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author | Oliver Upton <oliver.upton@linux.dev> | 2024-02-19 21:58:06 +0300 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2024-02-21 23:11:20 +0300 |
commit | ec4308ecfc887128a468f03fb66b767559c57c23 (patch) | |
tree | 5578f84bf9385d71fe9dedeecded9338c2744ac3 /arch/x86/include/asm | |
parent | fb33a46cd75e18773dd5a414744507d84ae90870 (diff) | |
download | linux-ec4308ecfc887128a468f03fb66b767559c57c23.tar.xz |
irqchip/gic-v3-its: Do not assume vPE tables are preallocated
The GIC/ITS code is designed to ensure to pick up any preallocated LPI
tables on the redistributors, as enabling LPIs is a one-way switch. There
is no such restriction for vLPIs, and for GICv4.1 it is expected to
allocate a new vPE table at boot.
This works as intended when initializing an ITS, however when setting up a
redistributor in cpu_init_lpis() the early return for preallocated RD
tables skips straight past the GICv4 setup. This all comes to a head when
trying to kexec() into a new kernel, as the new kernel silently fails to
set up GICv4, leading to a complete loss of SGIs and LPIs for KVM VMs.
Slap a band-aid on the problem by ensuring its_cpu_init_lpis() always
initializes GICv4 on the way out, even if the other RD tables were
preallocated.
Fixes: 6479450f72c1 ("irqchip/gic-v4: Fix occasional VLPI drop")
Reported-by: George Cherian <gcherian@marvell.com>
Co-developed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240219185809.286724-2-oliver.upton@linux.dev
Diffstat (limited to 'arch/x86/include/asm')
0 files changed, 0 insertions, 0 deletions