*/
#define KVM_FEP_CLEAR_RFLAGS_RF BIT(1)
static int __read_mostly force_emulation_prefix;
-module_param(force_emulation_prefix, int, 0444);
+module_param(force_emulation_prefix, int, 0644);
int __read_mostly pi_inject_timer = -1;
module_param(pi_inject_timer, bint, S_IRUGO | S_IWUSR);
int handle_ud(struct kvm_vcpu *vcpu)
{
static const char kvm_emulate_prefix[] = { __KVM_EMULATE_PREFIX };
+ int fep_flags = READ_ONCE(force_emulation_prefix);
int emul_type = EMULTYPE_TRAP_UD;
char sig[5]; /* ud2; .ascii "kvm" */
struct x86_exception e;
if (unlikely(!kvm_can_emulate_insn(vcpu, emul_type, NULL, 0)))
return 1;
- if (force_emulation_prefix &&
+ if (fep_flags &&
kvm_read_guest_virt(vcpu, kvm_get_linear_rip(vcpu),
sig, sizeof(sig), &e) == 0 &&
memcmp(sig, kvm_emulate_prefix, sizeof(sig)) == 0) {
- if (force_emulation_prefix & KVM_FEP_CLEAR_RFLAGS_RF)
+ if (fep_flags & KVM_FEP_CLEAR_RFLAGS_RF)
kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) & ~X86_EFLAGS_RF);
kvm_rip_write(vcpu, kvm_rip_read(vcpu) + sizeof(sig));
emul_type = EMULTYPE_TRAP_UD_FORCED;