6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mostafa Saleh [ Upstream commit e61654fbc3bc5d07ec9fafe29f33e19b2b5d0fd5 ] When accidentally setting “kvm-arm.vgic_v4_enable=1” on a system that has no MSI controller device tree node and GICv4, it results a panic as “gic_domain” is NULL and the kernel attempts to access it. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000028 Mem abort info: ESR = 0x0000000096000006 CPU: 1 UID: 0 PID: 295 Comm: lkvm-static Not tainted 7.1.0-rc4-ge3f15ad3970e #5 PREEMPT Hardware name: linux,dummy-virt (DT) pstate: 81402005 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : __irq_domain_instantiate+0x1d4/0x578 lr : __irq_domain_instantiate+0x1cc/0x578 Set vLPI support to false at init time if the host has no ITS, so it propagates properly to kvm_vgic_global_state.has_gicv4. Suggested-by: Marc Zyngier Signed-off-by: Mostafa Saleh Signed-off-by: Thomas Gleixner Acked-by: Marc Zyngier Link: https://patch.msgid.link/20260526125317.3672297-1-smostafa@google.com Signed-off-by: Sasha Levin --- drivers/irqchip/irq-gic-v3-its.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 53ca99b9d261f..592050e0246b9 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -5686,6 +5686,7 @@ int __init its_init(struct fwnode_handle *handle, struct rdists *rdists, its_acpi_probe(); if (list_empty(&its_nodes)) { + rdists->has_vlpis = false; pr_warn("ITS: No ITS available, not enabling LPIs\n"); return -ENXIO; } -- 2.53.0