KVM: arm64: Restore S1PIE register visibility to userspace

Upstream Status: RHEL only
JIRA: https://issues.redhat.com/browse/RHEL-89567

Commit 7e64e0b ("[PATCH v2 3/3] KVM: arm64: Hide S1PIE registers from userspace")
broke the migration because it suddently hides PIRE0_EL1 and PIR_EL1
registers from userspace. Let's remove the visibility callback setting
to restore the previous behavior. We don't do a full revert to minimize
conflicts as kvm_has_s1pie is used in many places and the trap setup
plus el2 visibility changes are still sensible from guest point of view.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

Author: eauger

arch/arm64/kvm/sys_regs.c

@@ -2750,10 +2750,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_PMMIR_EL1), trap_raz_wi },
 
 	{ SYS_DESC(SYS_MAIR_EL1), access_vm_reg, reset_unknown, MAIR_EL1 },
-	{ SYS_DESC(SYS_PIRE0_EL1), NULL, reset_unknown, PIRE0_EL1,
-	  .visibility = s1pie_visibility },
-	{ SYS_DESC(SYS_PIR_EL1), NULL, reset_unknown, PIR_EL1,
-	  .visibility = s1pie_visibility },
+	{ SYS_DESC(SYS_PIRE0_EL1), NULL, reset_unknown, PIRE0_EL1 },
+	{ SYS_DESC(SYS_PIR_EL1), NULL, reset_unknown, PIR_EL1 },
 	{ SYS_DESC(SYS_POR_EL1), NULL, reset_unknown, POR_EL1,
 	  .visibility = s1poe_visibility },
 	{ SYS_DESC(SYS_AMAIR_EL1), access_vm_reg, reset_amair_el1, AMAIR_EL1 },