From: KONRAD Frederic <fred.kon...@greensocs.com>
Some architectures allow to flush the tlb of other VCPUs. This is not a problem
when we have only one thread for all VCPUs but it definitely needs to be an
asynchronous work when we are in true multithreaded work.
TODO: Some test case, I fear some bad results in case a VCPUs execute a barrier
or something like that.
Signed-off-by: KONRAD Frederic <fred.kon...@greensocs.com>
---
cputlb.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++
include/exec/exec-all.h | 2 ++
2 files changed, 78 insertions(+)
diff --git a/cputlb.c b/cputlb.c
index 79fff1c..e5853fd 100644
--- a/cputlb.c
+++ b/cputlb.c
@@ -72,6 +72,45 @@ void tlb_flush(CPUState *cpu, int flush_global)
tlb_flush_count++;
}
+struct TLBFlushParams {
+ CPUState *cpu;
+ int flush_global;
+};
+
+static void tlb_flush_async_work(void *opaque)
+{
+ struct TLBFlushParams *params = opaque;
+
+ tlb_flush(params->cpu, params->flush_global);
+ g_free(params);
+}
+
+void tlb_flush_all(int flush_global)
+{
+ CPUState *cpu;
+ struct TLBFlushParams *params;
+
+#if 0 /* MTTCG */
+ CPU_FOREACH(cpu) {
+ tlb_flush(cpu, flush_global);
+ }
+#else
+ CPU_FOREACH(cpu) {
+ if (qemu_cpu_is_self(cpu)) {
+ /* async_run_on_cpu handle this case but this just avoid a malloc
+ * here.
+ */
+ tlb_flush(cpu, flush_global);
+ } else {
+ params = g_malloc(sizeof(struct TLBFlushParams));
+ params->cpu = cpu;
+ params->flush_global = flush_global;
+ async_run_on_cpu(cpu, tlb_flush_async_work, params);
+ }
+ }
+#endif /* MTTCG */
+}
+
static inline void tlb_flush_entry(CPUTLBEntry *tlb_entry, target_ulong addr)
{
if (addr == (tlb_entry->addr_read &
@@ -124,6 +163,43 @@ void tlb_flush_page(CPUState *cpu, target_ulong addr)
tb_flush_jmp_cache(cpu, addr);
}
+struct TLBFlushPageParams {
+ CPUState *cpu;
+ target_ulong addr;
+};
+
+static void tlb_flush_page_async_work(void *opaque)
+{
+ struct TLBFlushPageParams *params = opaque;
+
+ tlb_flush_page(params->cpu, params->addr);
+ g_free(params);
+}
+
+void tlb_flush_page_all(target_ulong addr)
+{
+ CPUState *cpu;
+ struct TLBFlushPageParams *params;
+
+ CPU_FOREACH(cpu) {
+#if 0 /* !MTTCG */
+ tlb_flush_page(cpu, addr);
+#else
+ if (qemu_cpu_is_self(cpu)) {
+ /* async_run_on_cpu handle this case but this just avoid a malloc
+ * here.
+ */
+ tlb_flush_page(cpu, addr);
+ } else {
+ params = g_malloc(sizeof(struct TLBFlushPageParams));
+ params->cpu = cpu;
+ params->addr = addr;
+ async_run_on_cpu(cpu, tlb_flush_page_async_work, params);
+ }
+#endif /* MTTCG */
+ }
+}
+
/* update the TLBs so that writes to code in the virtual page 'addr'
can be detected */
void tlb_protect_code(ram_addr_t ram_addr)
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 44f3336..484c351 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -96,7 +96,9 @@ bool qemu_in_vcpu_thread(void);
void cpu_reload_memory_map(CPUState *cpu);
void tcg_cpu_address_space_init(CPUState *cpu, AddressSpace *as);
/* cputlb.c */
+void tlb_flush_page_all(target_ulong addr);
void tlb_flush_page(CPUState *cpu, target_ulong addr);
+void tlb_flush_all(int flush_global);
void tlb_flush(CPUState *cpu, int flush_global);
void tlb_set_page(CPUState *cpu, target_ulong vaddr,
hwaddr paddr, int prot,
--
1.9.0
