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>
diff --git a/virt/kvm/arm/hyp/vgic-v2-sr.c b/virt/kvm/arm/hyp/vgic-v2-sr.c
index 6d4dd78..674bdf8 100644
--- a/virt/kvm/arm/hyp/vgic-v2-sr.c
+++ b/virt/kvm/arm/hyp/vgic-v2-sr.c
@@ -99,6 +99,7 @@
}
cpu_if->vgic_lr[i] = readl_relaxed(base + GICH_LR0 + (i * 4));
+ writel_relaxed(0, base + GICH_LR0 + (i * 4));
}
}
@@ -156,12 +157,11 @@
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));
}
}