Re: [PATCH v3 02/12] KVM: define common __KVM_GUESTDBG_USE_SW/HW_BP values

[Paolo Bonzini <pbonzini@redhat.com>]

On 08/05/2015 11:23, Christoffer Dall wrote:
> On Wed, May 06, 2015 at 05:23:17PM +0100, Alex Bennée wrote:
>> Currently x86, powerpc and soon arm64 use the same two architecture
>> specific bits for guest debug support for software and hardware
>> breakpoints. This makes the shared values explicit while leaving the
>> gate open for another architecture to use some other value if they
>> really really want to.
>>
>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>> Reviewed-by: Andrew Jones <drjones@redhat.com>
>>
>> diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h
>> index ab4d473..1731569 100644
>> --- a/arch/powerpc/include/uapi/asm/kvm.h
>> +++ b/arch/powerpc/include/uapi/asm/kvm.h
>> @@ -310,8 +310,8 @@ struct kvm_guest_debug_arch {
>>   * 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
>> +#define KVM_GUESTDBG_USE_SW_BP		__KVM_GUESTDBG_USE_SW_BP
>> +#define KVM_GUESTDBG_USE_HW_BP		__KVM_GUESTDBG_USE_HW_BP
>>  
>>  /* definition of registers in kvm_run */
>>  struct kvm_sync_regs {
>> diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
>> index d7dcef5..1438202 100644
>> --- a/arch/x86/include/uapi/asm/kvm.h
>> +++ b/arch/x86/include/uapi/asm/kvm.h
>> @@ -250,8 +250,8 @@ struct kvm_debug_exit_arch {
>>  	__u64 dr7;
>>  };
>>  
>> -#define KVM_GUESTDBG_USE_SW_BP		0x00010000
>> -#define KVM_GUESTDBG_USE_HW_BP		0x00020000
>> +#define KVM_GUESTDBG_USE_SW_BP		__KVM_GUESTDBG_USE_SW_BP
>> +#define KVM_GUESTDBG_USE_HW_BP		__KVM_GUESTDBG_USE_HW_BP
>>  #define KVM_GUESTDBG_INJECT_DB		0x00040000
>>  #define KVM_GUESTDBG_INJECT_BP		0x00080000
>>  
>> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
>> index 70ac641..3b6252e 100644
>> --- a/include/uapi/linux/kvm.h
>> +++ b/include/uapi/linux/kvm.h
>> @@ -570,8 +570,16 @@ struct kvm_s390_irq_state {
>>  
>>  /* for KVM_SET_GUEST_DEBUG */
>>  
>> -#define KVM_GUESTDBG_ENABLE		0x00000001
>> -#define KVM_GUESTDBG_SINGLESTEP		0x00000002
>> +#define KVM_GUESTDBG_ENABLE		(1 << 0)
>> +#define KVM_GUESTDBG_SINGLESTEP	(1 << 1)
>> +
>> +/*
>> + * Architecture specific stuff uses the top 16 bits of the field,
> 
> s/stuff/<something more specific>/
> 
>> + * however there is some shared commonality for the common cases
>> + */
>> +#define __KVM_GUESTDBG_USE_SW_BP	(1 << 16)
>> +#define __KVM_GUESTDBG_USE_HW_BP	(1 << 17)
>> +
>>  
>>  struct kvm_guest_debug {
>>  	__u32 control;
> 
> We sort of left this discussion hanging with me expressing slight
> concern about the usefulness about these defines.
> 
> Paolo, what are your thoughts?

I would just lift these two KVM_GUESTDBG_* defines to
include/uapi/linux/kvm.h and say that architecture specific stuff uses
the top 14 bits of the field. :)

Paolo