ARM: plat-versatile: move secondary CPU startup out of .init.
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| Patch | Claudio Fontana |
|---|---|
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Cover letter [PATCH 0/1 RESEND 2] ARM: plat-versatile: move secondary CPU startup out of .init.
Hello,
I am implementing virtual CPU hotplug for the the ARM Cortex A-15 VExpress motherboard. This is mainly a QEMU feature, which allows dynamically changing the number of CPUs in the guest.
I stumbled upon a limitation in the kernel support for plat-versatile, which contains the secondary CPU startup code for the VExpress.
Basically, the secondary CPU startup code is preceded by the macro __INIT, which causes the code to be freed in free_initmem() during kernel_init().
This means that any attempt at hot-booting CPUs in the guest results in VCPUs jumping to a memory address that was freed, after which the VCPU behaves erratically, as can be expected.
With this patch applied, we use __CPUINIT instead of __INIT, so that the right thing happens:
under CONFIG_HOTPLUG_CPU, the secondary CPU startup code is not freed, the secondary VCPUs start successfully, and it's all gardens and blue skies.
Tested successfully using the ARM fast models for the Cortex-A15.
--
Claudio Fontana (1):
ARM: plat-versatile: move secondary CPU startup code out of .init.
arch/arm/plat-versatile/headsmp.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
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1.7.12.1