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| author | Eric Auger <eric.auger@redhat.com> | 2017-10-26 18:23:05 +0300 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2017-10-29 05:25:06 +0300 |
| commit | c9b51bb60d944067f36f67750e19c18c3cc2697c (patch) | |
| tree | 164fc47f98a9839d9d1a852c61337118f611d687 /virt | |
| parent | f31b98b57f72dcd458eb63f795f4efe272acc2e3 (diff) | |
| download | linux-c9b51bb60d944067f36f67750e19c18c3cc2697c.tar.xz | |
KVM: arm/arm64: vgic-its: Check CBASER/BASER validity before enabling the ITS
The spec says it is UNPREDICTABLE to enable the ITS
if any of the following conditions are true:
- GITS_CBASER.Valid == 0.
- GITS_BASER<n>.Valid == 0, for any GITS_BASER<n> register
where the Type field indicates Device.
- GITS_BASER<n>.Valid == 0, for any GITS_BASER<n> register
where the Type field indicates Interrupt Collection and
GITS_TYPER.HCC == 0.
In that case, let's keep the ITS disabled.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reported-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-its.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 6a715a6ec64e..e69ef7d27fde 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -1466,6 +1466,16 @@ static void vgic_mmio_write_its_ctlr(struct kvm *kvm, struct vgic_its *its, { mutex_lock(&its->cmd_lock); + /* + * It is UNPREDICTABLE to enable the ITS if any of the CBASER or + * device/collection BASER are invalid + */ + if (!its->enabled && (val & GITS_CTLR_ENABLE) && + (!(its->baser_device_table & GITS_BASER_VALID) || + !(its->baser_coll_table & GITS_BASER_VALID) || + !(its->cbaser & GITS_CBASER_VALID))) + goto out; + its->enabled = !!(val & GITS_CTLR_ENABLE); /* @@ -1474,6 +1484,7 @@ static void vgic_mmio_write_its_ctlr(struct kvm *kvm, struct vgic_its *its, */ vgic_its_process_commands(kvm, its); +out: mutex_unlock(&its->cmd_lock); } |