From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36262) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZAZkD-0003km-DR for qemu-devel@nongnu.org; Thu, 02 Jul 2015 04:21:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZAZk9-0003A3-ER for qemu-devel@nongnu.org; Thu, 02 Jul 2015 04:21:17 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37597) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZAZk5-00038a-Ut for qemu-devel@nongnu.org; Thu, 02 Jul 2015 04:21:13 -0400 From: Paolo Bonzini Date: Thu, 2 Jul 2015 10:20:49 +0200 Message-Id: <1435825251-674-8-git-send-email-pbonzini@redhat.com> In-Reply-To: <1435825251-674-1-git-send-email-pbonzini@redhat.com> References: <1435825251-674-1-git-send-email-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH 7/9] kvm: Switch to unlocked PIO List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Jan Kiszka , famz@redhat.com From: Jan Kiszka 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 --- kvm-all.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/kvm-all.c b/kvm-all.c index ca428ca..ad5ac5e 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: -- 2.4.3