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Commit 2a06dab8 authored by James Hogan's avatar James Hogan Committed by Paolo Bonzini
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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: default avatarJames 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: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 0d17aea5

arch/mips/kvm/mips.c

+12 −0
Original line number Diff line number Diff line
@@ -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;