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Add kvm_eventfds_enabled function 

Add a function to check if the eventfd capability is present in KVM in
the host kernel.

Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nikolay Nikolaev 2014-05-27 15:03:35 +03:00 committed by Michael S. Tsirkin
parent f57fcf7063
commit 69e03ae64b
3 changed files with 16 additions and 0 deletions
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11
include/sysemu/kvm.h
View File

@ -43,6 +43,7 @@ extern bool kvm_allowed;
extern bool kvm_kernel_irqchip; extern bool kvm_kernel_irqchip;
extern bool kvm_async_interrupts_allowed; extern bool kvm_async_interrupts_allowed;
extern bool kvm_halt_in_kernel_allowed; extern bool kvm_halt_in_kernel_allowed;
extern bool kvm_eventfds_allowed;
extern bool kvm_irqfds_allowed; extern bool kvm_irqfds_allowed;
extern bool kvm_msi_via_irqfd_allowed; extern bool kvm_msi_via_irqfd_allowed;
extern bool kvm_gsi_routing_allowed; extern bool kvm_gsi_routing_allowed;
@ -82,6 +83,15 @@ extern bool kvm_readonly_mem_allowed;
*/ */
#define kvm_halt_in_kernel() (kvm_halt_in_kernel_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: * kvm_irqfds_enabled:
* *
@ -128,6 +138,7 @@ extern bool kvm_readonly_mem_allowed;
#define kvm_irqchip_in_kernel() (false) #define kvm_irqchip_in_kernel() (false)
#define kvm_async_interrupts_enabled() (false) #define kvm_async_interrupts_enabled() (false)
#define kvm_halt_in_kernel() (false) #define kvm_halt_in_kernel() (false)
#define kvm_eventfds_enabled() (false)
#define kvm_irqfds_enabled() (false) #define kvm_irqfds_enabled() (false)
#define kvm_msi_via_irqfd_enabled() (false) #define kvm_msi_via_irqfd_enabled() (false)
#define kvm_gsi_routing_allowed() (false) #define kvm_gsi_routing_allowed() (false)

4
kvm-all.c
View File

@ -113,6 +113,7 @@ KVMState *kvm_state;
bool kvm_kernel_irqchip; bool kvm_kernel_irqchip;
bool kvm_async_interrupts_allowed; bool kvm_async_interrupts_allowed;
bool kvm_halt_in_kernel_allowed; bool kvm_halt_in_kernel_allowed;
bool kvm_eventfds_allowed;
bool kvm_irqfds_allowed; bool kvm_irqfds_allowed;
bool kvm_msi_via_irqfd_allowed; bool kvm_msi_via_irqfd_allowed;
bool kvm_gsi_routing_allowed; bool kvm_gsi_routing_allowed;
@ -1541,6 +1542,9 @@ int kvm_init(MachineClass *mc)
(kvm_check_extension(s, KVM_CAP_READONLY_MEM) > 0); (kvm_check_extension(s, KVM_CAP_READONLY_MEM) > 0);
#endif #endif
kvm_eventfds_allowed =
(kvm_check_extension(s, KVM_CAP_IOEVENTFD) > 0);
ret = kvm_arch_init(s); ret = kvm_arch_init(s);
if (ret < 0) { if (ret < 0) {
goto err; goto err;

1
kvm-stub.c
View File

@ -22,6 +22,7 @@
KVMState *kvm_state; KVMState *kvm_state;
bool kvm_kernel_irqchip; bool kvm_kernel_irqchip;
bool kvm_async_interrupts_allowed; bool kvm_async_interrupts_allowed;
bool kvm_eventfds_allowed;
bool kvm_irqfds_allowed; bool kvm_irqfds_allowed;
bool kvm_msi_via_irqfd_allowed; bool kvm_msi_via_irqfd_allowed;
bool kvm_gsi_routing_allowed; bool kvm_gsi_routing_allowed;