[PATCH] qemu-kvm: Fix guest single-stepping

[Jan Kiszka <jan.kiszka@siemens.com>]

Hopefully the last regression of 4c0960c0: KVM_SET_GUEST_DEBUG requires
properly synchronized guest registers (on x86: eflags) on entry.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

 qemu-kvm.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/qemu-kvm.c b/qemu-kvm.c
index 78eeb6f..569397e 100644
--- a/qemu-kvm.c
+++ b/qemu-kvm.c
@@ -2282,6 +2282,10 @@ static void kvm_invoke_set_guest_debug(void *data)
 {
     struct kvm_set_guest_debug_data *dbg_data = data;
 
+    if (cpu_single_env->kvm_cpu_state.regs_modified) {
+        kvm_arch_put_registers(cpu_single_env);
+        cpu_single_env->kvm_cpu_state.regs_modified = 0;
+    }
     dbg_data->err =
         kvm_set_guest_debug(cpu_single_env->kvm_cpu_state.vcpu_ctx,
                             &dbg_data->dbg);