[Qemu-devel] [PULL 2/8] kvm: add set_one_reg/get_one_reg helpers

[Paolo Bonzini <pbonzini@redhat.com>]

From: Alexey Kardashevskiy <aik@ozlabs.ru>

This adds QEMU wrappers for KVM_SET_ONE_REG/KVM_GET_ONE_REG ioctls.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 include/sysemu/kvm.h | 20 ++++++++++++++++++++
 kvm-all.c            | 18 ++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 0bee1e8..84a4f40 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -343,6 +343,26 @@ void kvm_pc_setup_irq_routing(bool pci_enabled);
 void kvm_init_irq_routing(KVMState *s);
 
 /**
+ * kvm_set_one_reg - set a register value in KVM via KVM_SET_ONE_REG ioctl
+ * @id: The register ID
+ * @addr: The pointer to a value must point to a variable of the correct
+ * type/size for the register being accessed.
+ *
+ * Returns: 0 on success, or a negative errno on failure.
+ */
+int kvm_set_one_reg(CPUState *cs, uint64_t id, void *addr);
+
+/**
+ * kvm_get_one_reg - get a register value from KVM via KVM_GET_ONE_REG ioctl
+ * @id: The register ID
+ * @addr: The pointer to a value must point to a variable of the correct
+ * type/size for the register being accessed.
+ *
+ * Returns: 0 on success, or a negative errno on failure.
+ */
+int kvm_get_one_reg(CPUState *cs, uint64_t id, void *addr);
+
+/**
  * kvm_arch_irqchip_create:
  * @KVMState: The KVMState pointer
  *
diff --git a/kvm-all.c b/kvm-all.c
index 82a9119..724c423 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -2114,3 +2114,21 @@ int kvm_create_device(KVMState *s, uint64_t type, bool test)
 
     return test ? 0 : create_dev.fd;
 }
+
+int kvm_set_one_reg(CPUState *cs, uint64_t id, void *addr)
+{
+    struct kvm_one_reg reg = {
+        .id = id,
+        .addr = (uintptr_t)addr,
+    };
+    return kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
+}
+
+int kvm_get_one_reg(CPUState *cs, uint64_t id, void *addr)
+{
+    struct kvm_one_reg reg = {
+        .id = id,
+        .addr = (uintptr_t)addr,
+    };
+    return kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
+}
-- 
1.8.3.1