arm64: kvm: allows kvm cpu hotplug
authorAKASHI Takahiro <takahiro.akashi@linaro.org>
Wed, 27 Apr 2016 16:47:05 +0000 (17:47 +0100)
committerAlex Shi <alex.shi@linaro.org>
Thu, 17 Nov 2016 01:49:39 +0000 (09:49 +0800)
commit6917fd7ba6367512d24784ba24ff419c6d353f22
treeb3b87f6ce8fe2b74310cee6b78e896fec3bbd137
parent563a1d1db594c7fb84f412b34f8e4b7a4dd8bad2
arm64: kvm: allows kvm cpu hotplug

The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.

This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.

Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
 kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
 added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
 guest-enter after teardown handling]
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from commit 67f6919766620e7ea7aab11a6a3470dc7b451359)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Conflicts:
arch/arm64/include/asm/kvm_host.h
arch/arm/include/asm/kvm_host.h
arch/arm/include/asm/kvm_mmu.h
arch/arm/kvm/arm.c
arch/arm/kvm/mmu.c
arch/arm64/include/asm/kvm_asm.h
arch/arm64/include/asm/kvm_host.h
arch/arm64/include/asm/kvm_mmu.h
arch/arm64/kvm/hyp-init.S
arch/arm64/kvm/reset.c