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arm64: Add back cpu reset routines

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Commit 68234df4ea ("arm64: kill flush_cache_all()") removed the global
arm64 routines cpu_reset() and cpu_soft_restart() needed by the arm64
kexec and kdump support.  Add back a simplified version of
cpu_soft_restart() with some changes needed for kexec in the new files
cpu_reset.S, and cpu_reset.h.

When a CPU is reset it needs to be put into the exception level it had when
it entered the kernel. Update cpu_soft_restart() to accept an argument
which signals if the reset address should be entered at EL1 or EL2, and
add a new hypercall HVC_SOFT_RESTART which is used for the EL2 switch.

Signed-off-by: Geoff Levand <geoff@infradead.org>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Geoff Levand
2016-06-23 17:54:48 +00:00
committed by Catalin Marinas
parent b69e0dc14c
commit f9076ecfb1
4 changed files with 102 additions and 1 deletions
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10
arch/arm64/kernel/hyp-stub.S
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@@ -71,8 +71,16 @@ el1_sync:
msr vbar_el2, x1
b 9f
2: cmp x0, #HVC_SOFT_RESTART
b.ne 3f
mov x0, x2
mov x2, x4
mov x4, x1
mov x1, x3
br x4 // no return
/* Someone called kvm_call_hyp() against the hyp-stub... */
2: mov x0, #ARM_EXCEPTION_HYP_GONE
3: mov x0, #ARM_EXCEPTION_HYP_GONE
9: eret
ENDPROC(el1_sync)