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KVM: arm/arm64: GICv4: Prevent a VM using GICv4 from being saved

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The GICv4 architecture doesn't make it easy for save/restore to
work, as it doesn't give any guarantee that the pending state
is written into the pending table.

So let's not take any chance, and let's return an error if
we encounter any LPI that has the HW bit set. In order for
userspace to distinguish this error from other failure modes,
use -EACCES as an error code.

Reviewed-by: Eric Auger <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
This commit is contained in:
Marc Zyngier 2017-10-27 15:28:52 +01:00 • committed by Christoffer Dall
commit bd94e7aea4
2 changed files with 11 additions and 0 deletions
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9
virt/kvm/arm/vgic/vgic-its.c
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@ -1995,6 +1995,15 @@ static int vgic_its_save_itt(struct vgic_its *its, struct its_device *device)
list_for_each_entry(ite, &device->itt_head, ite_list) {
gpa_t gpa = base + ite->event_id * ite_esz;
/*
* If an LPI carries the HW bit, this means that this
* interrupt is controlled by GICv4, and we do not
* have direct access to that state. Let's simply fail
* the save operation...
*/
if (ite->irq->hw)
return -EACCES;
ret = vgic_its_save_ite(its, device, ite, gpa, ite_esz);
if (ret)
return ret;