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x86/xen: Add xen_no_vector_callback option to test PCI INTX delivery

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[ Upstream commit b36b0fe96af13460278bf9b173beced1bd15f85d ]

It's useful to be able to test non-vector event channel delivery, to make
sure Linux will work properly on older Xen which doesn't have it.

It's also useful for those working on Xen and Xen-compatible hypervisors,
because there are guest kernels still in active use which use PCI INTX
even when vector delivery is available.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20210106153958.584169-4-dwmw2@infradead.org
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Woodhouse
2021-01-06 15:39:56 +00:00
committed by Greg Kroah-Hartman
parent fa5f2e04da
commit a8fddd4192
2 changed files with 14 additions and 1 deletions
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4
Documentation/admin-guide/kernel-parameters.txt
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@@ -5965,6 +5965,10 @@
This option is obsoleted by the "nopv" option, which
has equivalent effect for XEN platform.
xen_no_vector_callback
[KNL,X86,XEN] Disable the vector callback for Xen
event channel interrupts.
xen_scrub_pages= [XEN]
Boolean option to control scrubbing pages before giving them back
to Xen, for use by other domains. Can be also changed at runtime