KVM: PPC: Book3S: Add support for ibm,int-on/off RTAS calls
This adds support for the ibm,int-on and ibm,int-off RTAS calls to the
in-kernel XICS emulation and corrects the handling of the saved
priority by the ibm,set-xive RTAS call. With this, ibm,int-off sets
the specified interrupt's priority in its saved_priority field and
sets the priority to 0xff (the least favoured value). ibm,int-on
restores the saved_priority to the priority field, and ibm,set-xive
sets both the priority and the saved_priority to the specified
priority value.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/arch/powerpc/kvm/book3s_xics.c b/arch/powerpc/kvm/book3s_xics.c
index 7fd247c..9fb2d39 100644
--- a/arch/powerpc/kvm/book3s_xics.c
+++ b/arch/powerpc/kvm/book3s_xics.c
@@ -123,6 +123,28 @@
mutex_unlock(&ics->lock);
}
+static bool write_xive(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
+ struct ics_irq_state *state,
+ u32 server, u32 priority, u32 saved_priority)
+{
+ bool deliver;
+
+ mutex_lock(&ics->lock);
+
+ state->server = server;
+ state->priority = priority;
+ state->saved_priority = saved_priority;
+ deliver = false;
+ if ((state->masked_pending || state->resend) && priority != MASKED) {
+ state->masked_pending = 0;
+ deliver = true;
+ }
+
+ mutex_unlock(&ics->lock);
+
+ return deliver;
+}
+
int kvmppc_xics_set_xive(struct kvm *kvm, u32 irq, u32 server, u32 priority)
{
struct kvmppc_xics *xics = kvm->arch.xics;
@@ -130,7 +152,6 @@
struct kvmppc_ics *ics;
struct ics_irq_state *state;
u16 src;
- bool deliver;
if (!xics)
return -ENODEV;
@@ -144,23 +165,11 @@
if (!icp)
return -EINVAL;
- mutex_lock(&ics->lock);
-
XICS_DBG("set_xive %#x server %#x prio %#x MP:%d RS:%d\n",
irq, server, priority,
state->masked_pending, state->resend);
- state->server = server;
- state->priority = priority;
- deliver = false;
- if ((state->masked_pending || state->resend) && priority != MASKED) {
- state->masked_pending = 0;
- deliver = true;
- }
-
- mutex_unlock(&ics->lock);
-
- if (deliver)
+ if (write_xive(xics, ics, state, server, priority, priority))
icp_deliver_irq(xics, icp, irq);
return 0;
@@ -189,6 +198,53 @@
return 0;
}
+int kvmppc_xics_int_on(struct kvm *kvm, u32 irq)
+{
+ struct kvmppc_xics *xics = kvm->arch.xics;
+ struct kvmppc_icp *icp;
+ struct kvmppc_ics *ics;
+ struct ics_irq_state *state;
+ u16 src;
+
+ if (!xics)
+ return -ENODEV;
+
+ ics = kvmppc_xics_find_ics(xics, irq, &src);
+ if (!ics)
+ return -EINVAL;
+ state = &ics->irq_state[src];
+
+ icp = kvmppc_xics_find_server(kvm, state->server);
+ if (!icp)
+ return -EINVAL;
+
+ if (write_xive(xics, ics, state, state->server, state->saved_priority,
+ state->saved_priority))
+ icp_deliver_irq(xics, icp, irq);
+
+ return 0;
+}
+
+int kvmppc_xics_int_off(struct kvm *kvm, u32 irq)
+{
+ struct kvmppc_xics *xics = kvm->arch.xics;
+ struct kvmppc_ics *ics;
+ struct ics_irq_state *state;
+ u16 src;
+
+ if (!xics)
+ return -ENODEV;
+
+ ics = kvmppc_xics_find_ics(xics, irq, &src);
+ if (!ics)
+ return -EINVAL;
+ state = &ics->irq_state[src];
+
+ write_xive(xics, ics, state, state->server, MASKED, state->priority);
+
+ return 0;
+}
+
/* -- ICP routines, including hcalls -- */
static inline bool icp_try_update(struct kvmppc_icp *icp,