[PATCH V4 2/8] KVM: PPC: Book3S HV: Add function kvmhv_vcpu_is_radix()

[Suraj Jitindar Singh]

There exists a function kvm_is_radix() which is used to determine if a
kvm instance is using the radix mmu. However this only applies to the
first level (L1) guest. Add a function kvmhv_vcpu_is_radix() which can
be used to determine if the current execution context of the vcpu is
radix, accounting for if the vcpu is running a nested guest.

Currently all nested guests must be radix but this may change in the
future.

Signed-off-by: Suraj Jitindar Singh <sjitindarsi...@gmail.com>
---
 arch/powerpc/include/asm/kvm_book3s_64.h | 13 +++++++++++++
 arch/powerpc/kvm/book3s_hv_nested.c      |  1 +
 2 files changed, 14 insertions(+)

diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h 
b/arch/powerpc/include/asm/kvm_book3s_64.h
index 6d298145d564..7a9e472f2872 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/arch/powerpc/include/asm/kvm_book3s_64.h
@@ -55,6 +55,7 @@ struct kvm_nested_guest {
        cpumask_t need_tlb_flush;
        cpumask_t cpu_in_guest;
        short prev_cpu[NR_CPUS];
+       u8 radix;                       /* is this nested guest radix */
 };
 
 /*
@@ -150,6 +151,18 @@ static inline bool kvm_is_radix(struct kvm *kvm)
        return kvm->arch.radix;
 }
 
+static inline bool kvmhv_vcpu_is_radix(struct kvm_vcpu *vcpu)
+{
+       bool radix;
+
+       if (vcpu->arch.nested)
+               radix = vcpu->arch.nested->radix;
+       else
+               radix = kvm_is_radix(vcpu->kvm);
+
+       return radix;
+}
+
 #define KVM_DEFAULT_HPT_ORDER  24      /* 16MB HPT by default */
 #endif
 
diff --git a/arch/powerpc/kvm/book3s_hv_nested.c 
b/arch/powerpc/kvm/book3s_hv_nested.c
index 401d2ecbebc5..4fca462e54c4 100644
--- a/arch/powerpc/kvm/book3s_hv_nested.c
+++ b/arch/powerpc/kvm/book3s_hv_nested.c
@@ -480,6 +480,7 @@ struct kvm_nested_guest *kvmhv_alloc_nested(struct kvm 
*kvm, unsigned int lpid)
        if (shadow_lpid < 0)
                goto out_free2;
        gp->shadow_lpid = shadow_lpid;
+       gp->radix = 1;
 
        memset(gp->prev_cpu, -1, sizeof(gp->prev_cpu));
 
-- 
2.13.6