github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-28 01:55:51 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

irqchip/gic-v4: Don't advertise VLPIs if no ITS is probed

Browse Source 
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 <maz@kernel.org>
Signed-off-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://patch.msgid.link/20260526125317.3672297-1-smostafa@google.com
This commit is contained in:
Mostafa Saleh 2026-05-26 12:53:17 +00:00 committed by Thomas Gleixner
parent 5fd6f21547
commit e61654fbc3
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/irqchip/irq-gic-v3-its.c
View File

@ -5833,6 +5833,7 @@ 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;
}