Re: [PATCH v2] KVM: s390: Also reset registers in sync regs for initial cpu reset

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On Tue, 10 Mar 2020 14:21:23 +0100
David Hildenbrand <david@xxxxxxxxxx> wrote:

> On 10.03.20 14:12, Christian Borntraeger wrote:
> > When we do the initial CPU reset we must not only clear the registers
> > in the internal data structures but also in kvm_run sync_regs. For
> > modern userspace sync_regs is the only place that it looks at.
> > 
> > Cc: stable@xxxxxxxxxxxxxxx  
> 
> # v?
> 
> > Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> > ---
> >  arch/s390/kvm/kvm-s390.c | 18 +++++++++++++++++-
> >  1 file changed, 17 insertions(+), 1 deletion(-)

> However, I do wonder if that ioctl *originally* was designed for that -
> IOW if this is rally a stable patch or just some change that makes
> sense. IIRC, userspace/QEMU always did the right thing, no? There was no
> documentation about the guarantees AFAIK.

The documentation only refers to the PoP for what is actually reset...
should it also mention the sync regs?




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