tcg_tb_lookup(retaddr);
             }
             if (current_tb == tb &&
                 (tb_cflags(current_tb) & CF_COUNT_MASK) != 1) {
-                /* If we are modifying the current TB, we must stop
-                its execution. We could be more precise by checking
-                that the modification is after the current PC, but it
-                would require a specialized function to partially
-                restore the CPU state */
-
-                current_tb_modified = 1;
-                cpu_restore_state_from_tb(cpu, current_tb,
-                                          cpu->mem_io_pc, true);
+                /*
+                 * If we are modifying the current TB, we must stop
+                 * its execution. We could be more precise by checking
+                 * that the modification is after the current PC, but it
+                 * would require a specialized function to partially
+                 * restore the CPU state.
+                 */
+                current_tb_modified = true;
+                cpu_restore_state_from_tb(cpu, current_tb, retaddr, true);
                 cpu_get_tb_cpu_state(env, &current_pc, &current_cs_base,
                                      &current_flags);
             }
@@ -2042,7 +2039,8 @@ void tb_invalidate_phys_range(target_ulong start, target_ulong end)
  * Call with all @pages in the range [@start, @start + len[ locked.
  */
 void tb_invalidate_phys_page_fast(struct page_collection *pages,
-                                  tb_page_addr_t start, int len)
+                                  tb_page_addr_t start, int len,
+                                  uintptr_t retaddr)
 {
     PageDesc *p;
 
@@ -2069,7 +2067,8 @@ void tb_invalidate_phys_page_fast(struct page_collection *pages,
         }
     } else {
     do_invalidate:
-        tb_invalidate_phys_page_range__locked(pages, p, start, start + len, 1);
+        tb_invalidate_phys_page_range__locked(pages, p, start, start + len,
+                                              retaddr);
     }
 }
 #else
-- 
2.17.1