[PATCH 03/15] KVM: arm64: vgic-v3: Iterate the xarray to find pending LPIs

Oliver Upton
2024-01-24T20:49:28Z

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.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
arch/arm64/kvm/vgic/vgic-v3.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/vgic/vgic-v3.c b/arch/arm64/kvm/vgic/vgic-v3.c
index 9465d3706ab9..4ea3340786b9 100644
--- 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;
--
2.43.0.429.g432eaa2c6b-goog