[PATCH v1 11/17] xen/riscv: add vAPLIC state save/restore hooks

vAPLIC state needs to be saved and restored as part of vCPU context
management.

Introduce vaplic_state_save() and vaplic_state_restore() and wire them
to the IMSIC state save/restore helpers when MSI is available. The
functions are currently no-ops on platforms without MSI support and
will lead to BUG_ON() to not miss add support of no-MSI case.

Co-developed-by: Romain Caritey <[email protected]>
Signed-off-by: Oleksii Kurochko <[email protected]>
---
 xen/arch/riscv/include/asm/vaplic.h |  3 +++
 xen/arch/riscv/vaplic.c             | 18 ++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/xen/arch/riscv/include/asm/vaplic.h b/xen/arch/riscv/include/asm/vaplic.h
index 7bf9247f4eae..fbd224b9a34a 100644
--- a/xen/arch/riscv/include/asm/vaplic.h
+++ b/xen/arch/riscv/include/asm/vaplic.h
@@ -34,4 +34,7 @@ struct vaplic {
 int domain_vaplic_init(struct domain *d);
 void domain_vaplic_deinit(struct domain *d);
 
+void vaplic_state_save(struct vcpu *v);
+void vaplic_state_restore(struct vcpu *v);
+
 #endif /* ASM__RISCV__VAPLIC_H */
diff --git a/xen/arch/riscv/vaplic.c b/xen/arch/riscv/vaplic.c
index 03240730e344..0723aad9558e 100644
--- a/xen/arch/riscv/vaplic.c
+++ b/xen/arch/riscv/vaplic.c
@@ -400,9 +400,27 @@ static const struct mmio_handler_ops vaplic_mmio_ops = {
     .write = vaplic_mmio_write,
 };
 
+void vaplic_state_save(struct vcpu *v)
+{
+    if ( has_msi_support() )
+        imsic_state_save(v);
+    else
+        BUG_ON("unimplemented");
+}
+
+void vaplic_state_restore(struct vcpu *v)
+{
+    if ( has_msi_support() )
+        imsic_state_restore(v);
+    else
+        BUG_ON("unimplemented");
+}
+
 static const struct vintc_ops vintc_ops = {
     .vcpu_init = vaplic_init,
     .vcpu_deinit = vaplic_deinit,
+    .store_state = vaplic_state_save,
+    .restore_state = vaplic_state_restore,
 };
 
 int domain_vaplic_init(struct domain *d)
-- 
2.54.0