[Qemu-devel] [PULL 13/21] exec: introduce cpu_reload_memory_map

[Paolo Bonzini <pbonzini@redhat.com>]

This for now is a simple TLB flush.  This can change later for two
reasons:

1) an AddressSpaceDispatch will be cached in the CPUState object

2) it will not be possible to do tlb_flush once the TCG-generated code
runs outside the BQL.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 cpu-exec.c              | 6 ++++++
 exec.c                  | 2 +-
 include/exec/exec-all.h | 1 +
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/cpu-exec.c b/cpu-exec.c
index fa506e6..78fe382 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -141,6 +141,12 @@ void cpu_resume_from_signal(CPUState *cpu, void *puc)
     cpu->exception_index = -1;
     siglongjmp(cpu->jmp_env, 1);
 }
+
+void cpu_reload_memory_map(CPUState *cpu)
+{
+    /* The TLB is protected by the iothread lock.  */
+    tlb_flush(cpu, 1);
+}
 #endif
 
 /* Execute a TB, and fix up the CPU state afterwards if necessary */
diff --git a/exec.c b/exec.c
index 6dff7bc..2bfb4d3 100644
--- a/exec.c
+++ b/exec.c
@@ -2026,7 +2026,7 @@ static void tcg_commit(MemoryListener *listener)
         if (cpu->tcg_as_listener != listener) {
             continue;
         }
-        tlb_flush(cpu, 1);
+        cpu_reload_memory_map(cpu);
     }
 }
 
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 6a15448..1b30813 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -96,6 +96,7 @@ void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end,
 void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end,
                               int is_cpu_write_access);
 #if !defined(CONFIG_USER_ONLY)
+void cpu_reload_memory_map(CPUState *cpu);
 void tcg_cpu_address_space_init(CPUState *cpu, AddressSpace *as);
 /* cputlb.c */
 void tlb_flush_page(CPUState *cpu, target_ulong addr);
-- 
2.3.0