Hi,
Please backport [1] to 4.4, 4.9, 4.14, 4.19.
It fixes a commit that has been backported to all the current stable releases but for some reason the fixup was only backported to 5.4 & 5.8.
Debian 9 no longer boots as a Xen HVM guest because it is missing the fixup patch.
Thanks, Ross
[1]:
commit 0891fb39ba67bd7ae023ea0d367297ffff010781 Author: Juergen Gross jgross@suse.com Date: Wed Sep 30 11:16:14 2020 +0200
xen/events: don't use chip_data for legacy IRQs
Since commit c330fb1ddc0a ("XEN uses irqdesc::irq_data_common::handler_data to store a per interrupt XEN data pointer which contains XEN specific information.") Xen is using the chip_data pointer for storing IRQ specific data. When running as a HVM domain this can result in problems for legacy IRQs, as those might use chip_data for their own purposes.
Use a local array for this purpose in case of legacy IRQs, avoiding the double use.
Cc: stable@vger.kernel.org Fixes: c330fb1ddc0a ("XEN uses irqdesc::irq_data_common::handler_data to store a per interrupt XEN data pointer which contains XEN specific information.") Signed-off-by: Juergen Gross jgross@suse.com Tested-by: Stefan Bader stefan.bader@canonical.com Reviewed-by: Boris Ostrovsky boris.ostrovsky@oracle.com Link: https://lore.kernel.org/r/20200930091614.13660-1-jgross@suse.com Signed-off-by: Juergen Gross jgross@suse.com