linux-kernel - Re: [PATCH v4 02/17] x86/acrn: Introduce acrn_{setup, remove}_intr

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Message-ID: <20200928032804.GA1057@shuo-intel.sh.intel.com>
Date:   Mon, 28 Sep 2020 11:28:31 +0800
From:   Shuo A Liu <shuo.a.liu@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Yu Wang <yu1.wang@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Yakui Zhao <yakui.zhao@...el.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Fengwei Yin <fengwei.yin@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>
Subject: Re: [PATCH v4 02/17] x86/acrn: Introduce acrn_{setup,
 remove}_intr_handler()

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@...el.com wrote:
>> From: Shuo Liu <shuo.a.liu@...el.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@...el.com>
>> Signed-off-by: Shuo Liu <shuo.a.liu@...el.com>
>> Reviewed-by: Zhi Wang <zhi.a.wang@...el.com>
>> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
>> Cc: Dave Hansen <dave.hansen@...el.com>
>> Cc: Sean Christopherson <sean.j.christopherson@...el.com>
>> Cc: Dan Williams <dan.j.williams@...el.com>
>> Cc: Fengwei Yin <fengwei.yin@...el.com>
>> Cc: Zhi Wang <zhi.a.wang@...el.com>
>> Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>
>> Cc: Yu Wang <yu1.wang@...el.com>
>> Cc: Reinette Chatre <reinette.chatre@...el.com>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.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.