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KVM: MIPS: Override HVA error values for EVA

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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 bf640876e2 ("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
This commit is contained in:
James Hogan 2016-08-01 09:07:52 +01:00
parent fa8410b355
commit f6f7017192
1 changed files with 14 additions and 0 deletions
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14
arch/mips/include/asm/kvm_host.h
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@ -107,6 +107,20 @@
#define KVM_INVALID_INST 0xdeadbeef #define KVM_INVALID_INST 0xdeadbeef
#define KVM_INVALID_ADDR 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; extern atomic_t kvm_mips_instance;
struct kvm_vm_stat { struct kvm_vm_stat {