On Thursday 18 November 2010 14:21:40 Michael S. Tsirkin wrote:
> On Thu, Nov 18, 2010 at 09:58:55AM +0800, Sheng Yang wrote:
> > > > +static int msix_mmio_write(struct kvm_io_device *this, gpa_t addr,
> > > > int len, + const void *val)
> > > > +{
> > > > + struct kvm_assigned_dev_kernel *adev =
> > > > + container_of(this, struct
> > > > kvm_assigned_dev_kernel,
> > > > + msix_mmio_dev);
> > > > + int idx, r = 0;
> > > > + unsigned long new_val = *(unsigned long *)val;
> > >
> > > What if it's a 64-bit write on a 32-bit host?
> >
> > In fact we haven't support QWORD(64bit) accessing now. The reason is we
> > haven't seen any OS is using it in this way now, so I think we can leave
> > it later.
> >
> > Also seems QEmu doesn't got the way to handle 64bit MMIO.
>
> I think it does. I think it simply splits these to 32-bit transactions
> and handles as such. That seems to be spec-compilant. I wouldn't want us
> to regress.
Yes, you're right...
I think I have to add it. :shrug:
--
regards
Yang, Sheng
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