The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     70245f86c109e0eafb92ea9653184c0e44b4b35c
Gitweb:        
https://git.kernel.org/tip/70245f86c109e0eafb92ea9653184c0e44b4b35c
Author:        Thomas Gleixner <t...@linutronix.de>
AuthorDate:    Wed, 10 Feb 2021 16:27:41 +01:00
Committer:     Thomas Gleixner <t...@linutronix.de>
CommitterDate: Wed, 10 Feb 2021 22:06:47 +01:00

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

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: 6b15ffa07dc3 ("x86/irq: Initialize PCI/MSI domain at PCI init time")
Reported-by: Juergen Gross <jgr...@suse.com>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Tested-by: Juergen Gross <jgr...@suse.com>
Cc: sta...@vger.kernel.org
Link: https://lore.kernel.org/r/87pn18djte....@nanos.tec.linutronix.de
---
 arch/x86/pci/init.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/x86/pci/init.c b/arch/x86/pci/init.c
index 00bfa1e..0bb3b8b 100644
--- a/arch/x86/pci/init.c
+++ b/arch/x86/pci/init.c
@@ -9,16 +9,23 @@
    in the right sequence from here. */
 static __init int pci_arch_init(void)
 {
-       int type;
-
-       x86_create_pci_msi_domain();
+       int type, pcbios = 1;
 
        type = pci_direct_probe();
 
        if (!(pci_probe & PCI_PROBE_NOEARLY))
                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;
 
        pci_pcbios_init();

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