arch: AArch64: add a field gicr_typers for GIC implementations

The value of GIC register `GICR_TYPER` is needed in restoring
the GIC states. This commit adds a field in the GIC device struct
and a method to construct its value.

Signed-off-by: Henry Wang <Henry.Wang@arm.com>

arch/src/aarch64/gic/gicv2.rs

@@ -8,6 +8,7 @@ pub mod kvm {
     type Result<T> = result::Result<T, Error>;
     use crate::layout;
     use hypervisor::kvm::kvm_bindings;
+    use std::convert::TryInto;
     use std::sync::Arc;
 
     /// Represent a GIC v2 device
@@ -15,6 +16,11 @@ pub mod kvm {
         /// The hypervisor agnostic device
         device: Arc<dyn hypervisor::Device>,
 
+        /// Vector holding values of GICR_TYPER for each vCPU
+        /// As GICv2 does not have redistributor, this field is always
+        /// a zero vector.
+        gicr_typers: Vec<u64>,
+
         /// GIC device properties, to be used for setting up the fdt entry
         properties: [u64; 4],
 
@@ -72,6 +78,10 @@ pub mod kvm {
         fn vcpu_count(&self) -> u64 {
             self.vcpu_count
         }
+
+        fn set_gicr_typers(&mut self, gicr_typers: Vec<u64>) {
+            self.gicr_typers = gicr_typers;
+        }
     }
 
     impl KvmGICDevice for KvmGICv2 {
@@ -85,6 +95,7 @@ pub mod kvm {
         ) -> Box<dyn GICDevice> {
             Box::new(KvmGICv2 {
                 device,
+                gicr_typers: vec![0; vcpu_count.try_into().unwrap()],
                 properties: [
                     KvmGICv2::get_dist_addr(),
                     KvmGICv2::get_dist_size(),

arch/src/aarch64/gic/gicv3.rs

@@ -6,6 +6,7 @@ pub mod kvm {
     use crate::aarch64::gic::{Error, GICDevice};
     use crate::layout;
     use hypervisor::kvm::kvm_bindings;
+    use std::convert::TryInto;
     use std::sync::Arc;
     use std::{boxed::Box, result};
     type Result<T> = result::Result<T, Error>;
@@ -14,6 +15,9 @@ pub mod kvm {
         /// The hypervisor agnostic device
         device: Arc<dyn hypervisor::Device>,
 
+        /// Vector holding values of GICR_TYPER for each vCPU
+        gicr_typers: Vec<u64>,
+
         /// GIC device properties, to be used for setting up the fdt entry
         properties: [u64; 4],
 
@@ -72,6 +76,10 @@ pub mod kvm {
         fn vcpu_count(&self) -> u64 {
             self.vcpu_count
         }
+
+        fn set_gicr_typers(&mut self, gicr_typers: Vec<u64>) {
+            self.gicr_typers = gicr_typers;
+        }
     }
 
     impl KvmGICDevice for KvmGICv3 {
@@ -85,6 +93,7 @@ pub mod kvm {
         ) -> Box<dyn GICDevice> {
             Box::new(KvmGICv3 {
                 device,
+                gicr_typers: vec![0; vcpu_count.try_into().unwrap()],
                 properties: [
                     KvmGICv3::get_dist_addr(),
                     KvmGICv3::get_dist_size(),

arch/src/aarch64/gic/gicv3_its.rs

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 pub mod kvm {
+    use std::convert::TryInto;
     use std::sync::Arc;
     use std::{boxed::Box, result};
     type Result<T> = result::Result<T, Error>;
@@ -14,6 +15,9 @@ pub mod kvm {
         /// The hypervisor agnostic device
         device: Arc<dyn hypervisor::Device>,
 
+        /// Vector holding values of GICR_TYPER for each vCPU
+        gicr_typers: Vec<u64>,
+
         /// GIC device properties, to be used for setting up the fdt entry
         gic_properties: [u64; 4],
 
@@ -68,6 +72,10 @@ pub mod kvm {
         fn vcpu_count(&self) -> u64 {
             self.vcpu_count
         }
+
+        fn set_gicr_typers(&mut self, gicr_typers: Vec<u64>) {
+            self.gicr_typers = gicr_typers;
+        }
     }
 
     impl KvmGICDevice for KvmGICv3ITS {
@@ -81,6 +89,7 @@ pub mod kvm {
         ) -> Box<dyn GICDevice> {
             Box::new(KvmGICv3ITS {
                 device,
+                gicr_typers: vec![0; vcpu_count.try_into().unwrap()],
                 gic_properties: [
                     KvmGICv3::get_dist_addr(),
                     KvmGICv3::get_dist_size(),

arch/src/aarch64/gic/mod.rs

@@ -56,6 +56,9 @@ pub trait GICDevice: Send {
     fn msi_properties(&self) -> &[u64] {
         &[]
     }
+
+    /// Get the values of GICR_TYPER for each vCPU.
+    fn set_gicr_typers(&mut self, gicr_typers: Vec<u64>);
 }
 
 pub mod kvm {