On 26/03/20 21:08, Thomas Voegtle wrote: > On Thu, 26 Mar 2020, Paolo Bonzini wrote: > >> On 26/03/20 18:43, Thomas Voegtle wrote: >>> >>> Hello, >>> >>> the following one line commit >>> >>> commit 7df003c85218b5f5b10a7f6418208f31e813f38f >>> Author: Zhuang Yanying <ann.zhuangyanying@xxxxxxxxxx> >>> Date: Sat Oct 12 11:37:31 2019 +0800 >>> >>> KVM: fix overflow of zero page refcount with ksm running >>> >>> >>> applies cleanly to v5.5.y, v5.4.y, 4.19.y, v4.14.y and v4.9.y. >>> >>> I actually ran into that bug on 4.9.y >>> >>> Thanks in advance, >>> >>> Thomas >>> >>> >>> >> >> Yes, indeed. It's not a trivial backport though, so I prefer to do it >> manually. I can help with that, or with reviews if Yanying already has >> patches ready. > > Are you sure we are talking about the same commit? Or do I really see > something wrong here? > It's an one liner. Applies cleanly. Compiles. > Don't know if it fixes the bug, though. It's a one liner, but usage of the function it touches has changed subtly over the years. So before committing it to stable I need to check that all uses of kvm_is_reserved_pfn match 5.6 (and also kvm_is_zone_device_pfn is probably not there in older kernels, though I might be missing more stable backports there). Paolo
