[pve-devel] [RFC v2 kernel] backport patch to fix TSC scaling for SVM
f.ebner at proxmox.com
Fri Oct 21 10:02:35 CEST 2022
Am 02.09.22 um 14:44 schrieb Fiona Ebner:
> The following issue reported on the community forum  is likely
> fixed by this.
> In my case, loading a VM snapshot that originally was taken on an
> Intel CPU on my AMD-based host often caused problems in other VMs. In
> particular, it often led to CPU stalls, and sometimes clock jumps far
> into the future. With this backport applied, everything seems to run
> smoothly even after loading the "bad" snapshot 10 times.
> The backport from upstream commit 11d39e8cc43e ("KVM: SVM: fix tsc
> scaling cache logic consisted of dropping the parts for nested TSC
> scaling, which is not yet present in our kernel, renaming the constant
> for the default ratio, and some context changes.
>  https://forum.proxmox.com/threads/112756/
> Signed-off-by: Fiona Ebner <f.ebner at proxmox.com>
> Changes from v1:
> * Alternative approach backporting the fix of the bad commit.
Ping. This still is an issue with 5.15.64-1-pve and users hit it
semi-regularly (likely ). This backport still fixes it for me.
Alternatively, we can go for the revert (but I didn't test the revert
with 5.15.64-1-pve yet).
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