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Commit 8c32a2ea authored by Bharat Bhushan's avatar Bharat Bhushan Committed by Alexander Graf
Browse files

Added ONE_REG interface for debug instruction 



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

Signed-off-by: default avatarBharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent fca7567c

arch/powerpc/include/asm/kvm_book3s.h

+2 −0
Original line number Diff line number Diff line
@@ -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)

arch/powerpc/include/asm/kvm_booke.h

+2 −0
Original line number Diff line number Diff line
@@ -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;

arch/powerpc/include/uapi/asm/kvm.h

+4 −0
Original line number Diff line number Diff line
@@ -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 */

arch/powerpc/kvm/book3s.c

+6 −0
Original line number Diff line number Diff line
@@ -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;

arch/powerpc/kvm/booke.c

+6 −0
Original line number Diff line number Diff line
@@ -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;

	}