[PATCH v2] x86/sev: Fix host kdump support for SNP

[kernel test robot]

Hi Ashish,

kernel test robot noticed the following build warnings:

[auto build test WARNING on kvm/queue]
[also build test WARNING on linus/master v6.11-rc6 next-20240904]
[cannot apply to kvm/linux-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ashish-Kalra/x86-sev-Fix-host-kdump-support-for-SNP/20240904-031215
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
patch link:    https://lore.kernel.org/r/20240903191033.28365-1-Ashish.Kalra%40amd.com
patch subject: [PATCH v2] x86/sev: Fix host kdump support for SNP
config: x86_64-randconfig-r073-20240904 (https://download.01.org/0day-ci/archive/20240904/202409041737.FSl6a7vH-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240904/202409041737.FSl6a7vH-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409041737.FSl6a7vH-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/x86/kvm/kvm-asm-offsets.c:11:
>> arch/x86/kvm/svm/svm.h:783:13: warning: 'sev_emergency_disable' defined but not used [-Wunused-function]
     783 | static void sev_emergency_disable(void) {}
         |             ^~~~~~~~~~~~~~~~~~~~~


vim +/sev_emergency_disable +783 arch/x86/kvm/svm/svm.h

   763	
   764	static inline void sev_free_vcpu(struct kvm_vcpu *vcpu) {}
   765	static inline void sev_vm_destroy(struct kvm *kvm) {}
   766	static inline void __init sev_set_cpu_caps(void) {}
   767	static inline void __init sev_hardware_setup(void) {}
   768	static inline void sev_hardware_unsetup(void) {}
   769	static inline int sev_cpu_init(struct svm_cpu_data *sd) { return 0; }
   770	static inline int sev_dev_get_attr(u32 group, u64 attr, u64 *val) { return -ENXIO; }
   771	#define max_sev_asid 0
   772	static inline void sev_handle_rmp_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u64 error_code) {}
   773	static inline void sev_snp_init_protected_guest_state(struct kvm_vcpu *vcpu) {}
   774	static inline int sev_gmem_prepare(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn, int max_order)
   775	{
   776		return 0;
   777	}
   778	static inline void sev_gmem_invalidate(kvm_pfn_t start, kvm_pfn_t end) {}
   779	static inline int sev_private_max_mapping_level(struct kvm *kvm, kvm_pfn_t pfn)
   780	{
   781		return 0;
   782	}
 > 783	static void sev_emergency_disable(void) {}
   784	#endif
   785	

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