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KVM: PPC: BOOK3S: PR: Emulate virtual timebase register

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virtual time base register is a per VM, per cpu register that needs
to be saved and restored on vm exit and entry. Writing to VTB is not
allowed in the privileged mode.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[agraf: fix compile error]
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Aneesh Kumar K.V 2014-06-05 17:38:02 +05:30 committed by Alexander Graf
parent 3cd60e3118
commit 8f42ab2749
7 changed files with 30 additions and 7 deletions
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1
arch/powerpc/include/asm/kvm_host.h
View File

@ -505,6 +505,7 @@ struct kvm_vcpu_arch {
#endif
/* Time base value when we entered the guest */
u64 entry_tb;
u64 entry_vtb;
u32 tcr;
ulong tsr; /* we need to perform set/clr_bits() which requires ulong */
u32 ivor[64];

9
arch/powerpc/include/asm/reg.h
View File

@ -1203,6 +1203,15 @@
: "r" ((unsigned long)(v)) \
: "memory")
static inline unsigned long mfvtb (void)
{
#ifdef CONFIG_PPC_BOOK3S_64
if (cpu_has_feature(CPU_FTR_ARCH_207S))
return mfspr(SPRN_VTB);
#endif
return 0;
}
#ifdef __powerpc64__
#if defined(CONFIG_PPC_CELL) || defined(CONFIG_PPC_FSL_BOOK3E)
#define mftb() ({unsigned long rval; \

9
arch/powerpc/include/asm/time.h
View File

@ -102,6 +102,15 @@ static inline u64 get_rtc(void)
return (u64)hi * 1000000000 + lo;
}
static inline u64 get_vtb(void)
{
#ifdef CONFIG_PPC_BOOK3S_64
if (cpu_has_feature(CPU_FTR_ARCH_207S))
return mfvtb();
#endif
return 0;
}
#ifdef CONFIG_PPC64
static inline u64 get_tb(void)
{

6
arch/powerpc/kvm/book3s.c
View File

@ -646,6 +646,9 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
case KVM_REG_PPC_BESCR:
val = get_reg_val(reg->id, vcpu->arch.bescr);
break;
case KVM_REG_PPC_VTB:
val = get_reg_val(reg->id, vcpu->arch.vtb);
break;
default:
r = -EINVAL;
break;
@ -750,6 +753,9 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
case KVM_REG_PPC_BESCR:
vcpu->arch.bescr = set_reg_val(reg->id, val);
break;
case KVM_REG_PPC_VTB:
vcpu->arch.vtb = set_reg_val(reg->id, val);
break;
default:
r = -EINVAL;
break;

3
arch/powerpc/kvm/book3s_emulate.c
View File

@ -577,6 +577,9 @@ int kvmppc_core_emulate_mfspr_pr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val
*/
*spr_val = vcpu->arch.spurr;
break;
case SPRN_VTB:
*spr_val = vcpu->arch.vtb;
break;
case SPRN_GQR0:
case SPRN_GQR1:
case SPRN_GQR2:

6
arch/powerpc/kvm/book3s_hv.c
View File

@ -897,9 +897,6 @@ static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
case KVM_REG_PPC_IC:
*val = get_reg_val(id, vcpu->arch.ic);
break;
case KVM_REG_PPC_VTB:
*val = get_reg_val(id, vcpu->arch.vtb);
break;
case KVM_REG_PPC_CSIGR:
*val = get_reg_val(id, vcpu->arch.csigr);
break;
@ -1097,9 +1094,6 @@ static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
case KVM_REG_PPC_IC:
vcpu->arch.ic = set_reg_val(id, *val);
break;
case KVM_REG_PPC_VTB:
vcpu->arch.vtb = set_reg_val(id, *val);
break;
case KVM_REG_PPC_CSIGR:
vcpu->arch.csigr = set_reg_val(id, *val);
break;

3
arch/powerpc/kvm/book3s_pr.c
View File

@ -125,6 +125,7 @@ void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu,
* to find the guest purr and spurr value.
*/
vcpu->arch.entry_tb = get_tb();
vcpu->arch.entry_vtb = get_vtb();
svcpu->in_use = true;
}
@ -176,7 +177,7 @@ void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu,
*/
vcpu->arch.purr += get_tb() - vcpu->arch.entry_tb;
vcpu->arch.spurr += get_tb() - vcpu->arch.entry_tb;
vcpu->arch.vtb += get_vtb() - vcpu->arch.entry_vtb;
svcpu->in_use = false;
out: