Re: [Qemu-devel] [PATCH] i386: Fix signedness of hyperv_spinlock_attempts

[Eduardo Habkost <ehabkost@redhat.com>]

On Mon, Jun 17, 2019 at 01:48:59PM +0000, Roman Kagan wrote:
> On Sat, Jun 15, 2019 at 05:05:05PM -0300, Eduardo Habkost wrote:
> > The current default value for hv-spinlocks is 0xFFFFFFFF (meaning
> > "never retry").  However, the value is stored as a signed
> > integer, making the getter of the hv-spinlocks QOM property
> > return -1 instead of 0xFFFFFFFF.
> > 
> > Fix this by changing the type of X86CPU::hyperv_spinlock_attempts
> > to uint32_t.  This has no visible effect to guest operating
> > systems, affecting just the behavior of the QOM getter.
> > 
> > Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> > ---
> >  target/i386/cpu.h | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
> 
> That said, it's tempting to just nuke qdev_prop_spinlocks and make
> hv-spinlocks a regular DEFINE_PROP_UINT32...

Agreed.  The only difference is that we would validate the
property at realize time instead of object_property_set().

-- 
Eduardo