Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH v6 3/4] x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN
 guest upcall vector
To:     Borislav Petkov <bp@alien8.de>
Cc:     linux-kernel@vger.kernel.org, x86@kernel.org, tglx@linutronix.de,
        Jason Chen CJ <jason.cj.chen@intel.com>
References: <1556595926-17910-1-git-send-email-yakui.zhao@intel.com>
 <1556595926-17910-4-git-send-email-yakui.zhao@intel.com>
 <20190515172356.GL24212@zn.tnic>
From:   "Zhao, Yakui" <yakui.zhao@intel.com>
Message-ID: <27c20325-61b7-994f-2781-f4bc41badc6f@intel.com>
Date:   Mon, 27 May 2019 10:21:20 +0800
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.6.0
MIME-Version: 1.0
In-Reply-To: <20190515172356.GL24212@zn.tnic>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


On 2019年05月16日 01:23, Borislav Petkov wrote:
> On Tue, Apr 30, 2019 at 11:45:25AM +0800, Zhao Yakui wrote:
>> @@ -30,6 +36,29 @@ static bool acrn_x2apic_available(void)
>>   	return false;
>>   }
>>   
>> +static void (*acrn_intr_handler)(void);
>> +
>> +__visible void __irq_entry acrn_hv_vector_handler(struct pt_regs *regs)
>> +{
>> +	struct pt_regs *old_regs = set_irq_regs(regs);
>> +
>> +	/*
>> +	 * The hypervisor requires that the APIC EOI should be acked.
>> +	 * If the APIC EOI is not acked, the APIC ISR bit for the
>> +	 * HYPERVISOR_CALLBACK_VECTOR will not be cleared and then it
>> +	 * will block the interrupt whose vector is lower than
>> +	 * HYPERVISOR_CALLBACK_VECTOR.
>> +	 */
>> +	entering_ack_irq();

Sorry for the late response.

You are right. The "asm/apic.h" is missing.
It will be added.
Very sorry that this issue is not triggered as the used .config in my 
test doesn't enable the check of "-Werror=implict-function-declaration".

> 
> arch/x86/kernel/cpu/acrn.c: In function ‘acrn_hv_vector_handler’:
> arch/x86/kernel/cpu/acrn.c:52:2: error: implicit declaration of function ‘entering_ack_irq’; did you mean ‘spin_lock_irq’? [-Werror=implicit-function-declaration]
>    entering_ack_irq();
>    ^~~~~~~~~~~~~~~~
>    spin_lock_irq
> arch/x86/kernel/cpu/acrn.c:58:2: error: implicit declaration of function ‘exiting_irq’; did you mean ‘in_irq’? [-Werror=implicit-function-declaration]
>    exiting_irq();
>    ^~~~~~~~~~~
>    in_irq
> cc1: some warnings being treated as errors
> make[3]: *** [scripts/Makefile.build:278: arch/x86/kernel/cpu/acrn.o] Error 1
> make[3]: *** Waiting for unfinished jobs....
> make[2]: *** [scripts/Makefile.build:489: arch/x86/kernel/cpu] Error 2
> make[1]: *** [scripts/Makefile.build:489: arch/x86/kernel] Error 2
> make: *** [Makefile:1073: arch/x86] Error 2
> make: *** Waiting for unfinished jobs....
> 
> Looks like it needs
> 
> +#include <asm/apic.h>
> 
> config attached.
>