KVM: PPC: Book3S 64: Minimise hcall handler calling convention differences

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This sets up the same calling convention from interrupt entry to
KVM interrupt handler for system calls as exists for other interrupt
types.

This is a better API, it uses a save area rather than SPR, and it has
more registers free to use. Using a single common API helps maintain
it, and it becomes easier to use in C in a later patch.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210528090752.3542186-8-npiggin@gmail.com

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Nicholas Piggin 2021-05-28 19:07:27 +10:00 • committed by Michael Ellerman

parent 1b5821c630

commit e2762743c6

2 changed files with 45 additions and 37 deletions

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21

arch/powerpc/kernel/exceptions-64s.S

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61

arch/powerpc/kvm/book3s_64_entry.S

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