Public bug reported:
[impact]
the impact is the same as bug 1886704, the qemu vhost-user driver fails
to init. see that bug for more details on the impact.
[test case]
start a qemu guest with at least one vhost-user interface, and more than
8 discontiguous memory regions. The vhost-user device will fail to init
due to exceeding its max memory region limit.
[regression potential]
as this causes vhost-user to ignore some mem regions, any regression
would likely involve problems with the vhost-user interface; possibly
failure to init the interface, or failure to configure the interface, or
problems while using the interface.
[scope]
TBD
[other info]
this is closely related to bug 1886704, but that bug is specifically
about the 8 mem region limit of the vhost-user api. This bug doesn't
attempt to fix that limitation (as it requires using a new extension of
the vhost-user api to increase the max mem regions), this only backports
existing upstream patches that fix the vhost region calculations and
allow the vhost-user driver to indicate which mem regions it doesn't
need to use, so those are ignored, in order to keep the total under the
vhost-user limit.
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: Fix Released
** Affects: qemu (Ubuntu Bionic)
Importance: Medium
Assignee: Dan Streetman (ddstreet)
Status: In Progress
** Also affects: qemu (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: qemu (Ubuntu Bionic)
Assignee: (unassigned) => Dan Streetman (ddstreet)
** Changed in: qemu (Ubuntu Bionic)
Importance: Undecided => Medium
** Changed in: qemu (Ubuntu Bionic)
Status: New => In Progress
** Changed in: qemu (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1887525
Title:
qemu vhost-user should ignore irrelevant mem regions because it has
limit of 8 regions
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