KVM: arm64: Stop save/restoring host tpidr_el1 on VHE

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Now that a VHE host uses tpidr_el2 for the cpu offset we no longer
need KVM to save/restore tpidr_el1. Move this from the 'common' code
into the non-vhe code. While we're at it, on VHE we don't need to
save the ELR or SPSR as kernel_entry in entry.S will have pushed these
onto the kernel stack, and will restore them from there. Move these
to the non-vhe code as we need them to get back to the host.

Finally remove the always-copy-tpidr we hid in the stage2 setup
code, cpufeature's enable callback will do this for VHE, we only
need KVM to do it for non-vhe. Add the copy into kvm-init instead.

Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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James Morse 2018-01-08 15:38:07 +00:00 • committed by Catalin Marinas

parent 6d99b68933

commit 1f742679c3

3 changed files with 12 additions and 11 deletions

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4

arch/arm64/kvm/hyp-init.S

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3

arch/arm64/kvm/hyp/s2-setup.c

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16

arch/arm64/kvm/hyp/sysreg-sr.c

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