KVM: PPC: e500: Add support for EPTCFG register
EPTCFG register defined by E.PT is accessed unconditionally by Linux guests
in the presence of MAV 2.0. Emulate it now.
Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c
index 12b8de2..b10a012 100644
--- a/arch/powerpc/kvm/e500_emulate.c
+++ b/arch/powerpc/kvm/e500_emulate.c
@@ -317,6 +317,15 @@
case SPRN_MMUCFG:
*spr_val = vcpu->arch.mmucfg;
break;
+ case SPRN_EPTCFG:
+ if (!has_feature(vcpu, VCPU_FTR_MMU_V2))
+ return EMULATE_FAIL;
+ /*
+ * Legacy Linux guests access EPTCFG register even if the E.PT
+ * category is disabled in the VM. Give them a chance to live.
+ */
+ *spr_val = vcpu->arch.eptcfg;
+ break;
/* extra exceptions */
case SPRN_IVOR32:
diff --git a/arch/powerpc/kvm/e500_mmu.c b/arch/powerpc/kvm/e500_mmu.c
index a863dc1..1c1c5cb 100644
--- a/arch/powerpc/kvm/e500_mmu.c
+++ b/arch/powerpc/kvm/e500_mmu.c
@@ -624,6 +624,9 @@
case KVM_REG_PPC_MMUCFG:
*val = get_reg_val(id, vcpu->arch.mmucfg);
break;
+ case KVM_REG_PPC_EPTCFG:
+ *val = get_reg_val(id, vcpu->arch.eptcfg);
+ break;
case KVM_REG_PPC_TLB0CFG:
case KVM_REG_PPC_TLB1CFG:
case KVM_REG_PPC_TLB2CFG:
@@ -678,6 +681,12 @@
r = -EINVAL;
break;
}
+ case KVM_REG_PPC_EPTCFG: {
+ u32 reg = set_reg_val(id, *val);
+ if (reg != vcpu->arch.eptcfg)
+ r = -EINVAL;
+ break;
+ }
case KVM_REG_PPC_TLB0CFG:
case KVM_REG_PPC_TLB1CFG:
case KVM_REG_PPC_TLB2CFG:
@@ -875,6 +884,9 @@
if (has_feature(vcpu, VCPU_FTR_MMU_V2)) {
vcpu->arch.tlbps[0] = mfspr(SPRN_TLB0PS);
vcpu->arch.tlbps[1] = mfspr(SPRN_TLB1PS);
+
+ /* Guest mmu emulation currently doesn't handle E.PT */
+ vcpu->arch.eptcfg = 0;
}
return 0;