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Added ONE_REG interface for debug instruction

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This patch adds the one_reg interface to get the special instruction
to be used for setting software breakpoint from userspace.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Bharat Bhushan 2013-03-20 20:24:58 +00:00 committed by Alexander Graf
parent fca7567c30
commit 8c32a2ea65
5 changed files with 20 additions and 0 deletions
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2
arch/powerpc/include/asm/kvm_book3s.h
View File

@ -458,6 +458,8 @@ static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu)
#define OSI_SC_MAGIC_R4 0x77810F9B
#define INS_DCBZ 0x7c0007ec
/* TO = 31 for unconditional trap */
#define INS_TW 0x7fe00008
/* LPIDs we support with this build -- runtime limit may be lower */
#define KVMPPC_NR_LPIDS (LPID_RSVD + 1)

2
arch/powerpc/include/asm/kvm_booke.h
View File

@ -26,6 +26,8 @@
/* LPIDs we support with this build -- runtime limit may be lower */
#define KVMPPC_NR_LPIDS 64
#define KVMPPC_INST_EHPRIV 0x7c00021c
static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val)
{
vcpu->arch.gpr[num] = val;

4
arch/powerpc/include/uapi/asm/kvm.h
View File

@ -422,4 +422,8 @@ struct kvm_get_htab_header {
#define KVM_REG_PPC_CLEAR_TSR (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x88)
#define KVM_REG_PPC_TCR (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x89)
#define KVM_REG_PPC_TSR (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x8a)
/* Debugging: Special instruction for software breakpoint */
#define KVM_REG_PPC_DEBUG_INST (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x8b)
#endif /* __LINUX_KVM_POWERPC_H */

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

@ -529,6 +529,12 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
val = get_reg_val(reg->id, vcpu->arch.vscr.u[3]);
break;
#endif /* CONFIG_ALTIVEC */
case KVM_REG_PPC_DEBUG_INST: {
u32 opcode = INS_TW;
r = copy_to_user((u32 __user *)(long)reg->addr,
&opcode, sizeof(u32));
break;
}
default:
r = -EINVAL;
break;

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

@ -1447,6 +1447,12 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
case KVM_REG_PPC_TSR:
r = put_user(vcpu->arch.tsr, (u32 __user *)(long)reg->addr);
break;
case KVM_REG_PPC_DEBUG_INST: {
u32 opcode = KVMPPC_INST_EHPRIV;
r = copy_to_user((u32 __user *)(long)reg->addr,
&opcode, sizeof(u32));
break;
}
default:
break;
}