KVM: arm64: Prepare to handle deferred save/restore of ELR_EL1
ELR_EL1 is not used by a VHE host kernel and can be deferred, but we need to rework the accesses to this register to access the latest value depending on whether or not guest system registers are loaded on the CPU or only reside in memory. Reviewed-by: NMarc Zyngier <marc.zyngier@arm.com> Reviewed-by: NAndrew Jones <drjones@redhat.com> Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org> Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
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