cputlb: Merge and move memory_notdirty_write_{prepare,complete}
Since 9458a9a1df1a, all readers of the dirty bitmaps wait
for the rcu lock, which means that they wait until the end
of any executing TranslationBlock.
As a consequence, there is no need for the actual access
to happen in between the _prepare and _complete. Therefore,
we can improve things by merging the two functions into
notdirty_write and dropping the NotDirtyInfo structure.
In addition, the only users of notdirty_write are in cputlb.c,
so move the merged function there. Pass in the CPUIOTLBEntry
from which the ram_addr_t may be computed.
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
index 4f118d2..3e91838 100644
--- a/accel/tcg/cputlb.c
+++ b/accel/tcg/cputlb.c
@@ -33,6 +33,7 @@
#include "exec/helper-proto.h"
#include "qemu/atomic.h"
#include "qemu/atomic128.h"
+#include "translate-all.h"
/* DEBUG defines, enable DEBUG_TLB_LOG to log to the CPU_LOG_MMU target */
/* #define DEBUG_TLB */
@@ -1085,6 +1086,37 @@
return qemu_ram_addr_from_host_nofail(p);
}
+static void notdirty_write(CPUState *cpu, vaddr mem_vaddr, unsigned size,
+ CPUIOTLBEntry *iotlbentry, uintptr_t retaddr)
+{
+ ram_addr_t ram_addr = mem_vaddr + iotlbentry->addr;
+
+ trace_memory_notdirty_write_access(mem_vaddr, ram_addr, 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);
+ page_collection_unlock(pages);
+ }
+
+ /*
+ * Set both VGA and migration bits for simplicity and to remove
+ * the notdirty callback faster.
+ */
+ cpu_physical_memory_set_dirty_range(ram_addr, size, DIRTY_CLIENTS_NOCODE);
+
+ /* We remove the notdirty callback only if the code has been flushed. */
+ if (!cpu_physical_memory_is_clean(ram_addr)) {
+ trace_memory_notdirty_set_dirty(mem_vaddr);
+ tlb_set_dirty(cpu, mem_vaddr);
+ }
+}
+
/*
* Probe for whether the specified guest access is permitted. If it is not
* permitted then an exception will be taken in the same way as if this
@@ -1204,8 +1236,7 @@
/* Probe for a read-modify-write atomic operation. Do not allow unaligned
* operations, or io operations to proceed. Return the host address. */
static void *atomic_mmu_lookup(CPUArchState *env, target_ulong addr,
- TCGMemOpIdx oi, uintptr_t retaddr,
- NotDirtyInfo *ndi)
+ TCGMemOpIdx oi, uintptr_t retaddr)
{
size_t mmu_idx = get_mmuidx(oi);
uintptr_t index = tlb_index(env, mmu_idx, addr);
@@ -1265,12 +1296,9 @@
hostaddr = (void *)((uintptr_t)addr + tlbe->addend);
- ndi->active = false;
if (unlikely(tlb_addr & TLB_NOTDIRTY)) {
- ndi->active = true;
- memory_notdirty_write_prepare(ndi, env_cpu(env), addr,
- qemu_ram_addr_from_host_nofail(hostaddr),
- 1 << s_bits);
+ notdirty_write(env_cpu(env), addr, 1 << s_bits,
+ &env_tlb(env)->d[mmu_idx].iotlb[index], retaddr);
}
return hostaddr;
@@ -1641,28 +1669,13 @@
return;
}
- haddr = (void *)((uintptr_t)addr + entry->addend);
-
/* Handle clean RAM pages. */
if (tlb_addr & TLB_NOTDIRTY) {
- NotDirtyInfo ndi;
-
- /* We require mem_io_pc in tb_invalidate_phys_page_range. */
- env_cpu(env)->mem_io_pc = retaddr;
-
- memory_notdirty_write_prepare(&ndi, env_cpu(env), addr,
- addr + iotlbentry->addr, size);
-
- if (unlikely(need_swap)) {
- store_memop(haddr, val, op ^ MO_BSWAP);
- } else {
- store_memop(haddr, val, op);
- }
-
- memory_notdirty_write_complete(&ndi);
- return;
+ notdirty_write(env_cpu(env), addr, size, iotlbentry, retaddr);
}
+ haddr = (void *)((uintptr_t)addr + entry->addend);
+
/*
* Keep these two store_memop separate to ensure that the compiler
* is able to fold the entire function to a single instruction.
@@ -1793,14 +1806,9 @@
#define EXTRA_ARGS , TCGMemOpIdx oi, uintptr_t retaddr
#define ATOMIC_NAME(X) \
HELPER(glue(glue(glue(atomic_ ## X, SUFFIX), END), _mmu))
-#define ATOMIC_MMU_DECLS NotDirtyInfo ndi
-#define ATOMIC_MMU_LOOKUP atomic_mmu_lookup(env, addr, oi, retaddr, &ndi)
-#define ATOMIC_MMU_CLEANUP \
- do { \
- if (unlikely(ndi.active)) { \
- memory_notdirty_write_complete(&ndi); \
- } \
- } while (0)
+#define ATOMIC_MMU_DECLS
+#define ATOMIC_MMU_LOOKUP atomic_mmu_lookup(env, addr, oi, retaddr)
+#define ATOMIC_MMU_CLEANUP
#define DATA_SIZE 1
#include "atomic_template.h"
@@ -1828,7 +1836,7 @@
#undef ATOMIC_MMU_LOOKUP
#define EXTRA_ARGS , TCGMemOpIdx oi
#define ATOMIC_NAME(X) HELPER(glue(glue(atomic_ ## X, SUFFIX), END))
-#define ATOMIC_MMU_LOOKUP atomic_mmu_lookup(env, addr, oi, GETPC(), &ndi)
+#define ATOMIC_MMU_LOOKUP atomic_mmu_lookup(env, addr, oi, GETPC())
#define DATA_SIZE 1
#include "atomic_template.h"
