aboutsummaryrefslogtreecommitdiff
path: root/kvm-all.c
diff options
context:
space:
mode:
authorJan Kiszka <jan.kiszka@siemens.com>2015-06-18 18:47:24 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2015-07-01 15:45:51 +0200
commit80b7d2efb63c225797345c152cdd3392b9fe7b72 (patch)
treec17c0c50d7d999e60508d671eebd25bdd6e38d1d /kvm-all.c
parent4b8523ee896750c37b4fa224a40d34703cbdf4c6 (diff)
downloadqemu-arm-80b7d2efb63c225797345c152cdd3392b9fe7b72.tar.gz
kvm: Switch to unlocked PIO
Do not take the BQL before dispatching PIO requests of KVM VCPUs. Instead, address_space_rw will do it if necessary. This enables completely BQL-free PIO handling in KVM mode for upcoming devices with fine-grained locking. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1434646046-27150-8-git-send-email-pbonzini@redhat.com>
Diffstat (limited to 'kvm-all.c')
-rw-r--r--kvm-all.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/kvm-all.c b/kvm-all.c
index ca428ca298..ad5ac5e3df 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1804,13 +1804,12 @@ int kvm_cpu_exec(CPUState *cpu)
switch (run->exit_reason) {
case KVM_EXIT_IO:
DPRINTF("handle_io\n");
- qemu_mutex_lock_iothread();
+ /* Called outside BQL */
kvm_handle_io(run->io.port, attrs,
(uint8_t *)run + run->io.data_offset,
run->io.direction,
run->io.size,
run->io.count);
- qemu_mutex_unlock_iothread();
ret = 0;
break;
case KVM_EXIT_MMIO: