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Message-ID: <beca07ad-833e-ca68-2fe7-a30a2cb9faef@huawei.com>
Date: Sun, 18 Feb 2024 16:46:53 +0800
From: Zenghui Yu <yuzenghui@...wei.com>
To: Oliver Upton <oliver.upton@...ux.dev>
CC: <kvmarm@...ts.linux.dev>, <kvm@...r.kernel.org>, Marc Zyngier
<maz@...nel.org>, James Morse <james.morse@....com>, Suzuki K Poulose
<suzuki.poulose@....com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 04/10] KVM: arm64: vgic-its: Walk the LPI xarray in
vgic_copy_lpi_list()
On 2024/2/17 2:41, Oliver Upton wrote:
> Start iterating the LPI xarray in anticipation of removing the LPI
> linked-list.
>
> Signed-off-by: Oliver Upton <oliver.upton@...ux.dev>
> ---
> arch/arm64/kvm/vgic/vgic-its.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c
> index fb2d3c356984..9ce2edfadd11 100644
> --- a/arch/arm64/kvm/vgic/vgic-its.c
> +++ b/arch/arm64/kvm/vgic/vgic-its.c
> @@ -335,6 +335,7 @@ static int update_lpi_config(struct kvm *kvm, struct vgic_irq *irq,
> int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr)
> {
> struct vgic_dist *dist = &kvm->arch.vgic;
> + XA_STATE(xas, &dist->lpi_xa, GIC_LPI_OFFSET);
> struct vgic_irq *irq;
> unsigned long flags;
> u32 *intids;
> @@ -353,7 +354,9 @@ int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr)
> return -ENOMEM;
>
> raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
> - list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
> + rcu_read_lock();
> +
> + xas_for_each(&xas, irq, INTERRUPT_ID_BITS_ITS) {
We should use '1 << INTERRUPT_ID_BITS_ITS - 1' to represent the maximum
LPI interrupt ID.
> if (i == irq_count)
> break;
> /* We don't need to "get" the IRQ, as we hold the list lock. */
> @@ -361,6 +364,8 @@ int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr)
> continue;
> intids[i++] = irq->intid;
> }
> +
> + rcu_read_unlock();
> raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
>
> *intid_ptr = intids;
Thanks,
Zenghui
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