git: 66d36f4f1025 - stable/14 - Turn off hw.pci.intx_reroute in EC2

The branch stable/14 has been updated by cperciva:

URL: https://cgit.FreeBSD.org/src/commit/?id=66d36f4f1025193a64cf296873ed4a4b34471d91

commit 66d36f4f1025193a64cf296873ed4a4b34471d91
Author:     Colin Percival <cperciva@FreeBSD.org>
AuthorDate: 2025-04-23 15:17:51 +0000
Commit:     Colin Percival <cperciva@FreeBSD.org>
CommitDate: 2025-04-26 19:21:22 +0000

    Turn off hw.pci.intx_reroute in EC2
    
    Having this enabled on Graviton systems prior to Graviton 4 results in
    a resource leak and a kernel panic after repeated hotplug/unplug.
    
    MFC after:      3 days
    Sponsored by:   Amazon
    
    (cherry picked from commit ce9a34b1614e37dc3f8763586448063408c7bf16)
---
 release/tools/ec2.conf | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/release/tools/ec2.conf b/release/tools/ec2.conf
index 2856068459c3..1116faed4e9c 100644
--- a/release/tools/ec2.conf
+++ b/release/tools/ec2.conf
@@ -72,6 +72,12 @@ ec2_common() {
 	# delay before rescanning upon device detach.
 	echo 'debug.acpi.quirks="56"' >> ${DESTDIR}/boot/loader.conf
 
+	# The default behaviour of re-routing INTx interrupts causes a
+	# resource leak on INTRng (aka on Graviton systems).  Repeated
+	# hotplug/unplug on PCI (not PCIe) Graviton systems ends up with
+	# a kernel panic unless we disable this.
+	echo 'hw.pci.intx_reroute=0' >> ${DESTDIR}/boot/loader.conf
+
 	# Load the kernel module for the Amazon "Elastic Network Adapter"
 	echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf