Re: [PATCH v4 02/17] x86/acrn: Introduce acrn_{setup, remove}_intr_handler()

From: Shuo A Liu <shuo.a.liu@intel.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
	"H . Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Yu Wang <yu1.wang@intel.com>,
	Reinette Chatre <reinette.chatre@intel.com>,
	Yakui Zhao <yakui.zhao@intel.com>,
	Zhi Wang <zhi.a.wang@intel.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Fengwei Yin <fengwei.yin@intel.com>,
	Zhenyu Wang <zhenyuw@linux.intel.com>
Subject: Re: [PATCH v4 02/17] x86/acrn: Introduce acrn_{setup, remove}_intr_handler()
Date: Mon, 28 Sep 2020 11:28:31 +0800	[thread overview]
Message-ID: <20200928032804.GA1057@shuo-intel.sh.intel.com> (raw)
In-Reply-To: <20200927104943.GF88650@kroah.com>

On Sun 27.Sep'20 at 12:49:43 +0200, Greg Kroah-Hartman wrote:
>On Tue, Sep 22, 2020 at 07:42:56PM +0800, shuo.a.liu@intel.com wrote:
>> From: Shuo Liu <shuo.a.liu@intel.com>
>>
>> The ACRN Hypervisor builds an I/O request when a trapped I/O access
>> happens in User VM. Then, ACRN Hypervisor issues an upcall by sending
>> a notification interrupt to the Service VM. HSM in the Service VM needs
>> to hook the notification interrupt to handle I/O requests.
>>
>> Notification interrupts from ACRN Hypervisor are already supported and
>> a, currently uninitialized, callback called.
>>
>> Export two APIs for HSM to setup/remove its callback.
>>
>> Originally-by: Yakui Zhao <yakui.zhao@intel.com>
>> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
>> Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
>> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
>> Cc: Dave Hansen <dave.hansen@intel.com>
>> Cc: Sean Christopherson <sean.j.christopherson@intel.com>
>> Cc: Dan Williams <dan.j.williams@intel.com>
>> Cc: Fengwei Yin <fengwei.yin@intel.com>
>> Cc: Zhi Wang <zhi.a.wang@intel.com>
>> Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
>> Cc: Yu Wang <yu1.wang@intel.com>
>> Cc: Reinette Chatre <reinette.chatre@intel.com>
>> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> ---
>>  arch/x86/include/asm/acrn.h |  8 ++++++++
>>  arch/x86/kernel/cpu/acrn.c  | 16 ++++++++++++++++
>>  2 files changed, 24 insertions(+)
>>  create mode 100644 arch/x86/include/asm/acrn.h
>>
>> diff --git a/arch/x86/include/asm/acrn.h b/arch/x86/include/asm/acrn.h
>> new file mode 100644
>> index 000000000000..ff259b69cde7
>> --- /dev/null
>> +++ b/arch/x86/include/asm/acrn.h
>> @@ -0,0 +1,8 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +#ifndef _ASM_X86_ACRN_H
>> +#define _ASM_X86_ACRN_H
>> +
>> +void acrn_setup_intr_handler(void (*handler)(void));
>> +void acrn_remove_intr_handler(void);
>> +
>> +#endif /* _ASM_X86_ACRN_H */
>> diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c
>> index 0b2c03943ac6..42e88d01ccf9 100644
>> --- a/arch/x86/kernel/cpu/acrn.c
>> +++ b/arch/x86/kernel/cpu/acrn.c
>> @@ -9,7 +9,11 @@
>>   *
>>   */
>>
>> +#define pr_fmt(fmt) "acrn: " fmt
>
>Why is this needed, if you are not adding pr_* calls in this patch?

True. I will remove it. Thanks.