diff options
| -rw-r--r-- | arch/mips/kvm/mips.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index 414b00074e29..a6ea084b4d9d 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -300,6 +300,18 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n", ALIGN(size, PAGE_SIZE), gebase); + /* + * Check new ebase actually fits in CP0_EBase. The lack of a write gate + * limits us to the low 512MB of physical address space. If the memory + * we allocate is out of range, just give up now. + */ + if (!cpu_has_ebase_wg && virt_to_phys(gebase) >= 0x20000000) { + kvm_err("CP0_EBase.WG required for guest exception base %pK\n", + gebase); + err = -ENOMEM; + goto out_free_gebase; + } + /* Save new ebase */ vcpu->arch.guest_ebase = gebase; |