kernel test robot <lkp@xxxxxxxxx> writes:
In file included from arch/arm64/include/asm/kvm_host.h:32,
from include/linux/kvm_host.h:45,
from arch/arm64/kvm/sys_regs.c:16:
arch/arm64/include/asm/kvm_pmu.h:236:50: warning: 'struct arm_pmu'
declared inside parameter list will not be visible outside of this
definition or declaration
static inline bool kvm_pmu_is_partitioned(struct arm_pmu *pmu)
^~~~~~~
arch/arm64/include/asm/kvm_pmu.h:241:52: warning: 'struct arm_pmu'
declared inside parameter list will not be visible outside of this
definition or declaration
static inline u64 kvm_pmu_host_counter_mask(struct arm_pmu *pmu)
^~~~~~~
arch/arm64/include/asm/kvm_pmu.h:246:53: warning: 'struct arm_pmu'
declared inside parameter list will not be visible outside of this
definition or declaration
static inline u64 kvm_pmu_guest_counter_mask(struct arm_pmu *pmu)
^~~~~~~
arch/arm64/kvm/sys_regs.c:856:6: warning: no previous prototype
for 'pmu_access_el0_disabled' [-Wmissing-prototypes]
bool pmu_access_el0_disabled(struct kvm_vcpu *vcpu)
^~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/sys_regs.c: In function 'access_pmu_evtyper':
arch/arm64/kvm/sys_regs.c:1076:7: error: implicit declaration of
function 'kvm_vcpu_pmu_is_partitioned'; did you
mean 'kvm_pmu_is_partitioned'? [-Werror=implicit-function-declaration]
if (kvm_vcpu_pmu_is_partitioned(vcpu))
^~~~~~~~~~~~~~~~~~~~~~~~~~~
kvm_pmu_is_partitioned
arch/arm64/kvm/sys_regs.c: In function 'set_pmcr':
arch/arm64/kvm/sys_regs.c:1271:33: error: dereferencing pointer to
incomplete type 'struct arm_pmu'
new_n <= kvm->arch.arm_pmu->hpmn_max))
^~
cc1: some warnings being treated as errors
Looks like the main problem here is struct arm_pmu is not defined if we
don't have CONFIG_ARM_PMU. I'll provide a dummy definition for that case
and swap out the field reference for a function call.
Secondary problem is making sure there is a prototype for
pmu_access_el0_disabled in that instance.
vim +1271 arch/arm64/kvm/sys_regs.c
1253
1254 static int set_pmcr(struct kvm_vcpu *vcpu, const struct
sys_reg_desc *r,
1255 u64 val)
1256 {
1257 u8 new_n = FIELD_GET(ARMV8_PMU_PMCR_N, val);
1258 struct kvm *kvm = vcpu->kvm;
1259
1260 mutex_lock(&kvm->arch.config_lock);
1261
1262 /*
1263 * The vCPU can't have more counters than the PMU hardware
1264 * implements. Ignore this error to maintain compatibility
1265 * with the existing KVM behavior.
1266 */
1267 if (!kvm_vm_has_ran_once(kvm) &&
1268 !vcpu_has_nv(vcpu) &&
1269 new_n <= kvm_arm_pmu_get_max_counters(kvm) &&
1270 (!kvm_vcpu_pmu_is_partitioned(vcpu) ||
1271 new_n <= kvm->arch.arm_pmu->hpmn_max))
1272 kvm->arch.nr_pmu_counters = new_n;
1273
1274 mutex_unlock(&kvm->arch.config_lock);
1275
1276 /*
1277 * Ignore writes to RES0 bits, read only bits that are cleared on
1278 * vCPU reset, and writable bits that KVM doesn't support yet.
1279 * (i.e. only PMCR.N and bits [7:0] are mutable from userspace)
1280 * The LP bit is RES0 when FEAT_PMUv3p5 is not supported on the
vCPU.
1281 * But, we leave the bit as it is here, as the vCPU's PMUver might
1282 * be changed later (NOTE: the bit will be cleared on first vCPU
run
1283 * if necessary).
1284 */
1285 val &= ARMV8_PMU_PMCR_MASK;
1286
1287 /* The LC bit is RES1 when AArch32 is not supported */
1288 if (!kvm_supports_32bit_el0())
1289 val |= ARMV8_PMU_PMCR_LC;
1290
1291 __vcpu_assign_sys_reg(vcpu, r->reg, val);
1292 kvm_make_request(KVM_REQ_RELOAD_PMU, vcpu);
1293
1294 return 0;
1295 }
1296
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