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| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-10-27 15:28:52 +0100 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2017-11-10 09:44:36 +0100 |
| commit | bd94e7aea40387524b1d6c76b09785f5c3319116 (patch) | |
| tree | 23339b6dab21ef65b4b2091d622305a88352c365 /Documentation | |
| parent | 374be35e231e818ffbdb3f876e2775f22b727e80 (diff) | |
| download | linux-0-day-bd94e7aea40387524b1d6c76b09785f5c3319116.tar.gz linux-0-day-bd94e7aea40387524b1d6c76b09785f5c3319116.tar.xz | |
KVM: arm/arm64: GICv4: Prevent a VM using GICv4 from being saved
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 <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/virtual/kvm/devices/arm-vgic-its.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/arm-vgic-its.txt b/Documentation/virtual/kvm/devices/arm-vgic-its.txt index 8d5830eab26a6..4f0c9fc403656 100644 --- a/Documentation/virtual/kvm/devices/arm-vgic-its.txt +++ b/Documentation/virtual/kvm/devices/arm-vgic-its.txt @@ -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: |