Re: [PATCH v2 03/10] KVM: arm: guest debug, define API headers

Alex Bennée
2015-04-01T16:01:26Z

David Hildenbrand <dahi@linux.vnet.ibm.com> writes:

>> 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 the exact debug exit and pc
>>
>> The type of debugging being used is control by the architecture specific
>
> s/control/controlled/

good catch

>
>> control bits of the kvm_guest_debug->control flags in the ioctl
>> structure.
>>
>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>>
>> ---
>> v2
>> - expose hsr and pc directly to user-space
>>
>> diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
>> index 3ef77a4..6ee70a0 100644
>> --- a/arch/arm64/include/uapi/asm/kvm.h
>> +++ b/arch/arm64/include/uapi/asm/kvm.h
>> @@ -100,10 +100,24 @@ struct kvm_sregs {
>> struct kvm_fpu {
>> };
>>
>> +/*
>> + * See ARM ARM D7.3: Debug Registers
>
> Maybe drop one ARM

Well technically it is the ARM Architecture Reference Manual but that's
quite long winded.

>
>> + *
>> + * The control registers are architecturally defined as 32 bits but are
>> + * stored as 64 bit values along side the value registers and aligned
>> + * with the rest 64 bit registers in the normal CPU context.
>> + */
>> +#define KVM_ARM_NDBG_REGS 16
>> struct kvm_guest_debug_arch {
>> + __u64 dbg_bcr[KVM_ARM_NDBG_REGS];
>> + __u64 dbg_bvr[KVM_ARM_NDBG_REGS];
>> + __u64 dbg_wcr[KVM_ARM_NDBG_REGS];
>> + __u64 dbg_wvr[KVM_ARM_NDBG_REGS];
>> };
>>
>> struct kvm_debug_exit_arch {
>> + __u64 pc;
>> + __u32 hsr;
>> };
>>
>> struct kvm_sync_regs {
>> @@ -207,4 +221,11 @@ struct kvm_arch_memory_slot {
>>
>> #endif
>>
>> +/*
>> + * Architecture related debug defines - upper 16 bits of
>> + * kvm_guest_debug->control
>> + */
>> +#define KVM_GUESTDBG_USE_SW_BP __KVM_GUESTDBG_USE_SW_BP
>> +#define KVM_GUESTDBG_USE_HW_BP __KVM_GUESTDBG_USE_HW_BP
>> +
>> #endif /* __ARM_KVM_H__ */
>
> Looks good to me!

Is that a Reviewed-by?

>
> David

--
Alex Bennée