John Baldwin be0319fd19 Add a tunable to disable migration of MSI-X interrupts. ... The new 'machdep.disable_msix_migration' tunable can be set to 1 to disable migration of MSI-X interrupts. Xen versions prior to 4.6.0 do not properly handle updates to MSI-X table entries after the initial write. In particular, the operation to unmask a table entry after updating it during migration is not propagated to the "real" table for passthrough devices causing the interrupt to remain masked. At least some systems in EC2 are affected by this bug when using SRIOV. The tunable can be set in loader.conf as a workaround. Submitted by: Jeremiah Lott <jlott@averesystems.com> (original patch) Approved by: re (marius) MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D6947		2016-06-24 22:49:32 +00:00
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acpica	Use M_NOWAIT when allocating memory for the ACPI wakeup handler.	2016-06-23 19:24:38 +00:00
bios	Add missing header needed by free(9).	2012-09-30 15:42:20 +00:00
cpufreq	Cleanup unnecessary semicolons from the kernel.	2016-04-10 23:07:00 +00:00
include	Implement _ALIGN() using internal integer types.	2016-05-31 13:31:19 +00:00
iommu	sys: use our roundup2/rounddown2() macros when param.h is available.	2016-04-21 19:57:40 +00:00
isa	Add an EARLY_AP_STARTUP option to start APs earlier during boot.	2016-05-14 18:22:52 +00:00
pci	Convert rman to use rman_res_t instead of u_long	2016-01-27 02:23:54 +00:00
x86	Add a tunable to disable migration of MSI-X interrupts.	2016-06-24 22:49:32 +00:00
xen	Remove misc NULL checks after M_WAITOK allocations.	2016-05-10 10:26:07 +00:00