MIPS: KVM: Fail if ebase doesn't fit in CP0_EBase

Fail if the address of the allocated exception base doesn't fit into the
CP0_EBase register. This can happen on MIPS64 if CP0_EBase.WG isn't
implemented but RAM is available outside of the range of KSeg0.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 414b000..a6ea084 100644 (file)
--- 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;