[PATCH 0/3] irqchip/gic-v4, KVM: arm64: Fix the vgic init error paths

[Fuad Tabba <fuad.tabba@linux.dev>]

Hi folks,

Three fixes on the paths that run when vgic init fails partway. Each one
needs an allocation failure to reach.

Sashiko reported the vgic_init() case [1] while reviewing the SPI-array
leak fix. The two irq-gic-v4.c fixes came out of chasing it [2].

Patch 1 clears the irq domain and fwnode pointers at the four GICv4
sites that free them and leave them set. Patch 2 makes
its_alloc_vcpu_irqs() release what it allocated when the SGI loop fails.
Patch 3 releases the SPI array and the vPEs on vgic_init()'s later
failure paths, so KVM_DEV_ARM_VGIC_CTRL_INIT is all or nothing and a
retry starts from scratch.

These patches run across two subsystems, but ordering matters, which is
why this is one series. Patch 3 runs vgic_v4_teardown() on a path it
never ran on before, which adds a route into what patch 1 fixes, and
patch 2 reuses its_free_sgi_irqs() from an error path, which only works
once patch 1 has cleared the pointers.

Based on kvmarm/next (aa8e5dc6a7a2a).

Cheers,
/fuad

[1] https://lore.kernel.org/all/20260807105558.73D701F000E9@smtp.kernel.org/
[2] https://lore.kernel.org/all/CA+EHjTyDix+y6NTLTsXP5j9Sn2VLOZcsw94LntQxg_etRBJZuA@mail.gmail.com/

Fuad Tabba (3):
  irqchip/gic-v4: Clear the domain and fwnode pointers after freeing
    them
  irqchip/gic-v4: Unwind what its_alloc_vcpu_irqs() allocated on failure
  KVM: arm64: vgic: Tear down what vgic_init() created when it fails

 arch/arm64/kvm/vgic/vgic-init.c | 11 +++++++++--
 drivers/irqchip/irq-gic-v4.c    | 34 +++++++++++++++++++++++++++------
 2 files changed, 37 insertions(+), 8 deletions(-)


base-commit: aa8e5dc6a7a2a1141ab40706a51010adcd0e57d2
-- 
2.39.5