From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56593) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WwxL7-0005Jj-R4 for qemu-devel@nongnu.org; Tue, 17 Jun 2014 13:38:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WwxL2-0003m2-0U for qemu-devel@nongnu.org; Tue, 17 Jun 2014 13:38:33 -0400 Received: from mx1.redhat.com ([209.132.183.28]:25598) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WwxL1-0003lt-O7 for qemu-devel@nongnu.org; Tue, 17 Jun 2014 13:38:27 -0400 Date: Tue, 17 Jun 2014 20:38:47 +0300 From: "Michael S. Tsirkin" Message-ID: <1403021756-15960-45-git-send-email-mst@redhat.com> References: <1403021756-15960-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1403021756-15960-1-git-send-email-mst@redhat.com> Subject: [Qemu-devel] [PULL 044/103] Add kvm_eventfds_enabled function List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Peter Maydell , kvm@vger.kernel.org, Alexander Graf , Nikolay Nikolaev , Anthony Liguori , Antonios Motakis , Cornelia Huck , Paolo Bonzini , =?us-ascii?B?PT9VVEYtOD9xP0FuZHJlYXM9MjBGPUMzPUE0cmJlcj89?= , Richard Henderson From: Nikolay Nikolaev Add a function to check if the eventfd capability is present in KVM in the host kernel. Signed-off-by: Antonios Motakis Signed-off-by: Nikolay Nikolaev Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Acked-by: Paolo Bonzini --- include/sysemu/kvm.h | 11 +++++++++++ kvm-all.c | 4 ++++ kvm-stub.c | 1 + 3 files changed, 16 insertions(+) diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h index e79e92c..c4556ad 100644 --- a/include/sysemu/kvm.h +++ b/include/sysemu/kvm.h @@ -43,6 +43,7 @@ extern bool kvm_allowed; extern bool kvm_kernel_irqchip; extern bool kvm_async_interrupts_allowed; extern bool kvm_halt_in_kernel_allowed; +extern bool kvm_eventfds_allowed; extern bool kvm_irqfds_allowed; extern bool kvm_msi_via_irqfd_allowed; extern bool kvm_gsi_routing_allowed; @@ -83,6 +84,15 @@ extern bool kvm_readonly_mem_allowed; #define kvm_halt_in_kernel() (kvm_halt_in_kernel_allowed) /** + * kvm_eventfds_enabled: + * + * Returns: true if we can use eventfds to receive notifications + * from a KVM CPU (ie the kernel supports eventds and we are running + * with a configuration where it is meaningful to use them). + */ +#define kvm_eventfds_enabled() (kvm_eventfds_allowed) + +/** * kvm_irqfds_enabled: * * Returns: true if we can use irqfds to inject interrupts into @@ -128,6 +138,7 @@ extern bool kvm_readonly_mem_allowed; #define kvm_irqchip_in_kernel() (false) #define kvm_async_interrupts_enabled() (false) #define kvm_halt_in_kernel() (false) +#define kvm_eventfds_enabled() (false) #define kvm_irqfds_enabled() (false) #define kvm_msi_via_irqfd_enabled() (false) #define kvm_gsi_routing_allowed() (false) diff --git a/kvm-all.c b/kvm-all.c index 4e19eff..92f56d8 100644 --- a/kvm-all.c +++ b/kvm-all.c @@ -113,6 +113,7 @@ KVMState *kvm_state; bool kvm_kernel_irqchip; bool kvm_async_interrupts_allowed; bool kvm_halt_in_kernel_allowed; +bool kvm_eventfds_allowed; bool kvm_irqfds_allowed; bool kvm_msi_via_irqfd_allowed; bool kvm_gsi_routing_allowed; @@ -1541,6 +1542,9 @@ int kvm_init(MachineClass *mc) (kvm_check_extension(s, KVM_CAP_READONLY_MEM) > 0); #endif + kvm_eventfds_allowed = + (kvm_check_extension(s, KVM_CAP_IOEVENTFD) > 0); + ret = kvm_arch_init(s); if (ret < 0) { goto err; diff --git a/kvm-stub.c b/kvm-stub.c index ac33d86..8e7737c 100644 --- a/kvm-stub.c +++ b/kvm-stub.c @@ -22,6 +22,7 @@ KVMState *kvm_state; bool kvm_kernel_irqchip; bool kvm_async_interrupts_allowed; +bool kvm_eventfds_allowed; bool kvm_irqfds_allowed; bool kvm_msi_via_irqfd_allowed; bool kvm_gsi_routing_allowed; -- MST