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Subjectarch/arm64/kvm/va_layout.c:255:6: warning: no previous prototype for 'kvm_get_kimage_voffset'
Hi Marc,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: dbe69e43372212527abf48609aba7fc39a6daa27
commit: 68b824e428c5fb5c3dc5ef80b1543e767534b58e KVM: arm64: Patch kimage_voffset instead of loading the EL1 value
date: 7 months ago
config: arm64-buildonly-randconfig-r002-20210701 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
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/torvalds/linux.git/commit/?id=68b824e428c5fb5c3dc5ef80b1543e767534b58e
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 68b824e428c5fb5c3dc5ef80b1543e767534b58e
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64

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

All warnings (new ones prefixed by >>):

arch/arm64/kvm/va_layout.c:138:6: warning: no previous prototype for 'kvm_patch_vector_branch' [-Wmissing-prototypes]
138 | void kvm_patch_vector_branch(struct alt_instr *alt,
| ^~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/va_layout.c:249:6: warning: no previous prototype for 'kvm_update_kimg_phys_offset' [-Wmissing-prototypes]
249 | void kvm_update_kimg_phys_offset(struct alt_instr *alt,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/arm64/kvm/va_layout.c:255:6: warning: no previous prototype for 'kvm_get_kimage_voffset' [-Wmissing-prototypes]
255 | void kvm_get_kimage_voffset(struct alt_instr *alt,
| ^~~~~~~~~~~~~~~~~~~~~~


vim +/kvm_get_kimage_voffset +255 arch/arm64/kvm/va_layout.c

137
> 138 void kvm_patch_vector_branch(struct alt_instr *alt,
139 __le32 *origptr, __le32 *updptr, int nr_inst)
140 {
141 u64 addr;
142 u32 insn;
143
144 BUG_ON(nr_inst != 5);
145
146 if (has_vhe() || !cpus_have_const_cap(ARM64_HARDEN_EL2_VECTORS)) {
147 WARN_ON_ONCE(cpus_have_const_cap(ARM64_HARDEN_EL2_VECTORS));
148 return;
149 }
150
151 /*
152 * Compute HYP VA by using the same computation as kern_hyp_va()
153 */
154 addr = (uintptr_t)kvm_ksym_ref(__kvm_hyp_vector);
155 addr &= va_mask;
156 addr |= tag_val << tag_lsb;
157
158 /* Use PC[10:7] to branch to the same vector in KVM */
159 addr |= ((u64)origptr & GENMASK_ULL(10, 7));
160
161 /*
162 * Branch over the preamble in order to avoid the initial store on
163 * the stack (which we already perform in the hardening vectors).
164 */
165 addr += KVM_VECTOR_PREAMBLE;
166
167 /* stp x0, x1, [sp, #-16]! */
168 insn = aarch64_insn_gen_load_store_pair(AARCH64_INSN_REG_0,
169 AARCH64_INSN_REG_1,
170 AARCH64_INSN_REG_SP,
171 -16,
172 AARCH64_INSN_VARIANT_64BIT,
173 AARCH64_INSN_LDST_STORE_PAIR_PRE_INDEX);
174 *updptr++ = cpu_to_le32(insn);
175
176 /* movz x0, #(addr & 0xffff) */
177 insn = aarch64_insn_gen_movewide(AARCH64_INSN_REG_0,
178 (u16)addr,
179 0,
180 AARCH64_INSN_VARIANT_64BIT,
181 AARCH64_INSN_MOVEWIDE_ZERO);
182 *updptr++ = cpu_to_le32(insn);
183
184 /* movk x0, #((addr >> 16) & 0xffff), lsl #16 */
185 insn = aarch64_insn_gen_movewide(AARCH64_INSN_REG_0,
186 (u16)(addr >> 16),
187 16,
188 AARCH64_INSN_VARIANT_64BIT,
189 AARCH64_INSN_MOVEWIDE_KEEP);
190 *updptr++ = cpu_to_le32(insn);
191
192 /* movk x0, #((addr >> 32) & 0xffff), lsl #32 */
193 insn = aarch64_insn_gen_movewide(AARCH64_INSN_REG_0,
194 (u16)(addr >> 32),
195 32,
196 AARCH64_INSN_VARIANT_64BIT,
197 AARCH64_INSN_MOVEWIDE_KEEP);
198 *updptr++ = cpu_to_le32(insn);
199
200 /* br x0 */
201 insn = aarch64_insn_gen_branch_reg(AARCH64_INSN_REG_0,
202 AARCH64_INSN_BRANCH_NOLINK);
203 *updptr++ = cpu_to_le32(insn);
204 }
205
206 static void generate_mov_q(u64 val, __le32 *origptr, __le32 *updptr, int nr_inst)
207 {
208 u32 insn, oinsn, rd;
209
210 BUG_ON(nr_inst != 4);
211
212 /* Compute target register */
213 oinsn = le32_to_cpu(*origptr);
214 rd = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RD, oinsn);
215
216 /* movz rd, #(val & 0xffff) */
217 insn = aarch64_insn_gen_movewide(rd,
218 (u16)val,
219 0,
220 AARCH64_INSN_VARIANT_64BIT,
221 AARCH64_INSN_MOVEWIDE_ZERO);
222 *updptr++ = cpu_to_le32(insn);
223
224 /* movk rd, #((val >> 16) & 0xffff), lsl #16 */
225 insn = aarch64_insn_gen_movewide(rd,
226 (u16)(val >> 16),
227 16,
228 AARCH64_INSN_VARIANT_64BIT,
229 AARCH64_INSN_MOVEWIDE_KEEP);
230 *updptr++ = cpu_to_le32(insn);
231
232 /* movk rd, #((val >> 32) & 0xffff), lsl #32 */
233 insn = aarch64_insn_gen_movewide(rd,
234 (u16)(val >> 32),
235 32,
236 AARCH64_INSN_VARIANT_64BIT,
237 AARCH64_INSN_MOVEWIDE_KEEP);
238 *updptr++ = cpu_to_le32(insn);
239
240 /* movk rd, #((val >> 48) & 0xffff), lsl #48 */
241 insn = aarch64_insn_gen_movewide(rd,
242 (u16)(val >> 48),
243 48,
244 AARCH64_INSN_VARIANT_64BIT,
245 AARCH64_INSN_MOVEWIDE_KEEP);
246 *updptr++ = cpu_to_le32(insn);
247 }
248
249 void kvm_update_kimg_phys_offset(struct alt_instr *alt,
250 __le32 *origptr, __le32 *updptr, int nr_inst)
251 {
252 generate_mov_q(kimage_voffset + PHYS_OFFSET, origptr, updptr, nr_inst);
253 }
254
> 255 void kvm_get_kimage_voffset(struct alt_instr *alt,

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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