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authorPaolo Bonzini <pbonzini@redhat.com>2013-08-16 08:26:30 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2015-02-16 17:30:19 +0100
commit9d82b5a792236db31a75b9db5c93af69ac07c7c5 (patch)
tree95682ab6099e8e318102678fcba9cd2b62b9568c /cpu-exec.c
parent76e5c76f2e2e0d20bab2cd5c7a87452f711654fb (diff)
exec: make iotlb RCU-friendly
After the previous patch, TLBs will be flushed on every change to the memory mapping. This patch augments that with synchronization of the MemoryRegionSections referred to in the iotlb array. With this change, it is guaranteed that iotlb_to_region will access the correct memory map, even once the TLB will be accessed outside the BQL. Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'cpu-exec.c')
-rw-r--r--cpu-exec.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/cpu-exec.c b/cpu-exec.c
index 78fe382162..98f968df60 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -24,6 +24,8 @@
#include "qemu/atomic.h"
#include "sysemu/qtest.h"
#include "qemu/timer.h"
+#include "exec/address-spaces.h"
+#include "exec/memory-internal.h"
/* -icount align implementation. */
@@ -144,7 +146,9 @@ void cpu_resume_from_signal(CPUState *cpu, void *puc)
void cpu_reload_memory_map(CPUState *cpu)
{
- /* The TLB is protected by the iothread lock. */
+ /* The CPU and TLB are protected by the iothread lock. */
+ AddressSpaceDispatch *d = cpu->as->dispatch;
+ cpu->memory_dispatch = d;
tlb_flush(cpu, 1);
}
#endif