KVM: PPC: Book3S HV: Introduce kvmppc_passthru_irqmap

This patch introduces an IRQ mapping structure, the
kvmppc_passthru_irqmap structure that is to be used
to map the real hardware IRQ in the host with the virtual
hardware IRQ (gsi) that is injected into a guest by KVM for
passthrough adapters.

Currently, we assume a separate IRQ mapping structure for
each guest. Each kvmppc_passthru_irqmap has a mapping arrays,
containing all defined real<->virtual IRQs.

[paulus@ozlabs.org - removed irq_chip field from struct
 kvmppc_passthru_irqmap; changed parameter for
 kvmppc_get_passthru_irqmap from struct kvm_vcpu * to struct
 kvm *, removed small cached array.]

Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

3 files changed, 44 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 373003f4551d..89ac1f6c2cb2 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -203,6 +203,8 @@ struct kvmppc_spapr_tce_table {
 struct kvmppc_xics;
 struct kvmppc_icp;
 
+struct kvmppc_passthru_irqmap;
+
 /*
  * The reverse mapping array has one entry for each HPTE,
  * which stores the guest's view of the second word of the HPTE
@@ -273,6 +275,7 @@ struct kvm_arch {
 #endif
 #ifdef CONFIG_KVM_XICS
         struct kvmppc_xics *xics;
+        struct kvmppc_passthru_irqmap *pimap;
 #endif
         struct kvmppc_ops *kvm_ops;
 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
@@ -369,6 +372,20 @@ struct kvmhv_tb_accumulator {
         u64     tb_max;         /* max time */
 };
 
+#ifdef CONFIG_PPC_BOOK3S_64
+struct kvmppc_irq_map {
+        u32     r_hwirq;
+        u32     v_hwirq;
+        struct irq_desc *desc;
+};
+
+#define KVMPPC_PIRQ_MAPPED      1024
+struct kvmppc_passthru_irqmap {
+        int n_mapped;
+        struct kvmppc_irq_map mapped[KVMPPC_PIRQ_MAPPED];
+};
+#endif
+
 # ifdef CONFIG_PPC_FSL_BOOK3E
 #define KVMPPC_BOOKE_IAC_NUM    2
 #define KVMPPC_BOOKE_DAC_NUM    2
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 94715e22d6a2..4ca2ba36a860 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -457,8 +457,18 @@ static inline int kvmppc_xics_enabled(struct kvm_vcpu *vcpu)
 {
         return vcpu->arch.irq_type == KVMPPC_IRQ_XICS;
 }
+
+static inline struct kvmppc_passthru_irqmap *kvmppc_get_passthru_irqmap(
+                                struct kvm *kvm)
+{
+        if (kvm)
+                return kvm->arch.pimap;
+        return NULL;
+}
+
 extern void kvmppc_alloc_host_rm_ops(void);
 extern void kvmppc_free_host_rm_ops(void);
+extern void kvmppc_free_pimap(struct kvm *kvm);
 extern void kvmppc_xics_free_icp(struct kvm_vcpu *vcpu);
 extern int kvmppc_xics_create_icp(struct kvm_vcpu *vcpu, unsigned long server);
 extern int kvm_vm_ioctl_xics_irq(struct kvm *kvm, struct kvm_irq_level *args);
@@ -470,8 +480,12 @@ extern int kvmppc_xics_connect_vcpu(struct kvm_device *dev,
 extern void kvmppc_xics_ipi_action(void);
 extern int h_ipi_redirect;
 #else
+static inline struct kvmppc_passthru_irqmap *kvmppc_get_passthru_irqmap(
+                                struct kvm *kvm)
+        { return NULL; }
 static inline void kvmppc_alloc_host_rm_ops(void) {};
 static inline void kvmppc_free_host_rm_ops(void) {};
+static inline void kvmppc_free_pimap(struct kvm *kvm) {};
 static inline int kvmppc_xics_enabled(struct kvm_vcpu *vcpu)
         { return 0; }
 static inline void kvmppc_xics_free_icp(struct kvm_vcpu *vcpu) { }
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 30ff8ab5aba1..d5c7061b9045 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -3412,6 +3412,19 @@ static int kvmppc_core_check_processor_compat_hv(void)
         return 0;
 }
 
+#ifdef CONFIG_KVM_XICS
+
+void kvmppc_free_pimap(struct kvm *kvm)
+{
+        kfree(kvm->arch.pimap);
+}
+
+struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void)
+{
+        return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL);
+}
+#endif
+
 static long kvm_arch_vm_ioctl_hv(struct file *filp,
                                  unsigned int ioctl, unsigned long arg)
 {