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author | Vladimir Murzin <vladimir.murzin@arm.com> | 2014-09-22 15:52:48 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-03 19:49:06 -0700 |
commit | 42846f9b74fdb743c0ed4be08dc67365f98a81d4 (patch) | |
tree | 268a8e92705c3667e74aadd471c4c98645fb0a0f /arch/arm/kvm/mmu.c | |
parent | 70d011e1c968dd17bbf497c4b72dbf897278fad8 (diff) |
arm: kvm: fix CPU hotplug
commit 37a34ac1d4775aafbc73b9db53c7daebbbc67e6a upstream.
On some platforms with no power management capabilities, the hotplug
implementation is allowed to return from a smp_ops.cpu_die() call as a
function return. Upon a CPU onlining event, the KVM CPU notifier tries
to reinstall the hyp stub, which fails on platform where no reset took
place following a hotplug event, with the message:
CPU1: smp_ops.cpu_die() returned, trying to resuscitate
CPU1: Booted secondary processor
Kernel panic - not syncing: unexpected prefetch abort in Hyp mode at: 0x80409540
unexpected data abort in Hyp mode at: 0x80401fe8
unexpected HVC/SVC trap in Hyp mode at: 0x805c6170
since KVM code is trying to reinstall the stub on a system where it is
already configured.
To prevent this issue, this patch adds a check in the KVM hotplug
notifier that detects if the HYP stub really needs re-installing when a
CPU is onlined and skips the installation call if the stub is already in
place, which means that the CPU has not been reset.
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/kvm/mmu.c')
0 files changed, 0 insertions, 0 deletions