diff options
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 2078f92..fc7bc71 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -1200,6 +1200,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { + __u32 fpc; + save_fp_ctl(&vcpu->arch.host_fpregs.fpc); if (test_kvm_facility(vcpu->kvm, 129)) save_vx_regs((__vector128 *)&vcpu->arch.host_vregs->vrs); @@ -1207,12 +1209,16 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) save_fp_regs(vcpu->arch.host_fpregs.fprs); save_access_regs(vcpu->arch.host_acrs); if (test_kvm_facility(vcpu->kvm, 129)) { - restore_fp_ctl(&vcpu->run->s.regs.fpc); + fpc = vcpu->run->s.regs.fpc; restore_vx_regs((__vector128 *)&vcpu->run->s.regs.vrs); } else { - restore_fp_ctl(&vcpu->arch.guest_fpregs.fpc); + fpc = vcpu->arch.guest_fpregs.fpc; restore_fp_regs(vcpu->arch.guest_fpregs.fprs); } + if (test_fp_ctl(fpc)) + /* User space provided an invalid FPC, let's clear it */ + fpc = 0; + restore_fp_ctl(&fpc); restore_access_regs(vcpu->run->s.regs.acrs); gmap_enable(vcpu->arch.gmap); atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); |