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[Qemu-devel] [PULL v2 043/106] Add kvm_eventfds_enabled function
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL v2 043/106] Add kvm_eventfds_enabled function |
Date: |
Wed, 18 Jun 2014 19:18:13 +0300 |
From: Nikolay Nikolaev <address@hidden>
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>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
Acked-by: Paolo Bonzini <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 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
- [Qemu-devel] [PULL v2 018/106] pc-dimm: add busy slot check and slot auto-allocation, (continued)
- [Qemu-devel] [PULL v2 018/106] pc-dimm: add busy slot check and slot auto-allocation, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 021/106] trace: add acpi memory hotplug IO region events, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 022/106] trace: pc: add PC_DIMM slot & address allocation, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 023/106] acpi:piix4: allow plug/unlug callbacks handle not only PCI devices, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 025/106] pc: ich9 lpc: make it work with global/compat properties, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 024/106] acpi:piix4: add memory hotplug handling, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 026/106] acpi:ich9: add memory hotplug handling, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 027/106] pc: migrate piix4 & ich9 MemHotplugState, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 033/106] pc: ACPI BIOS: make GPE.3 handle memory hotplug event on PIIX and Q35 machines, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 042/106] virtio-net: announce self by guest, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 043/106] Add kvm_eventfds_enabled function,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL v2 044/106] Add chardev API qemu_chr_fe_read_all, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 045/106] Add chardev API qemu_chr_fe_set_msgfds, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 046/106] Add chardev API qemu_chr_fe_get_msgfds, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 052/106] Add vhost_ops to vhost_dev struct and replace all relevant ioctls, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 053/106] Add vhost-backend and VhostBackendType, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 054/106] Add vhost-user as a vhost backend., Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 055/106] vhost-net: vhost-user feature bits support, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 056/106] Add new vhost-user netdev backend, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 057/106] Add the vhost-user netdev backend to the command line, Michael S. Tsirkin, 2014/06/18
- [Qemu-devel] [PULL v2 058/106] Add vhost-user protocol documentation, Michael S. Tsirkin, 2014/06/18