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 <tglx@xxxxxxxxxxxxx>
AuthorDate: Wed, 10 Feb 2021 16:27:41 +01:00
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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 <jgross@xxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Juergen Gross <jgross@xxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/87pn18djte.fsf@xxxxxxxxxxxxxxxxxxxxxxx
---
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();
|