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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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3ed6cc9c2d
commit 70245f86c109e0eafb92ea9653184c0e44b4b35c upstream.
Invoking x86_init.irqs.create_pci_msi_domain() before
x86_init.pci.arch_init() breaks XEN PV.
The XEN_PV specific pci.arch_init() function overrides the default
create_pci_msi_domain() which is obviously too late.
As a consequence the XEN PV PCI/MSI allocation goes through the native
path which runs out of vectors and causes malfunction.
Invoke it after x86_init.pci.arch_init().
Fixes: 6b15ffa07d ("x86/irq: Initialize PCI/MSI domain at PCI init time")
Reported-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/87pn18djte.fsf@nanos.tec.linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <asm/pci_x86.h>
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#include <asm/x86_init.h>
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#include <asm/irqdomain.h>
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/* arch_initcall has too random ordering, so call the initializers
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in the right sequence from here. */
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static __init int pci_arch_init(void)
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{
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int type, pcbios = 1;
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type = pci_direct_probe();
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if (!(pci_probe & PCI_PROBE_NOEARLY))
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pci_mmcfg_early_init();
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if (x86_init.pci.arch_init)
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pcbios = x86_init.pci.arch_init();
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/*
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* Must happen after x86_init.pci.arch_init(). Xen sets up the
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* x86_init.irqs.create_pci_msi_domain there.
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*/
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x86_create_pci_msi_domain();
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if (!pcbios)
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return 0;
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pci_pcbios_init();
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/*
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* don't check for raw_pci_ops here because we want pcbios as last
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* fallback, yet it's needed to run first to set pcibios_last_bus
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* in case legacy PCI probing is used. otherwise detecting peer busses
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* fails.
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*/
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pci_direct_init(type);
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if (!raw_pci_ops && !raw_pci_ext_ops)
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printk(KERN_ERR
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"PCI: Fatal: No config space access function found\n");
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dmi_check_pciprobe();
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dmi_check_skip_isa_align();
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return 0;
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}
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arch_initcall(pci_arch_init);
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