On Sat, 16 Oct 2021 00:39:28 +1100, Michael Ellerman wrote:
> In commit 10d91611f426 ("powerpc/64s: Reimplement book3s idle code in
> C") kvm_start_guest() became idle_kvm_start_guest(). The old code
> allocated a stack frame on the emergency stack, but didn't use the
> frame to store anything, and also didn't store anything in its caller's
> frame.
>
> idle_kvm_start_guest() on the other hand is written more like a normal C
> function, it creates a frame on entry, and also stores CR/LR into its
> callers frame (per the ABI). The problem is that there is no caller
> frame on the emergency stack.
>
> [...]
Applied to powerpc/fixes.
[1/2] KVM: PPC: Book3S HV: Fix stack handling in idle_kvm_start_guest()
https://git.kernel.org/powerpc/c/9b4416c5095c20e110c82ae602c254099b83b72f
[2/2] KVM: PPC: Book3S HV: Make idle_kvm_start_guest() return 0 if it went to guest
https://git.kernel.org/powerpc/c/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337
cheers
