[patch uq/master 8/9] kvm: validate context for kvm cpu get/put operations

[Marcelo Tosatti <mtosatti@xxxxxxxxxx>]

From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>

Validate that KVM vcpu state is only read/written from cpu thread itself
or that cpu is stopped.

Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

Index: qemu/target-i386/kvm.c
===================================================================
--- qemu.orig/target-i386/kvm.c
+++ qemu/target-i386/kvm.c
@@ -949,6 +949,8 @@ int kvm_arch_put_registers(CPUState *env
 {
     int ret;
 
+    assert(cpu_is_stopped(env) || qemu_cpu_self(env));
+
     ret = kvm_getput_regs(env, 1);
     if (ret < 0)
         return ret;
@@ -991,6 +993,8 @@ int kvm_arch_get_registers(CPUState *env
 {
     int ret;
 
+    assert(cpu_is_stopped(env) || qemu_cpu_self(env));
+
     ret = kvm_getput_regs(env, 0);
     if (ret < 0)
         return ret;


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