KVM: arm64: selftests: Filter ZCR_EL2 in get-reg-list

get-reg-list includes ZCR_EL2 in the list of EL2 registers that it looks
for when NV is enabled but does not have any feature gate for this register,
meaning that testing any combination of features that includes EL2 but does
not include SVE will result in a test failure due to a missing register
being reported:

| The following lines are missing registers:
|
|	ARM64_SYS_REG(3, 4, 1, 2, 0),

Add ZCR_EL2 to feat_id_regs so that the test knows not to expect to see it
without SVE being enabled.

Fixes: 3a90b6f ("KVM: arm64: selftests: get-reg-list: Add base EL2 registers")
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20251024-kvm-arm64-get-reg-list-zcr-el2-v1-1-0cd0ff75e22f@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

Author: broonie

tools/testing/selftests/kvm/arm64/get-reg-list.c

@@ -69,6 +69,7 @@ static struct feature_id_reg feat_id_regs[] = {
 	REG_FEAT(VNCR_EL2,	ID_AA64MMFR4_EL1, NV_frac, NV2_ONLY),
 	REG_FEAT(CNTHV_CTL_EL2, ID_AA64MMFR1_EL1, VH, IMP),
 	REG_FEAT(CNTHV_CVAL_EL2,ID_AA64MMFR1_EL1, VH, IMP),
+	REG_FEAT(ZCR_EL2,	ID_AA64PFR0_EL1, SVE, IMP),
 };
 
 bool filter_reg(__u64 reg)