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x86/pci: Create PCI/MSI irqdomain after x86_init.pci.arch_init()

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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
This commit is contained in:
Thomas Gleixner 2021-02-10 16:27:41 +01:00
parent 256b92af78
commit 70245f86c1
1 changed files with 11 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

15
arch/x86/pci/init.c
View file

@ -9,16 +9,23 @@
in the right sequence from here. */ in the right sequence from here. */
static __init int pci_arch_init(void) static __init int pci_arch_init(void)
{ {
int type; int type, pcbios = 1;
x86_create_pci_msi_domain();
type = pci_direct_probe(); type = pci_direct_probe();
if (!(pci_probe & PCI_PROBE_NOEARLY)) if (!(pci_probe & PCI_PROBE_NOEARLY))
pci_mmcfg_early_init(); pci_mmcfg_early_init();
if (x86_init.pci.arch_init && !x86_init.pci.arch_init()) if (x86_init.pci.arch_init)
pcbios = x86_init.pci.arch_init();
/*
* Must happen after x86_init.pci.arch_init(). Xen sets up the
* x86_init.irqs.create_pci_msi_domain there.
*/
x86_create_pci_msi_domain();
if (!pcbios)
return 0; return 0;
pci_pcbios_init(); pci_pcbios_init();