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[7/9] kvm: Switch to unlocked PIO

Message ID 1435163110-2724-8-git-send-email-pbonzini@redhat.com
State New
Headers show

Commit Message

Paolo Bonzini June 24, 2015, 4:25 p.m. UTC 
From: Jan Kiszka <jan.kiszka@siemens.com>

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>
---
 kvm-all.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff mbox

Patch

diff --git a/kvm-all.c b/kvm-all.c
index af3d10b..07bdcfa 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1801,13 +1801,12 @@  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: