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[Qemu-devel] [PATCH v9 02/20] Add kvm_eventfds_enabled function
From: |
Antonios Motakis |
Subject: |
[Qemu-devel] [PATCH v9 02/20] Add kvm_eventfds_enabled function |
Date: |
Tue, 4 Mar 2014 19:22:45 +0100 |
Add a function to check if the eventfd capability is present in KVM in
the host kernel.
Signed-off-by: Antonios Motakis <address@hidden>
Signed-off-by: Nikolay Nikolaev <address@hidden>
---
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 a02d67c..3db063e 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 fd8157a..85f31b4 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -110,6 +110,7 @@ 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;
@@ -1505,6 +1506,9 @@ int kvm_init(void)
(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 e979f76..a25cda2 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;
--
1.8.3.2
- Re: [Qemu-devel] [PATCH v9 10/20] Gracefully handle ioctl failure in vhost_virtqueue_stop, (continued)
[Qemu-devel] [PATCH v9 05/20] Add chardev API qemu_chr_fe_get_msgfds, Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 03/20] Add chardev API qemu_chr_fe_read_all, Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 17/20] Add the vhost-user netdev backend to the command line, Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 19/20] libqemustub: add stubs to be able to use qemu-char.c, Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 20/20] Add qtest for vhost-user, Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 02/20] Add kvm_eventfds_enabled function,
Antonios Motakis <=
[Qemu-devel] [PATCH v9 09/20] Add new virtio API virtio_queue_get_avail_idx, Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 16/20] Add new vhost-user netdev backend, Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 15/20] Add vhost-user as a vhost backend., Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 11/20] vhost_net_init will use VhostNetOptions to get all its arguments, Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 13/20] Add mandatory_features to vhost_dev, Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 18/20] Add vhost-user protocol documentation, Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 04/20] Add chardev API qemu_chr_fe_set_msgfds, Antonios Motakis, 2014/03/04
[Qemu-devel] [PATCH v9 14/20] Add vhost-backend and VhostBackendType, Antonios Motakis, 2014/03/04