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KVM: s390: pci: Fix handling of AIF enable without AISB

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When a guest seeks to register IRQs without a summary bit specified,
ensure that the associated GAITE then stores 0 for the guest AISB
location instead of virt_to_phys(page_address(NULL)).

Fixes: 3c5a1b6f0a ("KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding")
Cc: stable@vger.kernel.org
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
This commit is contained in:
Matthew Rosato
2026-07-09 09:54:04 -04:00
committed by Christian Borntraeger
parent 9489220fe0
commit 3e3aa6da87
1 changed files with 8 additions and 3 deletions
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11
arch/s390/kvm/pci.c
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@@ -300,9 +300,14 @@ static int kvm_s390_pci_aif_enable(struct zpci_dev *zdev, struct zpci_fib *fib,
gaite->gisc = fib->fmt0.isc;
gaite->count++;
gaite->aisbo = fib->fmt0.aisbo;
gaite->aisb = virt_to_phys(page_address(aisb_page) + (fib->fmt0.aisb &
~PAGE_MASK));
if (fib->fmt0.sum == 1) {
gaite->aisbo = fib->fmt0.aisbo;
gaite->aisb = virt_to_phys(page_address(aisb_page) +
(fib->fmt0.aisb & ~PAGE_MASK));
} else {
gaite->aisbo = 0;
gaite->aisb = 0;
}
aift->kzdev[zdev->aisb] = zdev->kzdev;
spin_unlock_irq(&aift->gait_lock);