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Commit4f86a06e2d("irqdomain: Make normal and nomap irqdomains exclusive") introduced an IRQ_DOMAIN_FLAG_NO_MAP flag to isolate the 'nomap' domains still in use under the powerpc arch. With this new flag, the revmap_tree of the IRQ domain is not used anymore. This change broke the support of shared LSIs [1] in the XIVE driver because it was relying on a lookup in the revmap_tree to query previously mapped interrupts. Linux now creates two distinct IRQ mappings on the same HW IRQ which can lead to unexpected behavior in the drivers. The XIVE IRQ domain is not a direct mapping domain and its HW IRQ interrupt number space is rather large : 1M/socket on POWER9 and POWER10, change the XIVE driver to use a 'tree' domain type instead. [1] For instance, a linux KVM guest with virtio-rng and virtio-balloon devices. Fixes:4f86a06e2d("irqdomain: Make normal and nomap irqdomains exclusive") Cc: stable@vger.kernel.org # v5.14+ Signed-off-by: Cédric Le Goater <clg@kaod.org> Tested-by: Greg Kurz <groug@kaod.org> Acked-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211116134022.420412-1-clg@kaod.org
15 lines
227 B
Plaintext
15 lines
227 B
Plaintext
# SPDX-License-Identifier: GPL-2.0
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config PPC_XIVE
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bool
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select PPC_SMP_MUXED_IPI
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select HARDIRQS_SW_RESEND
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config PPC_XIVE_NATIVE
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bool
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select PPC_XIVE
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depends on PPC_POWERNV
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config PPC_XIVE_SPAPR
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bool
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select PPC_XIVE
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