Re: [Xen-devel] [PATCH] xen/mcfg: Call PHYSDEVOP_pci_mmcfg_reserved for MCFG areas.

[Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>]

On Wed, Nov 06, 2013 at 04:27:47PM -0500, Konrad Rzeszutek Wilk wrote:
> Resending it to LKML.
> On Wed, Nov 06, 2013 at 03:32:23PM -0500, Konrad Rzeszutek Wilk wrote:
> > The PCI MMCONFIG area is usually reserved via the E820 so the Xen hypervisor
> > is aware of these regions. But they can also be enumerated in the ACPI
> > DSDT which means the hypervisor won't know of them until the initial
> > domain informs it of via PHYSDEVOP_pci_mmcfg_reserved.
> > 
> > This is what this patch does for all of the MCFG regions that the
> > initial domain is aware of (E820 enumerated and ACPI).
> > 
> > Reported-by:  Santosh Jodh <Santosh.Jodh@xxxxxxxxxx>
> > CC: Jan Beulich <JBeulich@xxxxxxxx>
> > CC: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> > CC: David Vrabel <david.vrabel@xxxxxxxxxx>
> > CC: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > [v1: Redid it a bit]
> > [v2: Dropped the P2M 1-1 setting]
> > [v3: Check for Xen in-case we are running under baremetal]
> > ---
> >  drivers/xen/pci.c               | 45 
> > +++++++++++++++++++++++++++++++++++++++++
> >  include/xen/interface/physdev.h | 11 ++++++++++
> >  2 files changed, 56 insertions(+)
> > 
> > diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
> > index 18fff88..0331fe9 100644
> > --- a/drivers/xen/pci.c
> > +++ b/drivers/xen/pci.c
> > @@ -26,6 +26,7 @@
> >  #include <asm/xen/hypervisor.h>
> >  #include <asm/xen/hypercall.h>
> >  #include "../pci/pci.h"
> > +#include <asm/pci_x86.h>
> >  
> >  static bool __read_mostly pci_seg_supported = true;
> >  
> > @@ -192,3 +193,47 @@ static int __init register_xen_pci_notifier(void)
> >  }
> >  
> >  arch_initcall(register_xen_pci_notifier);
> > +

The build-bot tells me that I should also wrap these with

#ifdef CONFIG_PCI_MMCONFIG
> > +static int __init xen_mcfg_late(void)
> > +{
> > +   struct pci_mmcfg_region *cfg;
> > +   int rc;
> > +
> > +   if (!xen_initial_domain())
> > +           return 0;
> > +
> > +   if ((pci_probe & PCI_PROBE_MMCONF) == 0)
> > +           return 0;
> > +
> > +   if (list_empty(&pci_mmcfg_list))
> > +           return 0;
> > +
> > +   /* Check whether they are in the right area. */
> > +   list_for_each_entry(cfg, &pci_mmcfg_list, list) {
> > +           struct physdev_pci_mmcfg_reserved r;
> > +
> > +           r.address = cfg->address;
> > +           r.segment = cfg->segment;
> > +           r.start_bus = cfg->start_bus;
> > +           r.end_bus = cfg->end_bus;
> > +           r.flags = XEN_PCI_MMCFG_RESERVED;
> > +
> > +           rc = HYPERVISOR_physdev_op(PHYSDEVOP_pci_mmcfg_reserved, &r);
> > +           switch (rc) {
> > +           case 0:
> > +           case -ENOSYS:
> > +                   continue;
> > +
> > +           default:
> > +                   pr_warn("Failed to report MMCONFIG reservation"
> > +                           " state for %s to hypervisor"
> > +                           " (%d)\n",
> > +                           cfg->name, rc);
> > +           }
> > +   }
> > +   return 0;
> > +}
> > +/*
> > + * Needs to be done after acpi_init which are subsys_initcall.
> > + */
> > +subsys_initcall_sync(xen_mcfg_late);

#endif
> > diff --git a/include/xen/interface/physdev.h 
> > b/include/xen/interface/physdev.h
> > index 7000bb1..42721d1 100644
> > --- a/include/xen/interface/physdev.h
> > +++ b/include/xen/interface/physdev.h
> > @@ -231,6 +231,17 @@ struct physdev_get_free_pirq {
> >  #define XEN_PCI_DEV_VIRTFN             0x2
> >  #define XEN_PCI_DEV_PXM                0x4
> >  
> > +#define XEN_PCI_MMCFG_RESERVED         0x1
> > +
> > +#define PHYSDEVOP_pci_mmcfg_reserved    24
> > +struct physdev_pci_mmcfg_reserved {
> > +    uint64_t address;
> > +    uint16_t segment;
> > +    uint8_t start_bus;
> > +    uint8_t end_bus;
> > +    uint32_t flags;
> > +};
> > +
> >  #define PHYSDEVOP_pci_device_add        25
> >  struct physdev_pci_device_add {
> >      /* IN */
> > -- 
> > 1.8.3.1
> > 
> 
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