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KVM: arm/arm64: Handle VGICv3 save/restore from the main VGIC code on VHE

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Just like we can program the GICv2 hypervisor control interface directly
from the core vgic code, we can do the same for the GICv3 hypervisor
control interface on VHE systems.

We do this by simply calling the save/restore functions when we have VHE
and we can then get rid of the save/restore function calls from the VHE
world switch function.

One caveat is that we now write GICv3 system register state before the
potential early exit path in the run loop, and because we sync back
state in the early exit path, we have to ensure that we read a
consistent GIC state from the sync path, even though we have never
actually run the guest with the newly written GIC state.  We solve this
by inserting an ISB in the early exit path.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Christoffer Dall
2017-10-04 23:42:32 +02:00
committed by Marc Zyngier
parent 8a43a2b34b
commit 771621b0e2
3 changed files with 26 additions and 9 deletions
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13
arch/arm64/kvm/hyp/switch.c
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@@ -192,13 +192,15 @@ static void __hyp_text __deactivate_vm(struct kvm_vcpu *vcpu)
write_sysreg(0, vttbr_el2);
}
static void __hyp_text __vgic_save_state(struct kvm_vcpu *vcpu)
/* Save VGICv3 state on non-VHE systems */
static void __hyp_text __hyp_vgic_save_state(struct kvm_vcpu *vcpu)
{
if (static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
__vgic_v3_save_state(vcpu);
}
static void __hyp_text __vgic_restore_state(struct kvm_vcpu *vcpu)
/* Restore VGICv3 state on non_VEH systems */
static void __hyp_text __hyp_vgic_restore_state(struct kvm_vcpu *vcpu)
{
if (static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
__vgic_v3_restore_state(vcpu);
@@ -400,8 +402,6 @@ int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
__activate_traps(vcpu);
__activate_vm(vcpu->kvm);
__vgic_restore_state(vcpu);
sysreg_restore_guest_state_vhe(guest_ctxt);
__debug_switch_to_guest(vcpu);
@@ -415,7 +415,6 @@ int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
fp_enabled = fpsimd_enabled_vhe();
sysreg_save_guest_state_vhe(guest_ctxt);
__vgic_save_state(vcpu);
__deactivate_traps(vcpu);
@@ -451,7 +450,7 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu)
__activate_traps(vcpu);
__activate_vm(kern_hyp_va(vcpu->kvm));
__vgic_restore_state(vcpu);
__hyp_vgic_restore_state(vcpu);
__timer_enable_traps(vcpu);
/*
@@ -484,7 +483,7 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu)
__sysreg_save_state_nvhe(guest_ctxt);
__sysreg32_save_state(vcpu);
__timer_disable_traps(vcpu);
__vgic_save_state(vcpu);
__hyp_vgic_save_state(vcpu);
__deactivate_traps(vcpu);
__deactivate_vm(vcpu);