linux-kernel - Re: [PATCH v4 06/15] KVM: arm64: Add paravirtualization header files

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Date:   Thu, 13 Jan 2022 16:00:35 +0800
From:   Gavin Shan <gshan@...hat.com>
To:     Eric Auger <eauger@...hat.com>, kvmarm@...ts.cs.columbia.edu
Cc:     kvm@...r.kernel.org, maz@...nel.org, linux-kernel@...r.kernel.org,
        shan.gavin@...il.com, Jonathan.Cameron@...wei.com,
        pbonzini@...hat.com, vkuznets@...hat.com, will@...nel.org
Subject: Re: [PATCH v4 06/15] KVM: arm64: Add paravirtualization header files

Hi Eric,

On 11/11/21 2:06 AM, Eric Auger wrote:
> On 8/15/21 2:59 AM, Gavin Shan wrote:
>> We need put more stuff in the paravirtualization header files when
>> the asynchronous page fault is supported. The generic header files
>> can't meet the goal.
> you need to explain why
>   This duplicate the generic header files to be
> s/This duplicate/Duplicate

Ok.

>> our platform specific header files. It's the preparatory work to
>> support the asynchronous page fault in the subsequent patches:
> why duplication and not move. Shouldn't it be squashed with another
> subsequent patch?
> 

It's also fine to squash this one to PATCH[v4 07/15]. My intent was
to keep them separate to make PATCH[v4 07/17] a bit easier to be
reviewed. So lets keep it as separate patch :)

>>
>>     include/uapi/asm-generic/kvm_para.h
>>     include/asm-generic/kvm_para.h
>>
>>     arch/arm64/include/uapi/asm/kvm_para.h
>>     arch/arm64/include/asm/kvm_para.h
>>
>> Signed-off-by: Gavin Shan <gshan@...hat.com>
>> ---
>>   arch/arm64/include/asm/kvm_para.h      | 27 ++++++++++++++++++++++++++
>>   arch/arm64/include/uapi/asm/Kbuild     |  2 --
>>   arch/arm64/include/uapi/asm/kvm_para.h |  5 +++++
>>   3 files changed, 32 insertions(+), 2 deletions(-)
>>   create mode 100644 arch/arm64/include/asm/kvm_para.h
>>   create mode 100644 arch/arm64/include/uapi/asm/kvm_para.h
>>
>> diff --git a/arch/arm64/include/asm/kvm_para.h b/arch/arm64/include/asm/kvm_para.h
>> new file mode 100644
>> index 000000000000..0ea481dd1c7a
>> --- /dev/null
>> +++ b/arch/arm64/include/asm/kvm_para.h
>> @@ -0,0 +1,27 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +#ifndef _ASM_ARM_KVM_PARA_H
>> +#define _ASM_ARM_KVM_PARA_H
>> +
>> +#include <uapi/asm/kvm_para.h>
>> +
>> +static inline bool kvm_check_and_clear_guest_paused(void)
>> +{
>> +	return false;
>> +}
>> +
>> +static inline unsigned int kvm_arch_para_features(void)
>> +{
>> +	return 0;
>> +}
>> +
>> +static inline unsigned int kvm_arch_para_hints(void)
>> +{
>> +	return 0;
>> +}
>> +
>> +static inline bool kvm_para_available(void)
>> +{
>> +	return false;
>> +}
>> +
>> +#endif /* _ASM_ARM_KVM_PARA_H */
>> diff --git a/arch/arm64/include/uapi/asm/Kbuild b/arch/arm64/include/uapi/asm/Kbuild
>> index 602d137932dc..f66554cd5c45 100644
>> --- a/arch/arm64/include/uapi/asm/Kbuild
>> +++ b/arch/arm64/include/uapi/asm/Kbuild
>> @@ -1,3 +1 @@
>>   # SPDX-License-Identifier: GPL-2.0
>> -
>> -generic-y += kvm_para.h
>> diff --git a/arch/arm64/include/uapi/asm/kvm_para.h b/arch/arm64/include/uapi/asm/kvm_para.h
>> new file mode 100644
>> index 000000000000..cd212282b90c
>> --- /dev/null
>> +++ b/arch/arm64/include/uapi/asm/kvm_para.h
>> @@ -0,0 +1,5 @@
>> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
>> +#ifndef _UAPI_ASM_ARM_KVM_PARA_H
>> +#define _UAPI_ASM_ARM_KVM_PARA_H
>> +
>> +#endif /* _UAPI_ASM_ARM_KVM_PARA_H */
>>

Thanks,
Gavin