On Thu, Dec 01, 2011 at 06:36:17PM +0100, Jan Kiszka wrote:
> On 2011-12-01 18:22, Eric B Munson wrote:
> > On Thu, 01 Dec 2011, Jan Kiszka wrote:
> >
> >> On 2011-11-29 22:36, Eric B Munson wrote:
> >>> Often when a guest is stopped from the qemu console, it will report spurious
> >>> soft lockup warnings on resume. There are kernel patches being discussed that
> >>> will give the host the ability to tell the guest that it is being stopped and
> >>> should ignore the soft lockup warning that generates.
> >>>
> >>> Signed-off-by: Eric B Munson <emunson@xxxxxxxxx>
> >>> Cc: ryanh@xxxxxxxxxxxxxxxxxx
> >>> Cc: aliguori@xxxxxxxxxx
> >>> Cc: mtosatti@xxxxxxxxxx
> >>> Cc: avi@xxxxxxxxxx
> >>> Cc: kvm@xxxxxxxxxxxxxxx
> >>> Cc: linux-kernel@xxxxxxxxxxxxxxx
> >>> ---
> >>> target-i386/kvm.c | 6 ++++++
> >>> 1 files changed, 6 insertions(+), 0 deletions(-)
> >>>
> >>> diff --git a/target-i386/kvm.c b/target-i386/kvm.c
> >>> index 5bfc21f..defd364 100644
> >>> --- a/target-i386/kvm.c
> >>> +++ b/target-i386/kvm.c
> >>> @@ -336,12 +336,18 @@ static int kvm_inject_mce_oldstyle(CPUState *env)
> >>> return 0;
> >>> }
> >>>
> >>> +static void kvm_put_guest_paused(CPUState *penv)
> >>> +{
> >>> + kvm_vcpu_ioctl(penv, KVM_GUEST_PAUSED, 0);
> >>> +}
> >>
> >> I see no need in encapsulating this in a separate function.
> >>
> >>> +
> >>> static void cpu_update_state(void *opaque, int running, RunState state)
> >>> {
> >>> CPUState *env = opaque;
> >>>
> >>> if (running) {
> >>> env->tsc_valid = false;
> >>> + kvm_put_guest_paused(env);
> >>
> >> checkpatch.pl would have asked you to remove this tab.
> >>
> >> More general:
> >>
> >> Why is this x86-only? If the kernel interface is x86-only, what prevents
> >> making it generic right from the beginning?
> >
> > Sorry, missed this question on the first pass, this is x86 only because the
> > flag used lives in the pvclock structure. AFAICT, there aren't any other
> > architectures out there that implement paravirtualized clocks yet.
>
> That's an implementation "detail" of the kernel. The interface (IOCTL or
> kvm_run field) is generic, no?
>
> I would just fire this notification from generic code, evaluate the
> error (that was lacking so far), and only report it if it's something
> else than "not supported".
Yes, it should live in hw/kvmclock.c preferably.
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