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iommu/vt-d: Make posted MSI an opt-in command line option

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Add a command line opt-in option for posted MSI if CONFIG_X86_POSTED_MSI=y.

Also introduce a helper function for testing if posted MSI is supported on
the platform.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240423174114.526704-12-jacob.jun.pan@linux.intel.com
This commit is contained in:
Jacob Pan
2024-04-23 10:41:13 -07:00
committed by Thomas Gleixner
parent ce0a928711
commit be9be07b22
3 changed files with 13 additions and 1 deletions
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2
Documentation/admin-guide/kernel-parameters.txt
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@ -2251,6 +2251,8 @@
no_x2apic_optout
BIOS x2APIC opt-out request will be ignored
nopost disable Interrupt Posting
posted_msi
enable MSIs delivered as posted interrupts
iomem= Disable strict checking of access to MMIO memory
strict regions from userspace.