Re: [PATCH 3/4] KVM: x86: Omit VCPU_REGS_RIP from emulator's _regs array

[kernel test robot <lkp@intel.com>]

Hi Sean,

I love your patch! Yet something to improve:

[auto build test ERROR on 90bde5bea810d766e7046bf5884f2ccf76dd78e9]

url:    https://github.com/intel-lab-lkp/linux/commits/Sean-Christopherson/KVM-x86-Emulator-_regs-fixes-and-cleanups/20220526-062734
base:   90bde5bea810d766e7046bf5884f2ccf76dd78e9
config: i386-debian-10.3-kselftests (https://download.01.org/0day-ci/archive/20220526/202205261040.m1luL6IW-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/a2e1bffa1b7c8179bed0c28ade24b1a73d7220de
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Sean-Christopherson/KVM-x86-Emulator-_regs-fixes-and-cleanups/20220526-062734
        git checkout a2e1bffa1b7c8179bed0c28ade24b1a73d7220de
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/

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

All errors (new ones prefixed by >>):

   In file included from arch/x86/kvm/x86.h:9,
                    from arch/x86/kvm/cpuid.h:5,
                    from arch/x86/kvm/mmu.h:7,
                    from arch/x86/kvm/x86.c:22:
>> arch/x86/kvm/kvm_emulate.h:310:34: error: 'VCPU_REGS_R15' undeclared here (not in a function); did you mean 'VCPU_REGS_RIP'?
     310 | #define NR_EMULATOR_GPRS        (VCPU_REGS_R15 + 1)
         |                                  ^~~~~~~~~~~~~
   arch/x86/kvm/kvm_emulate.h:374:29: note: in expansion of macro 'NR_EMULATOR_GPRS'
     374 |         unsigned long _regs[NR_EMULATOR_GPRS];
         |                             ^~~~~~~~~~~~~~~~
--
   In file included from arch/x86/kvm/emulate.c:23:
>> arch/x86/kvm/kvm_emulate.h:310:34: error: 'VCPU_REGS_R15' undeclared here (not in a function); did you mean 'VCPU_REGS_RIP'?
     310 | #define NR_EMULATOR_GPRS        (VCPU_REGS_R15 + 1)
         |                                  ^~~~~~~~~~~~~
   arch/x86/kvm/kvm_emulate.h:374:29: note: in expansion of macro 'NR_EMULATOR_GPRS'
     374 |         unsigned long _regs[NR_EMULATOR_GPRS];
         |                             ^~~~~~~~~~~~~~~~
   arch/x86/kvm/emulate.c: In function 'reg_write':
   arch/x86/kvm/emulate.c:268:1: error: control reaches end of non-void function [-Werror=return-type]
     268 | }
         | ^
   arch/x86/kvm/emulate.c: In function 'reg_read':
   arch/x86/kvm/emulate.c:258:1: error: control reaches end of non-void function [-Werror=return-type]
     258 | }
         | ^
   cc1: some warnings being treated as errors
--
   In file included from arch/x86/kvm/vmx/../x86.h:9,
                    from arch/x86/kvm/vmx/../cpuid.h:5,
                    from arch/x86/kvm/vmx/evmcs.c:7:
>> arch/x86/kvm/vmx/../kvm_emulate.h:310:34: error: 'VCPU_REGS_R15' undeclared here (not in a function); did you mean 'VCPU_REGS_RIP'?
     310 | #define NR_EMULATOR_GPRS        (VCPU_REGS_R15 + 1)
         |                                  ^~~~~~~~~~~~~
   arch/x86/kvm/vmx/../kvm_emulate.h:374:29: note: in expansion of macro 'NR_EMULATOR_GPRS'
     374 |         unsigned long _regs[NR_EMULATOR_GPRS];
         |                             ^~~~~~~~~~~~~~~~


vim +310 arch/x86/kvm/kvm_emulate.h

   303	
   304	/*
   305	 * The emulator's _regs array tracks only the GPRs, i.e. excludes RIP.  RIP is
   306	 * tracked/accessed via _eip, and except for RIP relative addressing, which
   307	 * also uses _eip, RIP cannot be a register operand nor can it be an operand in
   308	 * a ModRM or SIB byte.
   309	 */
 > 310	#define NR_EMULATOR_GPRS	(VCPU_REGS_R15 + 1)
   311	

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