KVM: PPC: BookE: Implement EPR exit
The External Proxy Facility in FSL BookE chips allows the interrupt
controller to automatically acknowledge an interrupt as soon as a
core gets its pending external interrupt delivered.
Today, user space implements the interrupt controller, so we need to
check on it during such a cycle.
This patch implements logic for user space to enable EPR exiting,
disable EPR exiting and EPR exiting itself, so that user space can
acknowledge an interrupt when an external interrupt has successfully
been delivered into the guest vcpu.
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index cbe0d68..4dd7d75 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -122,6 +122,7 @@
#define KVM_REQ_WATCHDOG 18
#define KVM_REQ_MASTERCLOCK_UPDATE 19
#define KVM_REQ_MCLOCK_INPROGRESS 20
+#define KVM_REQ_EPR_EXIT 21
#define KVM_USERSPACE_IRQ_SOURCE_ID 0
#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 8bb0bf8..9a2db57 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -169,6 +169,7 @@
#define KVM_EXIT_S390_UCONTROL 20
#define KVM_EXIT_WATCHDOG 21
#define KVM_EXIT_S390_TSCH 22
+#define KVM_EXIT_EPR 23
/* For KVM_EXIT_INTERNAL_ERROR */
/* Emulate instruction failed. */
@@ -295,6 +296,10 @@
__u32 ipb;
__u8 dequeued;
} s390_tsch;
+ /* KVM_EXIT_EPR */
+ struct {
+ __u32 epr;
+ } epr;
/* Fix the size of the union. */
char padding[256];
};
@@ -656,6 +661,7 @@
#define KVM_CAP_PPC_BOOKE_WATCHDOG 83
#define KVM_CAP_PPC_HTAB_FD 84
#define KVM_CAP_S390_CSS_SUPPORT 85
+#define KVM_CAP_PPC_EPR 86
#ifdef KVM_CAP_IRQ_ROUTING