[PATCH 5/8] KVM: PPC: Update kvmppc_st and kvmppc_ld to use quadrants

[Suraj Jitindar Singh]

The functions kvmppc_st and kvmppc_ld are used to access guest memory
from the host using a guest effective address. They do so by translating
through the process table to obtain a guest real address and then using
kvm_read_guest or kvm_write_guest to make the access with the guest real
address.

This method of access however only works for L1 guests and will give the
incorrect results for a nested guest.

We can however use the store_to_eaddr and load_from_eaddr kvmppc_ops to
perform the access for a nested guesti (and a L1 guest). So attempt this
method first and fall back to the old method if this fails and we aren't
running a nested guest.

At this stage there is no fall back method to perform the access for a
nested guest and this is left as a future improvement. For now we will
return to the nested guest and rely on the fact that a translation
should be faulted in before retrying the access.

Signed-off-by: Suraj Jitindar Singh <sjitindarsi...@gmail.com>
---
 arch/powerpc/kvm/powerpc.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 95859c53a5cd..cb029fcab404 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -331,10 +331,17 @@ int kvmppc_st(struct kvm_vcpu *vcpu, ulong *eaddr, int 
size, void *ptr,
 {
        ulong mp_pa = vcpu->arch.magic_page_pa & KVM_PAM & PAGE_MASK;
        struct kvmppc_pte pte;
-       int r;
+       int r = -EINVAL;
 
        vcpu->stat.st++;
 
+       if (vcpu->kvm->arch.kvm_ops && vcpu->kvm->arch.kvm_ops->store_to_eaddr)
+               r = vcpu->kvm->arch.kvm_ops->store_to_eaddr(vcpu, eaddr, ptr,
+                                                           size);
+
+       if ((!r) || (r == -EAGAIN))
+               return r;
+
        r = kvmppc_xlate(vcpu, *eaddr, data ? XLATE_DATA : XLATE_INST,
                         XLATE_WRITE, &pte);
        if (r < 0)
@@ -367,10 +374,17 @@ int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int 
size, void *ptr,
 {
        ulong mp_pa = vcpu->arch.magic_page_pa & KVM_PAM & PAGE_MASK;
        struct kvmppc_pte pte;
-       int rc;
+       int rc = -EINVAL;
 
        vcpu->stat.ld++;
 
+       if (vcpu->kvm->arch.kvm_ops && vcpu->kvm->arch.kvm_ops->load_from_eaddr)
+               rc = vcpu->kvm->arch.kvm_ops->load_from_eaddr(vcpu, eaddr, ptr,
+                                                             size);
+
+       if ((!rc) || (rc == -EAGAIN))
+               return rc;
+
        rc = kvmppc_xlate(vcpu, *eaddr, data ? XLATE_DATA : XLATE_INST,
                          XLATE_READ, &pte);
        if (rc)
-- 
2.13.6