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[GIT,PULL,3/3] KVM: s390: pci: fix virtual-physical confusion on module unload/load

Message ID 20230426125119.11472-4-frankja@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series [GIT,PULL,1/3] KVM: s390: interrupt: fix virtual-physical confusion for next alert GISA | expand

Commit Message

Janosch Frank April 26, 2023, 12:51 p.m. UTC 
From: Nico Boehr <nrb@linux.ibm.com>

When the kvm module is unloaded, zpci_setup_aipb() perists some data in the
zpci_aipb structure in s390 pci code. Note that this struct is also passed
to firmware in the zpci_set_irq_ctrl() call and thus the GAIT must be a
physical address.

On module re-insertion, the GAIT is restored from this structure in
zpci_reset_aipb(). But it is a physical address, hence this may cause
issues when the kvm module is unloaded and loaded again.

Fix virtual vs physical address confusion (which currently are the same) by
adding the necessary physical-to-virtual-conversion in zpci_reset_aipb().

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230222155503.43399-1-nrb@linux.ibm.com
Message-Id: <20230222155503.43399-1-nrb@linux.ibm.com>
---
 arch/s390/kvm/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c
index b124d586db55..7dab00f1e833 100644
--- a/arch/s390/kvm/pci.c
+++ b/arch/s390/kvm/pci.c
@@ -112,7 +112,7 @@  static int zpci_reset_aipb(u8 nisc)
 		return -EINVAL;
 
 	aift->sbv = zpci_aif_sbv;
-	aift->gait = (struct zpci_gaite *)zpci_aipb->aipb.gait;
+	aift->gait = phys_to_virt(zpci_aipb->aipb.gait);
 
 	return 0;
 }