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KVM: arm/arm64: vgic-v2: Do not save an LR known to be empty 

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

Take this opportunity to move the LR saving code into its
own function.

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 2a1044f8b7
commit f8cfbce1bb
1 changed files with 20 additions and 6 deletions
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26
virt/kvm/arm/hyp/vgic-v2-sr.c
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@ -83,6 +83,25 @@ static void __hyp_text save_elrsr(struct kvm_vcpu *vcpu, void __iomem *base)
#endif
}
static void __hyp_text save_lrs(struct kvm_vcpu *vcpu, void __iomem *base)
{
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
int nr_lr = vcpu->arch.vgic_cpu.nr_lr;
int i;
for (i = 0; i < nr_lr; i++) {
if (!(vcpu->arch.vgic_cpu.live_lrs & (1UL << i)))
continue;
if (cpu_if->vgic_elrsr & (1UL << i)) {
cpu_if->vgic_lr[i] &= ~GICH_LR_STATE;
continue;
}
cpu_if->vgic_lr[i] = readl_relaxed(base + GICH_LR0 + (i * 4));
}
}
/* vcpu is already in the HYP VA space */
void __hyp_text __vgic_v2_save_state(struct kvm_vcpu *vcpu)
{
@ -90,12 +109,10 @@ void __hyp_text __vgic_v2_save_state(struct kvm_vcpu *vcpu)
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
struct vgic_dist *vgic = &kvm->arch.vgic;
void __iomem *base = kern_hyp_va(vgic->vctrl_base);
int i, nr_lr;
if (!base)
return;
nr_lr = vcpu->arch.vgic_cpu.nr_lr;
cpu_if->vgic_vmcr = readl_relaxed(base + GICH_VMCR);
if (vcpu->arch.vgic_cpu.live_lrs) {
@ -103,10 +120,7 @@ void __hyp_text __vgic_v2_save_state(struct kvm_vcpu *vcpu)
save_maint_int_state(vcpu, base);
save_elrsr(vcpu, base);
for (i = 0; i < nr_lr; i++)
if (vcpu->arch.vgic_cpu.live_lrs & (1UL << i))
cpu_if->vgic_lr[i] = readl_relaxed(base + GICH_LR0 + (i * 4));
save_lrs(vcpu, base);
writel_relaxed(0, base + GICH_HCR);