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arm64: KVM: vgic-v3: Only wipe LRs on vcpu exit

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So far, we're always writing all possible LRs, setting the empty
ones with a zero value. This is obvious doing a low of work for
nothing, and we're better off clearing those we've actually
dirtied on the exit path (it is very rare to inject more than one
interrupt at a time anyway).

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 17:36:09 +00:00
parent 0d98d00b8d
commit b40c4892d1
1 changed files with 4 additions and 5 deletions
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9
arch/arm64/kvm/hyp/vgic-v3-sr.c
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@ -196,6 +196,7 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
}
cpu_if->vgic_lr[i] = __gic_v3_get_lr(i);
__gic_v3_set_lr(0, i);
}
switch (nr_pri_bits) {
@ -293,12 +294,10 @@ void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu)
}
for (i = 0; i <= max_lr_idx; i++) {
val = 0;
if (!(live_lrs & (1 << i)))
continue;
if (live_lrs & (1 << i))
val = cpu_if->vgic_lr[i];
__gic_v3_set_lr(val, i);
__gic_v3_set_lr(cpu_if->vgic_lr[i], i);
}
}