arm64: KVM: Demote SVE and LORegion warnings to debug only

While generating a message about guests probing for SVE/LORegions
is a useful debugging tool, considering it an error is slightly
over the top, as this is the only way the guest can find out
about the presence of the feature.

Let's turn these message into kvm_debug so that they can only
be seen if CONFIG_DYNAMIC_DEBUG, and kept quiet otherwise.

Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

arch/arm64/kvm/sys_regs.c

@@ -996,14 +996,12 @@ static u64 read_id_reg(struct sys_reg_desc const *r, bool raz)
 
 	if (id == SYS_ID_AA64PFR0_EL1) {
 		if (val & (0xfUL << ID_AA64PFR0_SVE_SHIFT))
-			pr_err_once("kvm [%i]: SVE unsupported for guests, suppressing\n",
-				    task_pid_nr(current));
+			kvm_debug("SVE unsupported for guests, suppressing\n");
 
 		val &= ~(0xfUL << ID_AA64PFR0_SVE_SHIFT);
 	} else if (id == SYS_ID_AA64MMFR1_EL1) {
 		if (val & (0xfUL << ID_AA64MMFR1_LOR_SHIFT))
-			pr_err_once("kvm [%i]: LORegions unsupported for guests, suppressing\n",
-				    task_pid_nr(current));
+			kvm_debug("LORegions unsupported for guests, suppressing\n");
 
 		val &= ~(0xfUL << ID_AA64MMFR1_LOR_SHIFT);
 	}