[Qemu-devel] [PATCH 1/5] s390x/cpu: Use ioctl to reset state in the kernel

[Christian Borntraeger <borntraeger@de.ibm.com>]

From: Thomas Huth <thuth@linux.vnet.ibm.com>

Some of the state in the kernel can not be reset from QEMU yet.
For this we've got to use the KVM_S390_INITIAL_RESET ioctl to make
sure that the state in the kernel is set to the right values during
initial CPU reset, too.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
 target-s390x/cpu.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c
index f1319e5..1a8c1cc 100644
--- a/target-s390x/cpu.c
+++ b/target-s390x/cpu.c
@@ -108,6 +108,15 @@ static void s390_cpu_initial_reset(CPUState *s)
     env->cregs[14] = CR14_RESET;
 
     env->pfault_token = -1UL;
+
+#if defined(CONFIG_KVM)
+    /* Reset state inside the kernel that we cannot access yet from QEMU. */
+    if (kvm_enabled()) {
+        if (kvm_vcpu_ioctl(s, KVM_S390_INITIAL_RESET, NULL)) {
+            perror("Initial CPU reset failed");
+        }
+    }
+#endif
 }
 
 /* CPUClass:reset() */
-- 
1.8.4.2