Commit f6f70171 authored Aug 01, 2016 by James Hogan

KVM: MIPS: Override HVA error values for EVA



MIPS Enhanced Virtual Addressing (EVA) allows the user mode and kernel
mode address spaces to overlap, breaking the assumption that PAGE_OFFSET
is an appropriate KVM HVA error value, since PAGE_OFFSET may be as low
as zero.

Fix this in the same way that s390 does in commit bf640876 ("KVM:
s390: Make KVM_HVA_ERR_BAD usable on s390"), by overriding
KVM_HVA_ERR_[RO_]BAD and kvm_is_error_hva() in asm/kvm_host.h.

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

parent fa8410b3

arch/mips/include/asm/kvm_host.h

+14 −0

Original line number	Diff line number	Diff line
		@@ -107,6 +107,20 @@
		#define KVM_INVALID_INST 0xdeadbeef
		#define KVM_INVALID_ADDR 0xdeadbeef

		/*
		* EVA has overlapping user & kernel address spaces, so user VAs may be >
		* PAGE_OFFSET. For this reason we can't use the default KVM_HVA_ERR_BAD of
		* PAGE_OFFSET.
		*/

		#define KVM_HVA_ERR_BAD (-1UL)
		#define KVM_HVA_ERR_RO_BAD (-2UL)

		static inline bool kvm_is_error_hva(unsigned long addr)
		{
		return IS_ERR_VALUE(addr);
		}

		extern atomic_t kvm_mips_instance;

		struct kvm_vm_stat {