linux

iv/linux

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Cédric Le Goater 1904050cac powerpc/xive: Discard disabled interrupts in get_irqchip_state()

commit 6f779e1d359b8d5801f677c1d49dcfa10bf95674 upstream.

When an interrupt is passed through, the KVM XIVE device calls the
set_vcpu_affinity() handler which raises the P bit to mask the
interrupt and to catch any in-flight interrupts while routing the
interrupt to the guest.

On the guest side, drivers (like some Intels) can request at probe
time some MSIs and call synchronize_irq() to check that there are no
in flight interrupts. This will call the XIVE get_irqchip_state()
handler which will always return true as the interrupt P bit has been
set on the host side and lock the CPU in an infinite loop.

Fix that by discarding disabled interrupts in get_irqchip_state().

Fixes: da15c03b047d ("powerpc/xive: Implement get_irqchip_state method for XIVE to fix shutdown race")
Cc: stable@vger.kernel.org #v5.4+
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Tested-by: seeteena <s1seetee@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211011070203.99726-1-clg@kaod.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2021-10-20 11:40:15 +02:00

alpha

alpha: Declare virt_to_phys and virt_to_bus parameter as pointer to volatile

2021-09-30 10:09:26 +02:00

arc

ARC: export clear_user_page() for modules

2021-09-22 12:26:45 +02:00

arm

bus: ti-sysc: Use CLKDM_NOAUTO for dra7 dcan1 for errata i893

2021-10-13 10:08:19 +02:00

arm64

arm64: dts: ls1028a: add missing CAN nodes