Re: [PATCH 2/7] Added ONE_REG interface for debug instruction
On 14.03.2013, at 05:30, Bhushan Bharat-R65777 wrote: -Original Message- From: Alexander Graf [mailto:ag...@suse.de] Sent: Thursday, March 07, 2013 6:38 PM To: Bhushan Bharat-R65777 Cc: kvm-ppc@vger.kernel.org; k...@vger.kernel.org; Wood Scott-B07421; Bhushan Bharat-R65777 Subject: Re: [PATCH 2/7] Added ONE_REG interface for debug instruction On 28.02.2013, at 05:13, Bharat Bhushan wrote: 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.bhus...@freescale.com --- Documentation/virtual/kvm/api.txt |1 + arch/powerpc/include/asm/kvm_book3s.h |1 + 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 ++ 6 files changed, 20 insertions(+), 0 deletions(-) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index cce500a..dbfcc04 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -1766,6 +1766,7 @@ registers, find a list below: PPC | KVM_REG_PPC_TSR| 32 PPC | KVM_REG_PPC_OR_TSR | 32 PPC | KVM_REG_PPC_CLEAR_TSR | 32 + PPC | KVM_REG_PPC_DEBUG_INST| 32 4.69 KVM_GET_ONE_REG diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 5a56e1c..36164cc 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -458,6 +458,7 @@ static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu) #define OSI_SC_MAGIC_R4 0x77810F9B #define INS_DCBZ0x7c0007ec +#define INS_TW 0x7c08 This one should be trap, so TO needs to be 31. The instruction as it's here is a nop if I read the spec correctly. Yes I missed this. BTW rather than setting TO = 31, what if we set TO = 2 as RA and RB is same here. Well, the unconditional trap instruction is simply defined as TO = 31, so I'd stick to that :) Alex -- To unsubscribe from this list: send the line unsubscribe kvm-ppc in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
RE: [PATCH 2/7] Added ONE_REG interface for debug instruction
-Original Message- From: Alexander Graf [mailto:ag...@suse.de] Sent: Thursday, March 07, 2013 6:38 PM To: Bhushan Bharat-R65777 Cc: kvm-ppc@vger.kernel.org; k...@vger.kernel.org; Wood Scott-B07421; Bhushan Bharat-R65777 Subject: Re: [PATCH 2/7] Added ONE_REG interface for debug instruction On 28.02.2013, at 05:13, Bharat Bhushan wrote: 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.bhus...@freescale.com --- Documentation/virtual/kvm/api.txt |1 + arch/powerpc/include/asm/kvm_book3s.h |1 + 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 ++ 6 files changed, 20 insertions(+), 0 deletions(-) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index cce500a..dbfcc04 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -1766,6 +1766,7 @@ registers, find a list below: PPC | KVM_REG_PPC_TSR | 32 PPC | KVM_REG_PPC_OR_TSR| 32 PPC | KVM_REG_PPC_CLEAR_TSR | 32 + PPC | KVM_REG_PPC_DEBUG_INST| 32 4.69 KVM_GET_ONE_REG diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 5a56e1c..36164cc 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -458,6 +458,7 @@ static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu) #define OSI_SC_MAGIC_R4 0x77810F9B #define INS_DCBZ0x7c0007ec +#define INS_TW 0x7c08 This one should be trap, so TO needs to be 31. The instruction as it's here is a nop if I read the spec correctly. Yes I missed this. BTW rather than setting TO = 31, what if we set TO = 2 as RA and RB is same here. -Bharat Alex /* 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_LPIDS64 +#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 a4b6452..975a401 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -530,6 +530,12 @@ 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 8b553c0..a41cd6d 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -1448,6 +1448,12 @@ 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; } -- 1.7.0.4 -- To unsubscribe from this list: send the line unsubscribe kvm-ppc in the body of a message to majord...@vger.kernel.org More
Re: [PATCH 2/7] Added ONE_REG interface for debug instruction
On 28.02.2013, at 05:13, Bharat Bhushan wrote: 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.bhus...@freescale.com --- Documentation/virtual/kvm/api.txt |1 + arch/powerpc/include/asm/kvm_book3s.h |1 + 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 ++ 6 files changed, 20 insertions(+), 0 deletions(-) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index cce500a..dbfcc04 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -1766,6 +1766,7 @@ registers, find a list below: PPC | KVM_REG_PPC_TSR | 32 PPC | KVM_REG_PPC_OR_TSR | 32 PPC | KVM_REG_PPC_CLEAR_TSR | 32 + PPC | KVM_REG_PPC_DEBUG_INST| 32 4.69 KVM_GET_ONE_REG diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 5a56e1c..36164cc 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -458,6 +458,7 @@ static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu) #define OSI_SC_MAGIC_R4 0x77810F9B #define INS_DCBZ 0x7c0007ec +#define INS_TW 0x7c08 This one should be trap, so TO needs to be 31. The instruction as it's here is a nop if I read the spec correctly. Alex /* 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_LPIDS64 +#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 a4b6452..975a401 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -530,6 +530,12 @@ 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 8b553c0..a41cd6d 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -1448,6 +1448,12 @@ 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; } -- 1.7.0.4 -- To unsubscribe from this list: send the line unsubscribe kvm-ppc in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm-ppc in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH 2/7] Added ONE_REG interface for debug instruction
On 02/27/2013 10:13:11 PM, Bharat Bhushan wrote: diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 8b553c0..a41cd6d 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -1448,6 +1448,12 @@ 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; + } We're using ehpriv even for PR-mode KVM (e.g. e500v2)? -Scott -- To unsubscribe from this list: send the line unsubscribe kvm-ppc in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH 2/7] Added ONE_REG interface for debug instruction
On 28.02.2013, at 17:23, Scott Wood wrote: On 02/27/2013 10:13:11 PM, Bharat Bhushan wrote: diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 8b553c0..a41cd6d 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -1448,6 +1448,12 @@ 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; +} We're using ehpriv even for PR-mode KVM (e.g. e500v2)? If it's a reserved instruction, that should work. Since we need to use a single instruction to replace the debugged one with, any reserved opcode should be as good as any other, right? Alex -- To unsubscribe from this list: send the line unsubscribe kvm-ppc in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
RE: [PATCH 2/7] Added ONE_REG interface for debug instruction
-Original Message- From: kvm-ppc-ow...@vger.kernel.org [mailto:kvm-ppc- ow...@vger.kernel.org] On Behalf Of Alexander Graf Sent: Thursday, February 28, 2013 10:22 PM To: Wood Scott-B07421 Cc: Bhushan Bharat-R65777; kvm-ppc@vger.kernel.org; k...@vger.kernel.org; Bhushan Bharat-R65777 Subject: Re: [PATCH 2/7] Added ONE_REG interface for debug instruction On 28.02.2013, at 17:23, Scott Wood wrote: On 02/27/2013 10:13:11 PM, Bharat Bhushan wrote: diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 8b553c0..a41cd6d 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -1448,6 +1448,12 @@ 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; + } We're using ehpriv even for PR-mode KVM (e.g. e500v2)? If it's a reserved instruction, that should work. Since we need to use a single instruction to replace the debugged one with, any reserved opcode should be as good as any other, right? Right, that has been the idea here. Thanks -Bharat Alex -- To unsubscribe from this list: send the line unsubscribe kvm-ppc in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm-ppc in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html