[RFC PATCH v3 05/19] target/arm/kvm: enable writable implementation ID registers

Enable KVM_CAP_ARM_WRITABLE_IMP_ID_REGS if the host kernel supports it.
This allows QEMU to write implementation-defined ID registers (MIDR,
REVIDR) so that named CPU models can present the correct values to the
guest instead of inheriting the host's identity.

Signed-off-by: Khushit Shah <[email protected]>
---
 target/arm/kvm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index 76583db3f0..63b3727e05 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -741,6 +741,13 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
         }
     }
 
+    if (kvm_check_extension(s, KVM_CAP_ARM_WRITABLE_IMP_ID_REGS)) {
+        if (kvm_vm_enable_cap(s, KVM_CAP_ARM_WRITABLE_IMP_ID_REGS, 0)) {
+            error_report("Failed to enable "
+                         "KVM_CAP_ARM_WRITABLE_IMP_ID_REGS cap");
+        }
+    }
+
     if (s->kvm_eager_split_size) {
         uint32_t sizes;
 
-- 
2.52.0