KVM: PPC: Add support for explicit HIOR setting

Until now, we always set HIOR based on the PVR, but this is just wrong.
Instead, we should be setting HIOR explicitly, so user space can decide
what the initial HIOR value is - just like on real hardware.

We keep the old PVR based way around for backwards compatibility, but
once user space uses the SREGS based method, we drop the PVR logic.

Signed-off-by: Alexander Graf <agraf@suse.de>

2 files changed, 13 insertions, 2 deletions

diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 0c0d3f274437..78dcf659e120 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -150,13 +150,15 @@ void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
 #ifdef CONFIG_PPC_BOOK3S_64
         if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
                 kvmppc_mmu_book3s_64_init(vcpu);
-                to_book3s(vcpu)->hior = 0xfff00000;
+                if (!to_book3s(vcpu)->hior_sregs)
+                        to_book3s(vcpu)->hior = 0xfff00000;
                 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
         } else
 #endif
         {
                 kvmppc_mmu_book3s_32_init(vcpu);
-                to_book3s(vcpu)->hior = 0;
+                if (!to_book3s(vcpu)->hior_sregs)
+                        to_book3s(vcpu)->hior = 0;
                 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
         }
 
@@ -770,6 +772,9 @@ int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
                 }
         }
 
+        if (sregs->u.s.flags & KVM_SREGS_S_HIOR)
+                sregs->u.s.hior = to_book3s(vcpu)->hior;
+
         return 0;
 }
 
@@ -806,6 +811,11 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
         /* Flush the MMU after messing with the segments */
         kvmppc_mmu_pte_flush(vcpu, 0, 0);
 
+        if (sregs->u.s.flags & KVM_SREGS_S_HIOR) {
+                to_book3s(vcpu)->hior_sregs = true;
+                to_book3s(vcpu)->hior = sregs->u.s.hior;
+        }
+
         return 0;
 }
 
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index a107c9be0fb1..17a5c83e1ccc 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -188,6 +188,7 @@ int kvm_dev_ioctl_check_extension(long ext)
         case KVM_CAP_PPC_BOOKE_SREGS:
 #else
         case KVM_CAP_PPC_SEGSTATE:
+        case KVM_CAP_PPC_HIOR:
 #endif
         case KVM_CAP_PPC_UNSET_IRQ:
         case KVM_CAP_PPC_IRQ_LEVEL: