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/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index f045377..a1f2200 100644 (file)
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1807,6 +1807,7 @@ registers, find a list below:
   PPC   | KVM_REG_PPC_TLB1PS   | 32
   PPC   | KVM_REG_PPC_TLB2PS   | 32
   PPC   | KVM_REG_PPC_TLB3PS   | 32
+  PPC   | KVM_REG_PPC_EPTCFG   | 32
 
 ARM registers are mapped using the lower 32 bits.  The upper 16 of that
 is the register group type, or coprocessor number:

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 3b6cee3..8a48e68 100644 (file)
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -504,6 +504,7 @@ struct kvm_vcpu_arch {
        u32 tlbcfg[4];
        u32 tlbps[4];
        u32 mmucfg;
+       u32 eptcfg;
        u32 epr;
        u32 crit_save;
        struct kvmppc_booke_debug_reg dbg_reg;

diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h
index 4dd36c3..41d59d8 100644 (file)
--- a/arch/powerpc/include/uapi/asm/kvm.h
+++ b/arch/powerpc/include/uapi/asm/kvm.h
@@ -469,5 +469,6 @@ struct kvm_get_htab_header {
 #define KVM_REG_PPC_TLB1PS     (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x98)
 #define KVM_REG_PPC_TLB2PS     (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x99)
 #define KVM_REG_PPC_TLB3PS     (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x9a)
+#define KVM_REG_PPC_EPTCFG     (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x9b)
 
 #endif /* __LINUX_KVM_POWERPC_H */

diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c
index 12b8de2..b10a012 100644 (file)
--- a/arch/powerpc/kvm/e500_emulate.c
+++ b/arch/powerpc/kvm/e500_emulate.c
@@ -317,6 +317,15 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
        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 (file)
--- a/arch/powerpc/kvm/e500_mmu.c
+++ b/arch/powerpc/kvm/e500_mmu.c
@@ -624,6 +624,9 @@ int kvmppc_get_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
        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 @@ int kvmppc_set_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
                        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 @@ static int vcpu_mmu_init(struct kvm_vcpu *vcpu,
        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;