Re: [PATCH v2] KVM: s390: vsie: fix race during shadow creation

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Am 20.12.23 um 13:53 schrieb Christian Borntraeger:
Right now it is possible to see gmap->private being zero in
kvm_s390_vsie_gmap_notifier resulting in a crash.  This is due to the
fact that we add gmap->private == kvm after creation:

static int acquire_gmap_shadow(struct kvm_vcpu *vcpu,
                                struct vsie_page *vsie_page)
{
[...]
         gmap = gmap_shadow(vcpu->arch.gmap, asce, edat);
         if (IS_ERR(gmap))
                 return PTR_ERR(gmap);
         gmap->private = vcpu->kvm;

Let children inherit the private field of the parent.

Reported-by: Marc Hartmayer <mhartmay@xxxxxxxxxxxxx>
Fixes: a3508fbe9dc6 ("KVM: s390: vsie: initial support for nested virtualization")
Cc: <stable@xxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>

queue on kvms390/master.




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