[Qemu-devel] [PATCH] kvm: add set_one_reg/get_one_reg

[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>
---
 include/sysemu/kvm.h |  4 ++++
 kvm-all.c            | 31 +++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index c7bc07b..b2d61e9 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -319,4 +319,8 @@ int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n, int virq);
 void kvm_pc_gsi_handler(void *opaque, int n, int level);
 void kvm_pc_setup_irq_routing(bool pci_enabled);
 void kvm_init_irq_routing(KVMState *s);
+
+int kvm_set_one_reg(CPUState *cs, uint64_t id, void *addr);
+int kvm_get_one_reg(CPUState *cs, uint64_t id, void *addr);
+
 #endif
diff --git a/kvm-all.c b/kvm-all.c
index ded7fc8..c24ab76 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -34,6 +34,7 @@
 #include "exec/address-spaces.h"
 #include "qemu/event_notifier.h"
 #include "trace.h"
+#include "qemu/error-report.h"
 
 /* This check must be after config-host.h is included */
 #ifdef CONFIG_EVENTFD
@@ -2049,3 +2050,33 @@ int kvm_on_sigbus(int code, void *addr)
 {
     return kvm_arch_on_sigbus(code, addr);
 }
+
+int kvm_set_one_reg(CPUState *cs, uint64_t id, void *addr)
+{
+    struct kvm_one_reg reg = {
+        .id = id,
+        .addr = (uintptr_t)addr,
+    };
+    int ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
+
+    if (ret) {
+        error_report("Unable to set reg#0x%"PRIx64" to KVM: %m\n", id);
+    }
+
+    return ret;
+}
+
+int kvm_get_one_reg(CPUState *cs, uint64_t id, void *addr)
+{
+    struct kvm_one_reg reg = {
+        .id = id,
+        .addr = (uintptr_t)addr,
+    };
+    int ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
+
+    if (ret) {
+        error_report("Unable to get reg#0x%"PRIx64" from KVM: %m\n", id);
+    }
+
+    return ret;
+}
-- 
1.8.4.rc4