linux-kernel - Re: [PATCH v6 3/4] x86/acrn: Use HYPERVISOR_CALLBACK

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Date:   Mon, 27 May 2019 10:21:20 +0800
From:   "Zhao, Yakui" <yakui.zhao@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
        Jason Chen CJ <jason.cj.chen@...el.com>
Subject: Re: [PATCH v6 3/4] x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN
 guest upcall vector



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.
>