[PATCH v1] KVM: s390: GISA: sort out physical vs virtual pointers usage

[Nico Boehr <nrb@linux.ibm.com>]

Fix virtual vs physical address confusion (which currently are the same).

In chsc_sgib(), do the virtual-physical conversion in the caller since
the caller needs to make sure it is a 31-bit address and zero has a
special meaning (disassociating the GIB).

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
---
 arch/s390/kvm/interrupt.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index ab569faf0df2..ae018217eac8 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -3104,9 +3104,9 @@ static enum hrtimer_restart gisa_vcpu_kicker(struct hrtimer *timer)
 static void process_gib_alert_list(void)
 {
 	struct kvm_s390_gisa_interrupt *gi;
+	u32 final, gisa_phys, origin = 0UL;
 	struct kvm_s390_gisa *gisa;
 	struct kvm *kvm;
-	u32 final, origin = 0UL;
 
 	do {
 		/*
@@ -3132,9 +3132,10 @@ static void process_gib_alert_list(void)
 		 * interruptions asap.
 		 */
 		while (origin & GISA_ADDR_MASK) {
-			gisa = (struct kvm_s390_gisa *)(u64)origin;
+			gisa_phys = origin;
+			gisa = phys_to_virt(gisa_phys);
 			origin = gisa->next_alert;
-			gisa->next_alert = (u32)(u64)gisa;
+			gisa->next_alert = gisa_phys;
 			kvm = container_of(gisa, struct sie_page2, gisa)->kvm;
 			gi = &kvm->arch.gisa_int;
 			if (hrtimer_active(&gi->timer))
@@ -3418,6 +3419,7 @@ void kvm_s390_gib_destroy(void)
 
 int kvm_s390_gib_init(u8 nisc)
 {
+	u32 gib_origin;
 	int rc = 0;
 
 	if (!css_general_characteristics.aiv) {
@@ -3439,7 +3441,8 @@ int kvm_s390_gib_init(u8 nisc)
 	}
 
 	gib->nisc = nisc;
-	if (chsc_sgib((u32)(u64)gib)) {
+	gib_origin = virt_to_phys(gib);
+	if (chsc_sgib(gib_origin)) {
 		pr_err("Associating the GIB with the AIV facility failed\n");
 		free_page((unsigned long)gib);
 		gib = NULL;
-- 
2.37.3