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| author | Marc Zyngier <marc.zyngier@arm.com> | 2016-02-09 17:09:49 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-03-09 04:22:24 +0000 |
| commit | f8cfbce1bb85984d2601a18e8f21dacc1b79dce3 (patch) | |
| tree | 82a1d4ace25eb2bc717f35e7015a52cfc842079b /virt | |
| parent | 2a1044f8b7bfd99296774f5f90abf8f96013a997 (diff) | |
| download | linux-f8cfbce1bb85984d2601a18e8f21dacc1b79dce3.tar.gz | |
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>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/hyp/vgic-v2-sr.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/virt/kvm/arm/hyp/vgic-v2-sr.c b/virt/kvm/arm/hyp/vgic-v2-sr.c index c57622891a56..6d4dd7819a33 100644 --- a/virt/kvm/arm/hyp/vgic-v2-sr.c +++ b/virt/kvm/arm/hyp/vgic-v2-sr.c @@ -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); |