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KVM: MIPS/MMU: Use lockless GVA helpers for get_inst()

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Use the lockless GVA helpers to implement the reading of guest
instructions for emulation. This will allow it to handle asynchronous
TLB flushes when they are implemented.

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 2016-11-28 23:15:53 +00:00
parent 4b21e8abf9
commit 5207ce144a
1 changed files with 19 additions and 4 deletions
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23
arch/mips/kvm/mmu.c
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@ -787,11 +787,26 @@ int kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu, u32 *out)
{
int err;
retry:
kvm_trap_emul_gva_lockless_begin(vcpu);
err = get_user(*out, opc);
if (unlikely(err)) {
kvm_err("%s: illegal address: %p\n", __func__, opc);
return -EFAULT;
}
kvm_trap_emul_gva_lockless_end(vcpu);
if (unlikely(err)) {
/*
* Try to handle the fault, maybe we just raced with a GVA
* invalidation.
*/
err = kvm_trap_emul_gva_fault(vcpu, (unsigned long)opc,
false);
if (unlikely(err)) {
kvm_err("%s: illegal address: %p\n",
__func__, opc);
return -EFAULT;
}
/* Hopefully it'll work now */
goto retry;
}
return 0;
}