linux-kernel - [stable:linux-5.15.y 5373/9027] arch/x86/kvm/hyperv.c:2185:5: warning: stack frame size (1036) exceeds limit (1024) in 'kvm_hv

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Date:   Sun, 14 Aug 2022 20:51:14 +0800
From:   kernel test robot <lkp@...el.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [stable:linux-5.15.y 5373/9027] arch/x86/kvm/hyperv.c:2185:5:
 warning: stack frame size (1036) exceeds limit (1024) in 'kvm_hv_hypercall'

Hi Vitaly,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-5.15.y
head:   7217df81279835a7aee62a07aabb7b8fb8c766f2
commit: cb188e07105f2216f5efbefac95df4b6ce266906 [5373/9027] KVM: x86: hyper-v: HVCALL_SEND_IPI_EX is an XMM fast hypercall
config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20220814/202208142025.NHKErAjq-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 52cd00cabf479aa7eb6dbb063b7ba41ea57bce9e)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=cb188e07105f2216f5efbefac95df4b6ce266906
        git remote add stable https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
        git fetch --no-tags stable linux-5.15.y
        git checkout cb188e07105f2216f5efbefac95df4b6ce266906
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kvm/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> arch/x86/kvm/hyperv.c:2185:5: warning: stack frame size (1036) exceeds limit (1024) in 'kvm_hv_hypercall' [-Wframe-larger-than]
   int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
       ^
   1 warning generated.


vim +/kvm_hv_hypercall +2185 arch/x86/kvm/hyperv.c

4ad81a91119df7 Vitaly Kuznetsov         2021-05-21  2184  
e83d58874ba1de Andrey Smetanin          2015-07-03 @2185  int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
e83d58874ba1de Andrey Smetanin          2015-07-03  2186  {
4e62aa96d6e55c Vitaly Kuznetsov         2021-07-30  2187  	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
bd38b32053eb1c Siddharth Chandrasekaran 2021-05-26  2188  	struct kvm_hv_hcall hc;
bd38b32053eb1c Siddharth Chandrasekaran 2021-05-26  2189  	u64 ret = HV_STATUS_SUCCESS;
e83d58874ba1de Andrey Smetanin          2015-07-03  2190  
e83d58874ba1de Andrey Smetanin          2015-07-03  2191  	/*
e83d58874ba1de Andrey Smetanin          2015-07-03  2192  	 * hypercall generates UD from non zero cpl and real mode
e83d58874ba1de Andrey Smetanin          2015-07-03  2193  	 * per HYPER-V spec
e83d58874ba1de Andrey Smetanin          2015-07-03  2194  	 */
b3646477d458fb Jason Baron              2021-01-14  2195  	if (static_call(kvm_x86_get_cpl)(vcpu) != 0 || !is_protmode(vcpu)) {
e83d58874ba1de Andrey Smetanin          2015-07-03  2196  		kvm_queue_exception(vcpu, UD_VECTOR);
0d9c055eaaf41b Andrey Smetanin          2016-02-11  2197  		return 1;
e83d58874ba1de Andrey Smetanin          2015-07-03  2198  	}
e83d58874ba1de Andrey Smetanin          2015-07-03  2199  

:::::: The code at line 2185 was first introduced by commit
:::::: e83d58874ba1de74c13d3c6b05f95a023c860d25 kvm/x86: move Hyper-V MSR's/hypercall code into hyperv.c file

:::::: TO: Andrey Smetanin <asmetanin@...tuozzo.com>
:::::: CC: Paolo Bonzini <pbonzini@...hat.com>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp