@@ -10,6 +10,7 @@
#include <linux/kernel.h>
#include <linux/kvm_host.h>
#include <linux/err.h>
+#include <linux/kernel_stat.h>
#include <asm/kvm_book3s.h>
#include <asm/kvm_ppc.h>
@@ -18,6 +19,7 @@
#include <asm/debug.h>
#include <asm/synch.h>
#include <asm/cputhreads.h>
+#include <asm/pgtable.h>
#include <asm/ppc-opcode.h>
#include <asm/pnv-pci.h>
@@ -734,6 +736,53 @@ static void icp_eoi(struct irq_chip *c, u32 hwirq, u32 xirr)
_stwcix(xics_phys + XICS_XIRR, xirr);
}
+/*
+ * Increment a per-CPU 32-bit unsigned integer variable.
+ * Safe to call in real-mode. Handles vmalloc'ed addresses
+ *
+ * ToDo: Make this work for any integral type
+ */
+
+static inline void this_cpu_inc_rm(unsigned int __percpu *addr)
+{
+ unsigned long l;
+ unsigned int *raddr;
+ int cpu = smp_processor_id();
+
+ raddr = per_cpu_ptr(addr, cpu);
+ l = (unsigned long)raddr;
+
+ if (REGION_ID(l) == VMALLOC_REGION_ID) {
+ l = vmalloc_to_phys(raddr);
+ raddr = (unsigned int *)l;
+ }
+ ++*raddr;
+}
+
+/*
+ * We don't try to update the flags in the irq_desc 'istate' field in
+ * here as would happen in the normal IRQ handling path for several reasons:
+ * - state flags represent internal IRQ state and are not expected to be
+ * updated outside the IRQ subsystem
+ * - more importantly, these are useful for edge triggered interrupts,
+ * IRQ probing, etc., but we are only handling MSI/MSIx interrupts here
+ * and these states shouldn't apply to us.
+ *
+ * However, we do update irq_stats - we somewhat duplicate the code in
+ * kstat_incr_irqs_this_cpu() for this since this function is defined
+ * in irq/internal.h which we don't want to include here.
+ * The only difference is that desc->kstat_irqs is an allocated per CPU
+ * variable and could have been vmalloc'ed, so we can't directly
+ * call __this_cpu_inc() on it. The kstat structure is a static
+ * per CPU variable and it should be accessible by real-mode KVM.
+ *
+ */
+static void kvmppc_rm_handle_irq_desc(struct irq_desc *desc)
+{
+ this_cpu_inc_rm(desc->kstat_irqs);
+ __this_cpu_inc(kstat.irqs_sum);
+}
+
long kvmppc_deliver_irq_passthru(struct kvm_vcpu *vcpu,
u32 xirr,
struct kvmppc_irq_map *irq_map,
@@ -747,6 +796,7 @@ long kvmppc_deliver_irq_passthru(struct kvm_vcpu *vcpu,
xics = vcpu->kvm->arch.xics;
icp = vcpu->arch.icp;
+ kvmppc_rm_handle_irq_desc(irq_map->desc);
icp_rm_deliver_irq(xics, icp, irq);
/* EOI the interrupt */