On 27.06.23 19:22, Demi Marie Obenour wrote:
When a grant entry is still in use by the remote domain, Linux must put it on a deferred list. Normally, this list is very short, because the PV network and block protocols expect the backend to unmap the grant first. However, Qubes OS's GUI protocol is subject to the constraints of the X Window System, and as such winds up with the frontend unmapping the window first. As a result, the list can grow very large, resulting in a massive memory leak and eventual VM freeze. To partially solve this problem, make the number of entries that the VM will attempt to free at each iteration tunable. The default is still 10, but it can be overridden at compile-time (via Kconfig), boot-time (via a kernel command-line option), or runtime (via sysfs).
You are still mentioning Kconfig. For the sysfs entry you should add something under Documentation/ABI. Sorry I didn't spot this omission previously. Juergen
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