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KVM: arm/arm64: vgic-v2: Only wipe LRs on vcpu exit 

So far, we're always writing all possible LRs, setting the empty
ones with a zero value. This is obvious doing a lot 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 d6400d7746
commit cc1daf0b82
1 changed files with 5 additions and 5 deletions
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10
virt/kvm/arm/hyp/vgic-v2-sr.c
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@ -99,6 +99,7 @@ static void __hyp_text save_lrs(struct kvm_vcpu *vcpu, void __iomem *base)
}
cpu_if->vgic_lr[i] = readl_relaxed(base + GICH_LR0 + (i * 4));
writel_relaxed(0, base + GICH_LR0 + (i * 4));
}
}
@ -156,12 +157,11 @@ void __hyp_text __vgic_v2_restore_state(struct kvm_vcpu *vcpu)
writel_relaxed(cpu_if->vgic_hcr, base + GICH_HCR);
writel_relaxed(cpu_if->vgic_apr, base + GICH_APR);
for (i = 0; i < nr_lr; i++) {
u32 val = 0;
if (!(live_lrs & (1UL << i)))
continue;
if (live_lrs & (1UL << i))
val = cpu_if->vgic_lr[i];
writel_relaxed(val, base + GICH_LR0 + (i * 4));
writel_relaxed(cpu_if->vgic_lr[i],
base + GICH_LR0 + (i * 4));
}
}