Re: [PATCH v5 03/12] KVM: arm64: guest debug, define API headers

[Christoffer Dall <christoffer.dall@linaro.org>]

On Fri, May 29, 2015 at 10:30:19AM +0100, Alex Bennée wrote:
> This commit defines the API headers for guest debugging. There are two
> architecture specific debug structures:
> 
>   - kvm_guest_debug_arch, allows us to pass in HW debug registers
>   - kvm_debug_exit_arch, signals exception and possible faulting address
> 
> The type of debugging being used is controlled by the architecture
> specific control bits of the kvm_guest_debug->control flags in the ioctl
> structure.
> 
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
> Reviewed-by: Andrew Jones <drjones@redhat.com>
> Acked-by: Christoffer Dall <christoffer.dall@linaro.org>

I can re-confirm my ack despite the changes in v4, but this really is
borderline to keep exiting r-b and a-b tags around from previous patches
I would think, but ok.

-Christoffer

> 
> ---
> v2
>    - expose hsr and pc directly to user-space
> v3
>    - s/control/controlled/ in commit message
>    - add v8 to ARM ARM comment (ARM Architecture Reference Manual)
>    - add rb tag
>    - rm pc, add far
>    - re-word comments on alignment
>    - rename KVM_ARM_NDBG_REGS -> KVM_ARM_MAX_DBG_REGS
> v4
>    - now uses common HW/SW BP define
>    - add a-b-tag
>    - use u32 for control regs
> v5
>    - revert to have arch specific KVM_GUESTDBG_USE_SW/HW_BP
>    - rm stale comments dbgctrl was stored as u64
> ---
>  arch/arm64/include/uapi/asm/kvm.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
> index d268320..43758e7 100644
> --- a/arch/arm64/include/uapi/asm/kvm.h
> +++ b/arch/arm64/include/uapi/asm/kvm.h
> @@ -100,12 +100,32 @@ struct kvm_sregs {
>  struct kvm_fpu {
>  };
>  
> +/*
> + * See v8 ARM ARM D7.3: Debug Registers
> + *
> + * The architectural limit is 16 debug registers of each type although
> + * in practice there are usually less (see ID_AA64DFR0_EL1).
> + */
> +#define KVM_ARM_MAX_DBG_REGS 16
>  struct kvm_guest_debug_arch {
> +	__u32 dbg_bcr[KVM_ARM_MAX_DBG_REGS];
> +	__u64 dbg_bvr[KVM_ARM_MAX_DBG_REGS];
> +	__u32 dbg_wcr[KVM_ARM_MAX_DBG_REGS];
> +	__u64 dbg_wvr[KVM_ARM_MAX_DBG_REGS];
>  };
>  
>  struct kvm_debug_exit_arch {
> +	__u32 hsr;
> +	__u64 far;
>  };
>  
> +/*
> + * Architecture specific defines for kvm_guest_debug->control
> + */
> +
> +#define KVM_GUESTDBG_USE_SW_BP		(1 << 16)
> +#define KVM_GUESTDBG_USE_HW_BP		(1 << 17)
> +
>  struct kvm_sync_regs {
>  };
>  
> -- 
> 2.4.1
>