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KVM: arm64: selftests: Select SMCCC conduit based on current EL

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HVCs are taken within the VM when EL2 is in use. Ensure tests use the
SMC instruction when running at EL2 to interact with the host.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Oliver Upton 2025-09-17 14:20:38 -07:00 committed by Marc Zyngier
parent a1b91ac238
commit d72543ac72
5 changed files with 21 additions and 8 deletions
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2
tools/testing/selftests/kvm/arm64/hypercalls.c
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@ -108,7 +108,7 @@ static void guest_test_hvc(const struct test_hvc_info *hc_info)
for (i = 0; i < hvc_info_arr_sz; i++, hc_info++) {
memset(&res, 0, sizeof(res));
smccc_hvc(hc_info->func_id, hc_info->arg1, 0, 0, 0, 0, 0, 0, &res);
do_smccc(hc_info->func_id, hc_info->arg1, 0, 0, 0, 0, 0, 0, &res);
switch (stage) {
case TEST_STAGE_HVC_IFACE_FEAT_DISABLED:

2
tools/testing/selftests/kvm/arm64/kvm-uuid.c
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@ -25,7 +25,7 @@ static void guest_code(void)
{
struct arm_smccc_res res = {};
smccc_hvc(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, 0, 0, 0, 0, 0, 0, 0, &res);
do_smccc(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, 0, 0, 0, 0, 0, 0, 0, &res);
__GUEST_ASSERT(res.a0 == ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 &&
res.a1 == ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 &&

10
tools/testing/selftests/kvm/arm64/psci_test.c
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@ -27,7 +27,7 @@ static uint64_t psci_cpu_on(uint64_t target_cpu, uint64_t entry_addr,
{
struct arm_smccc_res res;
smccc_hvc(PSCI_0_2_FN64_CPU_ON, target_cpu, entry_addr, context_id,
do_smccc(PSCI_0_2_FN64_CPU_ON, target_cpu, entry_addr, context_id,
0, 0, 0, 0, &res);
return res.a0;
@ -38,7 +38,7 @@ static uint64_t psci_affinity_info(uint64_t target_affinity,
{
struct arm_smccc_res res;
smccc_hvc(PSCI_0_2_FN64_AFFINITY_INFO, target_affinity, lowest_affinity_level,
do_smccc(PSCI_0_2_FN64_AFFINITY_INFO, target_affinity, lowest_affinity_level,
0, 0, 0, 0, 0, &res);
return res.a0;
@ -48,7 +48,7 @@ static uint64_t psci_system_suspend(uint64_t entry_addr, uint64_t context_id)
{
struct arm_smccc_res res;
smccc_hvc(PSCI_1_0_FN64_SYSTEM_SUSPEND, entry_addr, context_id,
do_smccc(PSCI_1_0_FN64_SYSTEM_SUSPEND, entry_addr, context_id,
0, 0, 0, 0, 0, &res);
return res.a0;
@ -58,7 +58,7 @@ static uint64_t psci_system_off2(uint64_t type, uint64_t cookie)
{
struct arm_smccc_res res;
smccc_hvc(PSCI_1_3_FN64_SYSTEM_OFF2, type, cookie, 0, 0, 0, 0, 0, &res);
do_smccc(PSCI_1_3_FN64_SYSTEM_OFF2, type, cookie, 0, 0, 0, 0, 0, &res);
return res.a0;
}
@ -67,7 +67,7 @@ static uint64_t psci_features(uint32_t func_id)
{
struct arm_smccc_res res;
smccc_hvc(PSCI_1_0_FN_PSCI_FEATURES, func_id, 0, 0, 0, 0, 0, 0, &res);
do_smccc(PSCI_1_0_FN_PSCI_FEATURES, func_id, 0, 0, 0, 0, 0, 0, &res);
return res.a0;
}

13
tools/testing/selftests/kvm/include/arm64/processor.h
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@ -359,4 +359,17 @@ static __always_inline u64 ctxt_reg_alias(struct kvm_vcpu *vcpu, u32 encoding)
void kvm_get_default_vcpu_target(struct kvm_vm *vm, struct kvm_vcpu_init *init);
static inline unsigned int get_current_el(void)
{
return (read_sysreg(CurrentEL) >> 2) & 0x3;
}
#define do_smccc(...) \
do { \
if (get_current_el() == 2) \
smccc_smc(__VA_ARGS__); \
else \
smccc_hvc(__VA_ARGS__); \
} while (0)
#endif /* SELFTEST_KVM_PROCESSOR_H */

2
tools/testing/selftests/kvm/steal_time.c
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@ -118,7 +118,7 @@ static int64_t smccc(uint32_t func, uint64_t arg)
{
struct arm_smccc_res res;
smccc_hvc(func, arg, 0, 0, 0, 0, 0, 0, &res);
do_smccc(func, arg, 0, 0, 0, 0, 0, 0, &res);
return res.a0;
}