From 80b7d2efb63c225797345c152cdd3392b9fe7b72 Mon Sep 17 00:00:00 2001 From: Jan Kiszka Date: Thu, 18 Jun 2015 18:47:24 +0200 Subject: [PATCH] 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 Signed-off-by: Paolo Bonzini Message-Id: <1434646046-27150-8-git-send-email-pbonzini@redhat.com> --- kvm-all.c | 3 +-- 1 file changed, 1 insertion(+), 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: -- 2.11.4.GIT