linux-kernel - Re: [PATCH v9 17/18] virt: acrn: Introduce an interface for Service VM to control vCPU

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Date:   Wed, 3 Mar 2021 18:37:19 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     shuo.a.liu@...el.com
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Yu Wang <yu1.wang@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>
Subject: Re: [PATCH v9 17/18] virt: acrn: Introduce an interface for Service
 VM to control vCPU

On Sun, Feb 07, 2021 at 11:10:39AM +0800, shuo.a.liu@...el.com wrote:
> From: Shuo Liu <shuo.a.liu@...el.com>
> 
> ACRN supports partition mode to achieve real-time requirements. In
> partition mode, a CPU core can be dedicated to a vCPU of User VM. The
> local APIC of the dedicated CPU core can be passthrough to the User VM.
> The Service VM controls the assignment of the CPU cores.
> 
> Introduce an interface for the Service VM to remove the control of CPU
> core from hypervisor perspective so that the CPU core can be a dedicated
> CPU core of User VM.
> 
> 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: 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>
> ---
>  drivers/virt/acrn/hsm.c       | 48 +++++++++++++++++++++++++++++++++++
>  drivers/virt/acrn/hypercall.h | 14 ++++++++++
>  2 files changed, 62 insertions(+)

This one causes:

drivers/virt/acrn/hsm.c: In function ‘remove_cpu_store’:
drivers/virt/acrn/hsm.c:389:3: error: implicit declaration of function ‘remove_cpu’; did you mean ‘register_cpu’? [-Werror=implicit-function-declaration]
   remove_cpu(cpu);
   ^~~~~~~~~~
   register_cpu
drivers/virt/acrn/hsm.c:402:2: error: implicit declaration of function ‘add_cpu’; did you mean ‘task_cpu’? [-Werror=implicit-function-declaration]
  add_cpu(cpu);
  ^~~~~~~
  task_cpu
cc1: some warnings being treated as errors
make[3]: *** [scripts/Makefile.build:271: drivers/virt/acrn/hsm.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [scripts/Makefile.build:514: drivers/virt/acrn] Error 2
make[1]: *** [scripts/Makefile.build:514: drivers/virt] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:1849: drivers] Error 2

with the attached config.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

View attachment "16-04-34-randconfig-x86_64-29041.cfg" of type "text/plain" (160980 bytes)