Re: [PATCH v4.14 4/4] KVM: PPC: Book3S HV: Fix guest time accounting with VIRT_CPU_ACCOUNTING_GEN

[Greg KH <greg@kroah.com>]

On Fri, May 11, 2018 at 04:21:41PM +1000, Paul Mackerras wrote:
> commit 61bd0f66ff92d5ce765ff9850fd3cbfec773c560 upstream.
> 
> Since commit 8b24e69fc47e ("KVM: PPC: Book3S HV: Close race with testing
> for signals on guest entry"), if CONFIG_VIRT_CPU_ACCOUNTING_GEN is set, the
> guest time is not accounted to guest time and user time, but instead to
> system time.
> 
> This is because guest_enter()/guest_exit() are called while interrupts
> are disabled and the tick counter cannot be updated between them.
> 
> To fix that, move guest_exit() after local_irq_enable(), and as
> guest_enter() is called with IRQ disabled, call guest_enter_irqoff()
> instead.
> 
> Fixes: 8b24e69fc47e ("KVM: PPC: Book3S HV: Close race with testing for signals on guest entry")
> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
> ---
>  arch/powerpc/kvm/book3s_hv.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)

Applied, thanks.

greg k-h