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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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2
Documentation/virtual/kvm/devices/arm-vgic-its.txt
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@ -64,6 +64,8 @@ Groups:
-EINVAL: Inconsistent restored data
-EFAULT: Invalid guest ram access
-EBUSY: One or more VCPUS are running
-EACCES: The virtual ITS is backed by a physical GICv4 ITS, and the
state is not available
KVM_DEV_ARM_VGIC_GRP_ITS_REGS
Attributes: