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arm64: KVM: vgic-v3: Do not save an LR known to be empty 

On exit, any empty LR will be signaled in ICH_ELRSR_EL2. Which
means that we do not have to save it, and we can just clear
its state in the in-memory copy.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-02-09 17:09:49 +00:00
parent b4344545cf
commit 84e8b9c88d
1 changed files with 9 additions and 2 deletions
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11
arch/arm64/kvm/hyp/vgic-v3-sr.c
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@ -187,8 +187,15 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
save_maint_int_state(vcpu, max_lr_idx + 1);
for (i = 0; i <= max_lr_idx; i++) {
if (vcpu->arch.vgic_cpu.live_lrs & (1UL << i))
cpu_if->vgic_lr[i] = __gic_v3_get_lr(i);
if (!(vcpu->arch.vgic_cpu.live_lrs & (1UL << i)))
continue;
if (cpu_if->vgic_elrsr & (1 << i)) {
cpu_if->vgic_lr[i] &= ~ICH_LR_STATE;
continue;
}
cpu_if->vgic_lr[i] = __gic_v3_get_lr(i);
}
switch (nr_pri_bits) {