KVM: arm/arm64: Add kvm_vcpu_load_sysregs and kvm_vcpu_put_sysregs
As we are about to move a bunch of save/restore logic for VHE kernels to the load and put functions, we need some infrastructure to do this. Reviewed-by: Andrew Jones <drjones@redhat.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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Marc Zyngier

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commit
bc192ceec3
@@ -190,6 +190,36 @@ void __hyp_text __sysreg32_restore_state(struct kvm_vcpu *vcpu)
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write_sysreg(sysreg[DBGVCR32_EL2], dbgvcr32_el2);
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}
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/**
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* kvm_vcpu_load_sysregs - Load guest system registers to the physical CPU
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*
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* @vcpu: The VCPU pointer
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*
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* Load system registers that do not affect the host's execution, for
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* example EL1 system registers on a VHE system where the host kernel
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* runs at EL2. This function is called from KVM's vcpu_load() function
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* and loading system register state early avoids having to load them on
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* every entry to the VM.
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*/
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void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu)
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{
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}
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/**
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* kvm_vcpu_put_sysregs - Restore host system registers to the physical CPU
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*
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* @vcpu: The VCPU pointer
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*
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* Save guest system registers that do not affect the host's execution, for
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* example EL1 system registers on a VHE system where the host kernel
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* runs at EL2. This function is called from KVM's vcpu_put() function
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* and deferring saving system register state until we're no longer running the
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* VCPU avoids having to save them on every exit from the VM.
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*/
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void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu)
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{
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}
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void __hyp_text __kvm_set_tpidr_el2(u64 tpidr_el2)
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{
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asm("msr tpidr_el2, %0": : "r" (tpidr_el2));
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