| Message ID | 1345557120-16197-5-git-send-email-Bharat.Bhushan@freescale.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 21.08.2012, at 15:51, Bharat Bhushan wrote: > This patch defines the interface parameter for KVM_SET_GUEST_DEBUG > ioctl support. Follow up patches will use this for setting up > hardware breakpoints, watchpoints and software breakpoints. > > Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com> > --- > arch/powerpc/include/asm/kvm.h | 33 +++++++++++++++++++++++++++++++++ > arch/powerpc/kvm/book3s.c | 6 ++++++ > arch/powerpc/kvm/booke.c | 6 ++++++ > arch/powerpc/kvm/powerpc.c | 6 ------ > 4 files changed, 45 insertions(+), 6 deletions(-) > > diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/asm/kvm.h > index 3c14202..61b197e 100644 > --- a/arch/powerpc/include/asm/kvm.h > +++ b/arch/powerpc/include/asm/kvm.h > @@ -269,8 +269,41 @@ struct kvm_debug_exit_arch { > > /* for KVM_SET_GUEST_DEBUG */ > struct kvm_guest_debug_arch { > + struct { > + /* H/W breakpoint/watchpoint address */ > + __u64 addr; > + /* > + * Type denotes h/w breakpoint, read watchpoint, write > + * watchpoint or watchpoint (both read and write). > + */ > +#define KVMPPC_DEBUG_NOTYPE 0x0 > +#define KVMPPC_DEBUG_BREAKPOINT (1UL << 1) > +#define KVMPPC_DEBUG_WATCH_WRITE (1UL << 2) > +#define KVMPPC_DEBUG_WATCH_READ (1UL << 3) > + __u32 type; > + __u32 pad1; Why the padding? > + __u64 pad2; > + } bp[16]; Why 16? > }; > > +/* Debug related defines */ > +/* > + * kvm_guest_debug->control is a 32 bit field. The lower 16 bits are generic > + * and upper 16 bits are architecture specific. Architecture specific defines > + * that ioctl is for setting hardware breakpoint or software breakpoint. > + */ > +#define KVM_GUESTDBG_USE_SW_BP 0x00010000 > +#define KVM_GUESTDBG_USE_HW_BP 0x00020000 > + > +/* When setting software breakpoint, Change the software breakpoint > + * instruction to special trap instruction and set KVM_GUESTDBG_USE_SW_BP > + * flag in kvm_guest_debug->control. KVM does keep track of software > + * breakpoints. So when KVM_GUESTDBG_USE_SW_BP flag is set and special trap > + * instruction is executed by guest then exit to userspace. > + * NOTE: A Nice interface can be added to get the special trap instruction. > + */ > +#define KVMPPC_INST_GUEST_GDB 0x7C00021C /* ehpriv OC=0 */ This definitely has to be passed to user space (which writes that instruction into guest phys memory). Other PPC subarchs will use different instructions. Just model it as a read-only ONE_REG. Alex -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
> -----Original Message----- > From: Alexander Graf [mailto:agraf@suse.de] > Sent: Monday, September 24, 2012 9:09 PM > To: Bhushan Bharat-R65777 > Cc: kvm-ppc@vger.kernel.org; kvm@vger.kernel.org; Bhushan Bharat-R65777 > Subject: Re: [PATCH 4/6] KVM: PPC: debug stub interface parameter defined > > > On 21.08.2012, at 15:51, Bharat Bhushan wrote: > > > This patch defines the interface parameter for KVM_SET_GUEST_DEBUG > > ioctl support. Follow up patches will use this for setting up hardware > > breakpoints, watchpoints and software breakpoints. > > > > Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com> > > --- > > arch/powerpc/include/asm/kvm.h | 33 +++++++++++++++++++++++++++++++++ > > arch/powerpc/kvm/book3s.c | 6 ++++++ > > arch/powerpc/kvm/booke.c | 6 ++++++ > > arch/powerpc/kvm/powerpc.c | 6 ------ > > 4 files changed, 45 insertions(+), 6 deletions(-) > > > > diff --git a/arch/powerpc/include/asm/kvm.h > > b/arch/powerpc/include/asm/kvm.h index 3c14202..61b197e 100644 > > --- a/arch/powerpc/include/asm/kvm.h > > +++ b/arch/powerpc/include/asm/kvm.h > > @@ -269,8 +269,41 @@ struct kvm_debug_exit_arch { > > > > /* for KVM_SET_GUEST_DEBUG */ > > struct kvm_guest_debug_arch { > > + struct { > > + /* H/W breakpoint/watchpoint address */ > > + __u64 addr; > > + /* > > + * Type denotes h/w breakpoint, read watchpoint, write > > + * watchpoint or watchpoint (both read and write). > > + */ > > +#define KVMPPC_DEBUG_NOTYPE 0x0 > > +#define KVMPPC_DEBUG_BREAKPOINT (1UL << 1) > > +#define KVMPPC_DEBUG_WATCH_WRITE (1UL << 2) > > +#define KVMPPC_DEBUG_WATCH_READ (1UL << 3) > > + __u32 type; > > + __u32 pad1; > > Why the padding? Not sure why, I will remove this. > > > + __u64 pad2; > > + } bp[16]; > > Why 16? I think for now 6 (4 iac + 2 dac) is sufficient for BOOKE. We kept 16 to have some room for future and other platforms. Thanks -Bharat > > > }; > > > > +/* Debug related defines */ > > +/* > > + * kvm_guest_debug->control is a 32 bit field. The lower 16 bits are > > +generic > > + * and upper 16 bits are architecture specific. Architecture specific > > +defines > > + * that ioctl is for setting hardware breakpoint or software breakpoint. > > + */ > > +#define KVM_GUESTDBG_USE_SW_BP 0x00010000 > > +#define KVM_GUESTDBG_USE_HW_BP 0x00020000 > > + > > +/* When setting software breakpoint, Change the software breakpoint > > + * instruction to special trap instruction and set > > +KVM_GUESTDBG_USE_SW_BP > > + * flag in kvm_guest_debug->control. KVM does keep track of software > > + * breakpoints. So when KVM_GUESTDBG_USE_SW_BP flag is set and > > +special trap > > + * instruction is executed by guest then exit to userspace. > > + * NOTE: A Nice interface can be added to get the special trap instruction. > > + */ > > +#define KVMPPC_INST_GUEST_GDB 0x7C00021C /* ehpriv OC=0 */ > > This definitely has to be passed to user space (which writes that instruction > into guest phys memory). Other PPC subarchs will use different instructions. > Just model it as a read-only ONE_REG. > > > Alex > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
> -----Original Message----- > From: Alexander Graf [mailto:agraf@suse.de] > Sent: Monday, September 24, 2012 9:09 PM > To: Bhushan Bharat-R65777 > Cc: kvm-ppc@vger.kernel.org; kvm@vger.kernel.org; Bhushan Bharat-R65777 > Subject: Re: [PATCH 4/6] KVM: PPC: debug stub interface parameter defined > > > On 21.08.2012, at 15:51, Bharat Bhushan wrote: > > > This patch defines the interface parameter for KVM_SET_GUEST_DEBUG > > ioctl support. Follow up patches will use this for setting up hardware > > breakpoints, watchpoints and software breakpoints. > > > > Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com> > > --- > > arch/powerpc/include/asm/kvm.h | 33 +++++++++++++++++++++++++++++++++ > > arch/powerpc/kvm/book3s.c | 6 ++++++ > > arch/powerpc/kvm/booke.c | 6 ++++++ > > arch/powerpc/kvm/powerpc.c | 6 ------ > > 4 files changed, 45 insertions(+), 6 deletions(-) > > > > diff --git a/arch/powerpc/include/asm/kvm.h > > b/arch/powerpc/include/asm/kvm.h index 3c14202..61b197e 100644 > > --- a/arch/powerpc/include/asm/kvm.h > > +++ b/arch/powerpc/include/asm/kvm.h > > @@ -269,8 +269,41 @@ struct kvm_debug_exit_arch { > > > > /* for KVM_SET_GUEST_DEBUG */ > > struct kvm_guest_debug_arch { > > + struct { > > + /* H/W breakpoint/watchpoint address */ > > + __u64 addr; > > + /* > > + * Type denotes h/w breakpoint, read watchpoint, write > > + * watchpoint or watchpoint (both read and write). > > + */ > > +#define KVMPPC_DEBUG_NOTYPE 0x0 > > +#define KVMPPC_DEBUG_BREAKPOINT (1UL << 1) > > +#define KVMPPC_DEBUG_WATCH_WRITE (1UL << 2) > > +#define KVMPPC_DEBUG_WATCH_READ (1UL << 3) > > + __u32 type; > > + __u32 pad1; > > Why the padding? > > > + __u64 pad2; > > + } bp[16]; > > Why 16? > > > }; > > > > +/* Debug related defines */ > > +/* > > + * kvm_guest_debug->control is a 32 bit field. The lower 16 bits are > > +generic > > + * and upper 16 bits are architecture specific. Architecture specific > > +defines > > + * that ioctl is for setting hardware breakpoint or software breakpoint. > > + */ > > +#define KVM_GUESTDBG_USE_SW_BP 0x00010000 > > +#define KVM_GUESTDBG_USE_HW_BP 0x00020000 > > + > > +/* When setting software breakpoint, Change the software breakpoint > > + * instruction to special trap instruction and set > > +KVM_GUESTDBG_USE_SW_BP > > + * flag in kvm_guest_debug->control. KVM does keep track of software > > + * breakpoints. So when KVM_GUESTDBG_USE_SW_BP flag is set and > > +special trap > > + * instruction is executed by guest then exit to userspace. > > + * NOTE: A Nice interface can be added to get the special trap instruction. > > + */ > > +#define KVMPPC_INST_GUEST_GDB 0x7C00021C /* ehpriv OC=0 */ > > This definitely has to be passed to user space (which writes that instruction > into guest phys memory). Other PPC subarchs will use different instructions. > Just model it as a read-only ONE_REG. Ok. Thanks -Bharat -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 04.10.2012, at 09:14, Bhushan Bharat-R65777 wrote: > > >> -----Original Message----- >> From: Alexander Graf [mailto:agraf@suse.de] >> Sent: Monday, September 24, 2012 9:09 PM >> To: Bhushan Bharat-R65777 >> Cc: kvm-ppc@vger.kernel.org; kvm@vger.kernel.org; Bhushan Bharat-R65777 >> Subject: Re: [PATCH 4/6] KVM: PPC: debug stub interface parameter defined >> >> >> On 21.08.2012, at 15:51, Bharat Bhushan wrote: >> >>> This patch defines the interface parameter for KVM_SET_GUEST_DEBUG >>> ioctl support. Follow up patches will use this for setting up hardware >>> breakpoints, watchpoints and software breakpoints. >>> >>> Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com> >>> --- >>> arch/powerpc/include/asm/kvm.h | 33 +++++++++++++++++++++++++++++++++ >>> arch/powerpc/kvm/book3s.c | 6 ++++++ >>> arch/powerpc/kvm/booke.c | 6 ++++++ >>> arch/powerpc/kvm/powerpc.c | 6 ------ >>> 4 files changed, 45 insertions(+), 6 deletions(-) >>> >>> diff --git a/arch/powerpc/include/asm/kvm.h >>> b/arch/powerpc/include/asm/kvm.h index 3c14202..61b197e 100644 >>> --- a/arch/powerpc/include/asm/kvm.h >>> +++ b/arch/powerpc/include/asm/kvm.h >>> @@ -269,8 +269,41 @@ struct kvm_debug_exit_arch { >>> >>> /* for KVM_SET_GUEST_DEBUG */ >>> struct kvm_guest_debug_arch { >>> + struct { >>> + /* H/W breakpoint/watchpoint address */ >>> + __u64 addr; >>> + /* >>> + * Type denotes h/w breakpoint, read watchpoint, write >>> + * watchpoint or watchpoint (both read and write). >>> + */ >>> +#define KVMPPC_DEBUG_NOTYPE 0x0 >>> +#define KVMPPC_DEBUG_BREAKPOINT (1UL << 1) >>> +#define KVMPPC_DEBUG_WATCH_WRITE (1UL << 2) >>> +#define KVMPPC_DEBUG_WATCH_READ (1UL << 3) >>> + __u32 type; >>> + __u32 pad1; >> >> Why the padding? > > Not sure why, I will remove this. Oh, I think the padding makes sense - depending on the type of interrupt this could for example mean "break when write to address x becomes value y". I'm not sure the amount of padding and the structure of it is the right way to go though: We probably want to have a union here defining type specific payloads. > >> >>> + __u64 pad2; >>> + } bp[16]; >> >> Why 16? > > I think for now 6 (4 iac + 2 dac) is sufficient for BOOKE. We kept 16 to have some room for future and other platforms. Ok :) Alex -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/asm/kvm.h index 3c14202..61b197e 100644 --- a/arch/powerpc/include/asm/kvm.h +++ b/arch/powerpc/include/asm/kvm.h @@ -269,8 +269,41 @@ struct kvm_debug_exit_arch { /* for KVM_SET_GUEST_DEBUG */ struct kvm_guest_debug_arch { + struct { + /* H/W breakpoint/watchpoint address */ + __u64 addr; + /* + * Type denotes h/w breakpoint, read watchpoint, write + * watchpoint or watchpoint (both read and write). + */ +#define KVMPPC_DEBUG_NOTYPE 0x0 +#define KVMPPC_DEBUG_BREAKPOINT (1UL << 1) +#define KVMPPC_DEBUG_WATCH_WRITE (1UL << 2) +#define KVMPPC_DEBUG_WATCH_READ (1UL << 3) + __u32 type; + __u32 pad1; + __u64 pad2; + } bp[16]; }; +/* Debug related defines */ +/* + * kvm_guest_debug->control is a 32 bit field. The lower 16 bits are generic + * and upper 16 bits are architecture specific. Architecture specific defines + * that ioctl is for setting hardware breakpoint or software breakpoint. + */ +#define KVM_GUESTDBG_USE_SW_BP 0x00010000 +#define KVM_GUESTDBG_USE_HW_BP 0x00020000 + +/* When setting software breakpoint, Change the software breakpoint + * instruction to special trap instruction and set KVM_GUESTDBG_USE_SW_BP + * flag in kvm_guest_debug->control. KVM does keep track of software + * breakpoints. So when KVM_GUESTDBG_USE_SW_BP flag is set and special trap + * instruction is executed by guest then exit to userspace. + * NOTE: A Nice interface can be added to get the special trap instruction. + */ +#define KVMPPC_INST_GUEST_GDB 0x7C00021C /* ehpriv OC=0 */ + /* definition of registers in kvm_run */ struct kvm_sync_regs { }; diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index e946665..385b027 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -475,6 +475,12 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) return 0; } +int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, + struct kvm_guest_debug *dbg) +{ + return -EINVAL; +} + int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { return -ENOTSUPP; diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 90d4798..dd0e5b8 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -1403,6 +1403,12 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) return r; } +int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, + struct kvm_guest_debug *dbg) +{ + return -EINVAL; +} + int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { return -ENOTSUPP; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 32d217c..c565f5d 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -518,12 +518,6 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) vcpu->cpu = -1; } -int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, - struct kvm_guest_debug *dbg) -{ - return -EINVAL; -} - static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu, struct kvm_run *run) {
This patch defines the interface parameter for KVM_SET_GUEST_DEBUG ioctl support. Follow up patches will use this for setting up hardware breakpoints, watchpoints and software breakpoints. Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com> --- arch/powerpc/include/asm/kvm.h | 33 +++++++++++++++++++++++++++++++++ arch/powerpc/kvm/book3s.c | 6 ++++++ arch/powerpc/kvm/booke.c | 6 ++++++ arch/powerpc/kvm/powerpc.c | 6 ------ 4 files changed, 45 insertions(+), 6 deletions(-)