From patchwork Wed Apr 17 19:04:05 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 237343 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 4B9CD2C0188 for ; Thu, 18 Apr 2013 05:04:14 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757139Ab3DQTEM (ORCPT ); Wed, 17 Apr 2013 15:04:12 -0400 Received: from cantor2.suse.de ([195.135.220.15]:43654 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754841Ab3DQTEJ (ORCPT ); Wed, 17 Apr 2013 15:04:09 -0400 Received: from relay1.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id A9CE5A51B7; Wed, 17 Apr 2013 21:04:08 +0200 (CEST) From: Alexander Graf To: kvm-ppc@vger.kernel.org Cc: "kvm@vger.kernel.org mailing list" , Marcelo Tosatti , Gleb Natapov , Bharat Bhushan , Bharat Bhushan Subject: [PATCH 1/3] Added ONE_REG interface for debug instruction Date: Wed, 17 Apr 2013 21:04:05 +0200 Message-Id: <1366225447-24008-2-git-send-email-agraf@suse.de> X-Mailer: git-send-email 1.6.0.2 In-Reply-To: <1366225447-24008-1-git-send-email-agraf@suse.de> References: <1366225447-24008-1-git-send-email-agraf@suse.de> Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org From: Bharat Bhushan 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 Signed-off-by: Alexander Graf --- arch/powerpc/include/asm/kvm_book3s.h | 2 ++ arch/powerpc/include/asm/kvm_booke.h | 2 ++ arch/powerpc/include/uapi/asm/kvm.h | 4 ++++ arch/powerpc/kvm/book3s.c | 6 ++++++ arch/powerpc/kvm/booke.c | 6 ++++++ 5 files changed, 20 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 5a56e1c..bc81842 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -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) diff --git a/arch/powerpc/include/asm/kvm_booke.h b/arch/powerpc/include/asm/kvm_booke.h index b7cd335..d3c1eb3 100644 --- a/arch/powerpc/include/asm/kvm_booke.h +++ b/arch/powerpc/include/asm/kvm_booke.h @@ -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; diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h index ef072b1..c2ff99c 100644 --- a/arch/powerpc/include/uapi/asm/kvm.h +++ b/arch/powerpc/include/uapi/asm/kvm.h @@ -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 */ diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 6548445..2d32ae4 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -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; diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 58057d6..a49a68a 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -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; }