arm64: KVM: Reorder system register restoration and stage-2 activation (1d8cd06a) · Commits · 戴 / test

In order to prepare for handling erratum 1319367, we need to make sure that all system registers (and most importantly the registers configuring the virtual memory) are set before we enable stage-2 translation. This results in a minor reorganisation of the load sequence, without any functional change. Reviewed-by:

James Morse <james.morse@arm.com> Signed-off-by:

Marc Zyngier <maz@kernel.org>

arch/arm64/kvm/hyp/switch.c

+11 −6

Original line number	Diff line number	Diff line
		@@ -605,18 +605,23 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu)

		__sysreg_save_state_nvhe(host_ctxt);

		__activate_vm(kern_hyp_va(vcpu->kvm));
		__activate_traps(vcpu);

		__hyp_vgic_restore_state(vcpu);
		__timer_enable_traps(vcpu);

		/*
		* We must restore the 32-bit state before the sysregs, thanks
		* to erratum #852523 (Cortex-A57) or #853709 (Cortex-A72).
		*
		* Also, and in order to be able to deal with erratum #1319537 (A57)
		* and #1319367 (A72), we must ensure that all VM-related sysreg are
		* restored before we enable S2 translation.
		*/
		__sysreg32_restore_state(vcpu);
		__sysreg_restore_state_nvhe(guest_ctxt);

		__activate_vm(kern_hyp_va(vcpu->kvm));
		__activate_traps(vcpu);

		__hyp_vgic_restore_state(vcpu);
		__timer_enable_traps(vcpu);

		__debug_switch_to_guest(vcpu);

		__set_guest_arch_workaround_state(vcpu);

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