KVM: arm64: vgic-v3: Iterate the xarray to find pending LPIs

Start walking the LPI xarray to find pending LPIs in preparation for
the removal of the LPI linked-list. Note that the 'basic' iterator
is chosen here as each iteration needs to drop the xarray read lock
(RCU) as reads/writes to guest memory can potentially block.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240221054253.3848076-4-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

diff --git a/arch/arm64/kvm/vgic/vgic-v3.c b/arch/arm64/kvm/vgic/vgic-v3.c
index 9465d3706ab9bcf8fb7fd72a8904d6b87ede574a..4ea3340786b950527fe87821ec26252a99e384bb 100644 (file)
--- a/arch/arm64/kvm/vgic/vgic-v3.c
+++ b/arch/arm64/kvm/vgic/vgic-v3.c
@@ -380,6 +380,7 @@ int vgic_v3_save_pending_tables(struct kvm *kvm)
        struct vgic_irq *irq;
        gpa_t last_ptr = ~(gpa_t)0;
        bool vlpi_avail = false;
+       unsigned long index;
        int ret = 0;
        u8 val;
 
@@ -396,7 +397,7 @@ int vgic_v3_save_pending_tables(struct kvm *kvm)
                vlpi_avail = true;
        }
 
-       list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
+       xa_for_each(&dist->lpi_xa, index, irq) {
                int byte_offset, bit_nr;
                struct kvm_vcpu *vcpu;
                gpa_t pendbase, ptr;