On Wed, 1 Sep 2021 18:45:50 +1000, Alexey Kardashevskiy wrote:
> H_COPY_TOFROM_GUEST is an hcall for an upper level VM to access its nested
> VMs memory. The userspace can trigger WARN_ON_ONCE(!(gfp & __GFP_NOWARN))
> in __alloc_pages() by constructing a tiny VM which only does
> H_COPY_TOFROM_GUEST with a too big GPR9 (number of bytes to copy).
>
> This silences the warning by adding __GFP_NOWARN.
>
> [...]
Applied to powerpc/next.
[1/1] KVM: PPC: Book3S: Suppress failed alloc warning in H_COPY_TOFROM_GUEST
https://git.kernel.org/powerpc/c/792020907b11c6f9246c21977cab3bad985ae4b6
cheers
