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| author | Marc Zyngier <maz@kernel.org> | 2022-01-24 16:38:09 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-01-26 14:10:28 +0300 |
| commit | c733ebb7cb67dfb146a07c0ae329a0de9ec52f36 (patch) | |
| tree | 14c74e8d3462114d40faef82b9205cf4d53bde60 /Documentation | |
| parent | 16436f70abeebb29cd99444e27b310755806c1fa (diff) | |
| download | linux-c733ebb7cb67dfb146a07c0ae329a0de9ec52f36.tar.xz | |
irqchip/gic-v3-its: Reset each ITS's BASERn register before probe
A recent bug report outlined that the way GICv4.1 is handled across
kexec is pretty bad. We can end-up in a situation where ITSs share
memory (this is the case when SVPET==1) and reprogram the base
registers, creating a situation where ITSs that are part of a given
affinity group see different pointers. Which is illegal. Boo.
In order to restore some sanity, reset the BASERn registers to 0
*before* probing any ITS. Although this isn't optimised at all,
this is only a once-per-boot cost, which shouldn't show up on
anyone's radar.
Cc: Jay Chen <jkchen@linux.alibaba.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Link: https://lore.kernel.org/r/20211216190315.GA14220@lpieralisi
Link: https://lore.kernel.org/r/20220124133809.1291195-1-maz@kernel.org
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions