linux-kernel - [PATCH v1 1/1] s390/kvm: mask extra bits from program interrupt code

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Message-ID: <20241031120316.25462-1-imbrenda@linux.ibm.com>
Date: Thu, 31 Oct 2024 13:03:16 +0100
From: Claudio Imbrenda <imbrenda@...ux.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: borntraeger@...ibm.com, nsg@...ux.ibm.com, nrb@...ux.ibm.com,
        frankja@...ux.ibm.com, seiden@...ux.ibm.com, hca@...ux.ibm.com,
        agordeev@...ux.ibm.com, gor@...ux.ibm.com, kvm@...r.kernel.org,
        linux-s390@...r.kernel.org
Subject: [PATCH v1 1/1] s390/kvm: mask extra bits from program interrupt code

The program interrupt code has some extra bits that are sometimes set
by hardware for various reasons; those bits should be ignored when the
program interrupt number is needed for interrupt handling.

Fixes: ce2b276ebe51 ("s390/mm/fault: Handle guest-related program interrupts in KVM")
Reported-by: Christian Borntraeger <borntraeger@...ux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
---
 arch/s390/kvm/kvm-s390.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 8b3afda99397..f2d1351f6992 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -4737,7 +4737,7 @@ static int vcpu_post_run_handle_fault(struct kvm_vcpu *vcpu)
 	if (kvm_s390_cur_gmap_fault_is_write())
 		flags = FAULT_FLAG_WRITE;
 
-	switch (current->thread.gmap_int_code) {
+	switch (current->thread.gmap_int_code & PGM_INT_CODE_MASK) {
 	case 0:
 		vcpu->stat.exit_null++;
 		break;
-- 
2.47.0