diff options
| -rw-r--r-- | arch/x86/kvm/x86.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 1ab0caa97f30..833300fc78e3 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -10783,6 +10783,16 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) unsigned long new_cr0; u32 eax, dummy; + /* + * Several of the "set" flows, e.g. ->set_cr0(), read other registers + * to handle side effects. RESET emulation hits those flows and relies + * on emulated/virtualized registers, including those that are loaded + * into hardware, to be zeroed at vCPU creation. Use CRs as a sentinel + * to detect improper or missing initialization. + */ + WARN_ON_ONCE(!init_event && + (old_cr0 || kvm_read_cr3(vcpu) || kvm_read_cr4(vcpu))); + kvm_lapic_reset(vcpu, init_event); vcpu->arch.hflags = 0; |