[PATCH v4 18/25] xen/riscv: introduce (de)initialization helpers for vINTC

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Add common helpers domain_vintc_init() and domain_vintc_deinit() to
allocate and deallocate a virtual interrupt controller (vINTC)
structure and initialize basic virtual interrupt controller registers.

domain_vintc_deinit() isn't called at the moment as arch_domain_destroy()
is implemented as stub at the moment.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in v4:
 - Drop the comment from domain_vintc_init() about guests receiving a
   virtual interrupt controller that mirrors the host hardware as there
   can (and eventually should) be alternatives.
 - Finish renaming intc_version to intc_variant in domain_vintc_(de)init()
   (enum intc_variant, info->hw_variant, local variable) started in the
   prev patch.
---
Changes in v3:
 - Drop redundant printk() from domain_vintc_deinit()'s default case to
   avoid duplicate messages when init fails.
 - Add a comment to domain_vintc_init() clarifying that guests currently
   receive a virtual interrupt controller that mirrors the host hardware.
---
Changes in v2:
 - Drop __init for domain_vintc_(de)init().
 - Update the commit message.
---
---
 xen/arch/riscv/domain.c           |  3 +++
 xen/arch/riscv/include/asm/intc.h |  3 +++
 xen/arch/riscv/intc.c             | 35 +++++++++++++++++++++++++++++++
 3 files changed, 41 insertions(+)

diff --git a/xen/arch/riscv/domain.c b/xen/arch/riscv/domain.c
index 129e775c52cb..3499c25dcfe0 100644
--- a/xen/arch/riscv/domain.c
+++ b/xen/arch/riscv/domain.c
@@ -309,6 +309,9 @@ int arch_domain_create(struct domain *d,
     if ( (rc = p2m_init(d, config)) != 0)
         goto fail;
 
+    if ( (rc = domain_vintc_init(d)) )
+        goto fail;
+
     return rc;
 
  fail:
diff --git a/xen/arch/riscv/include/asm/intc.h 
b/xen/arch/riscv/include/asm/intc.h
index f7d42aa9fc40..62260155dc6b 100644
--- a/xen/arch/riscv/include/asm/intc.h
+++ b/xen/arch/riscv/include/asm/intc.h
@@ -75,4 +75,7 @@ void intc_route_irq_to_xen(struct irq_desc *desc, unsigned 
int priority);
 
 void intc_handle_external_irqs(struct cpu_user_regs *regs);
 
+int domain_vintc_init(struct domain *d);
+void domain_vintc_deinit(struct domain *d);
+
 #endif /* ASM__RISCV__INTERRUPT_CONTOLLER_H */
diff --git a/xen/arch/riscv/intc.c b/xen/arch/riscv/intc.c
index 2864a896b677..0eb7eb924e9c 100644
--- a/xen/arch/riscv/intc.c
+++ b/xen/arch/riscv/intc.c
@@ -11,6 +11,7 @@
 
 #include <asm/aia.h>
 #include <asm/intc.h>
+#include <asm/vaplic.h>
 
 static const struct intc_hw_operations *__ro_after_init intc_hw_ops;
 
@@ -83,3 +84,37 @@ int __init make_intc_domU_node(struct kernel_info *kinfo)
 
     return vintc->init_ops->make_domu_dt_node(kinfo);
 }
+
+int domain_vintc_init(struct domain *d)
+{
+    int ret = -EOPNOTSUPP;
+    const enum intc_variant variant = intc_hw_ops->info->hw_variant;
+
+    switch ( variant )
+    {
+    case INTC_APLIC:
+        ret = domain_vaplic_init(d);
+        break;
+
+    default:
+        printk("vintc (variant:%d) isn't implemented\n", variant);
+        break;
+    }
+
+    return ret;
+}
+
+void domain_vintc_deinit(struct domain *d)
+{
+    const enum intc_variant variant = intc_hw_ops->info->hw_variant;
+
+    switch ( variant )
+    {
+    case INTC_APLIC:
+        domain_vaplic_deinit(d);
+        break;
+
+    default:
+        break;
+    }
+}
-- 
2.54.0