Re: [Qemu-devel] [RFC v2 2/3] intel_iommu: add 256 bits qi_desc support

[Yi Sun]

On 19-03-01 14:59:00, Peter Xu wrote:
> On Thu, Feb 28, 2019 at 09:47:56PM +0800, Yi Sun wrote:
> > From: "Liu, Yi L" <address@hidden>
> > 
> > Per Intel(R) VT-d 3.0, the qi_desc is 256 bits in Scalable
> > Mode. This patch adds emulation of 256bits qi_desc.
> > 
> > Signed-off-by: Liu, Yi L <address@hidden>
> > [Yi Sun is co-developer to rebase and refine the patch.]
> > Signed-off-by: Yi Sun <address@hidden>
> 
> [...]
> 
> > @@ -2501,7 +2507,12 @@ static void vtd_handle_iqt_write(IntelIOMMUState *s)
> >  {
> >      uint64_t val = vtd_get_quad_raw(s, DMAR_IQT_REG);
> >  
> > -    s->iq_tail = VTD_IQT_QT(val);
> > +    if (s->iq_dw && val & VTD_IQT_QT_256_RSV_BIT) {
> 
> Nit: Let's do (val & VTD_IQT_QT_256_RSV_BIT) to be clear.  With that:
> 
Sure. Thanks!

> Reviewed-by: Peter Xu <address@hidden>
> 
> Regards,
> 
> -- 
> Peter Xu