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

kernel test robot
2024-09-04T09:37:10Z

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@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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