Re: [Xen-devel] [PATCH 2/2] iommu: add rmrr Xen command line option for misc rmrrs

[Elena Ufimtseva <elena.ufimtseva@xxxxxxxxxx>]

On Tue, Mar 10, 2015 at 04:27:15PM +0000, Jan Beulich wrote:
> >>> On 10.03.15 at 17:16, <elena.ufimtseva@xxxxxxxxxx> wrote:
> > On Tue, Mar 10, 2015 at 02:47:24AM +0000, Tian, Kevin wrote:
> >> > From: elena.ufimtseva@xxxxxxxxxx [mailto:elena.ufimtseva@xxxxxxxxxx]
> >> > --- a/xen/drivers/passthrough/vtd/iommu.c
> >> > +++ b/xen/drivers/passthrough/vtd/iommu.c
> >> > @@ -1232,6 +1232,38 @@ static int intel_iommu_domain_init(struct domain
> >> > *d)
> >> >      return 0;
> >> >  }
> >> > 
> >> > +static void add_misc_rmrr(void)
> >> > +{
> >> > +    struct acpi_rmrr_unit *rmrrn;
> >> > +    struct misc_rmrr_unit *rmrru, *r;
> >> > +
> >> > +    list_for_each_entry_safe( rmrru, r, &misc_rmrr_units, list )
> >> > +    {
> >> > +        rmrrn = xzalloc(struct acpi_rmrr_unit);
> >> > +        if ( !rmrrn )
> >> > +            goto free;
> >> > +
> >> > +        rmrrn->scope.devices = xzalloc(typeof(*rmrrn->scope.devices));
> >> > +        if ( !rmrrn->scope.devices )
> >> > +        {
> >> > +            xfree(rmrrn);
> >> > +            goto free;
> >> > +        }
> >> > +        rmrrn->scope.devices_cnt = 1;
> >> > +        rmrrn->segment = rmrru->segment;
> >> > +        rmrrn->scope.devices[0] = rmrru->device;
> >> 
> >> need handle one-rmrr-multiple-deviecs. even if you don't want
> >> to support it, need capture user attempts at least.
> > 
> > Kevin, on the second thought, I think to support multiple devices 
> > per one rmrr one need to put on command line same address/range and
> > specify unique device each time. 
> 
> Why? Iirc it was you who already proposed a way to properly
> express this on the command line without having to repeat the
> memory addresses.

One more thought and exploring options as I dont have strong inclination
to either of the options.

> 
> Jan
> 

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