Do not take the BQL before dispatching MMIO requests of KVM VCPUs.
Instead, address_space_rw will do it if necessary. This enables completely
BQL-free MMIO handling in KVM mode for upcoming devices with fine-grained
locking.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
kvm-all.c | 3 +--
1 file changed, 3 deletions(-)
diff --git a/kvm-all.c b/kvm-all.c
index d3831c4..87b00b8 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1845,13 +1845,12 @@ int kvm_cpu_exec(CPUState *cpu)
break;
case KVM_EXIT_MMIO:
DPRINTF("handle_mmio\n");
- qemu_mutex_lock_iothread();
+ /* Called outside BQL */
address_space_rw(&address_space_memory,
run->mmio.phys_addr, attrs,
run->mmio.data,
run->mmio.len,
run->mmio.is_write);
- qemu_mutex_unlock_iothread();
ret = 0;
break;
case KVM_EXIT_IRQ_WINDOW_OPEN:
--
1.8.3.1
