Re: [Xen-devel] [PATCH v4 12/19] xen: add PCI MMIO areas to memory map

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Fri, Nov 02, 2018 at 01:37:31PM +0100, Juergen Gross wrote:
> Add possible PCI space MMIO areas as "Reserved" to the memory map in
> order to avoid using those areas for special Xen pages later.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Reviewed-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx> but I would like to
here something from Roger here too.

Daniel

> ---
> V4: new patch (Roger Pau Monné)
> ---
>  grub-core/kern/i386/xen/pvh.c | 70 
> +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 70 insertions(+)
>
> diff --git a/grub-core/kern/i386/xen/pvh.c b/grub-core/kern/i386/xen/pvh.c
> index 58e6fefd5..442351d1d 100644
> --- a/grub-core/kern/i386/xen/pvh.c
> +++ b/grub-core/kern/i386/xen/pvh.c
> @@ -20,6 +20,7 @@
>  #include <grub/misc.h>
>  #include <grub/memory.h>
>  #include <grub/mm.h>
> +#include <grub/pci.h>
>  #include <grub/i386/cpuid.h>
>  #include <grub/i386/io.h>
>  #include <grub/xen.h>
> @@ -170,6 +171,73 @@ grub_xen_sort_mmap (void)
>      }
>  }
>
> +static grub_uint64_t
> +grub_xen_pci_read (grub_pci_address_t addr, grub_uint32_t is_64bit)
> +{
> +  grub_uint64_t val;
> +
> +  val = grub_pci_read (addr);
> +  if (is_64bit)
> +    {
> +      addr += sizeof (grub_uint32_t);
> +      val |= ((grub_uint64_t) grub_pci_read (addr)) << 32;
> +    }
> +
> +  return val;
> +}
> +
> +static void
> +grub_xen_pci_write (grub_pci_address_t addr, grub_uint64_t val,
> +                 grub_uint32_t is_64bit)
> +{
> +  grub_pci_write (addr, (grub_uint32_t) val);
> +  if (is_64bit)
> +    {
> +      addr += sizeof (grub_uint32_t);
> +      grub_pci_write (addr, val >> 32);
> +    }
> +}
> +
> +static int
> +grub_xen_pci_mmap (grub_pci_device_t dev,
> +                grub_pci_id_t pciid __attribute__ ((unused)),
> +                void *data __attribute__ ((unused)))
> +{
> +  int reg;
> +  grub_pci_address_t addr;
> +  grub_uint32_t val;
> +  grub_uint64_t mmio_addr, mmio_size;
> +
> +  if (nr_map_entries == ARRAY_SIZE (map))
> +    return 1;
> +
> +  for (reg = GRUB_PCI_REG_ADDRESSES; reg < GRUB_PCI_REG_CIS_POINTER;
> +       reg += sizeof (grub_uint32_t))
> +    {
> +      addr = grub_pci_make_address (dev, reg);
> +      val = grub_pci_read (addr);
> +      if (val == 0 ||
> +       (val & GRUB_PCI_ADDR_SPACE_MASK) != GRUB_PCI_ADDR_SPACE_MEMORY)
> +     continue;
> +
> +      val &= GRUB_PCI_ADDR_MEM_TYPE_MASK;
> +      mmio_addr = grub_xen_pci_read (addr, val);
> +      grub_xen_pci_write (addr, ~0ULL, val);
> +      mmio_size = ~(grub_xen_pci_read (addr, val) & ~0x0fULL) + 1;
> +      grub_xen_pci_write (addr, mmio_addr, val);
> +
> +      map[nr_map_entries].type = GRUB_MEMORY_RESERVED;
> +      map[nr_map_entries].addr = mmio_addr;
> +      map[nr_map_entries].len = mmio_size;
> +      nr_map_entries++;
> +
> +      if (val)
> +     reg += sizeof (grub_uint32_t);
> +    }
> +
> +  return 0;
> +}
> +
>  static void
>  grub_xen_get_mmap (void)
>  {
> @@ -182,6 +250,8 @@ grub_xen_get_mmap (void)
>      grub_xen_panic ("Could not get memory map from Xen.\n");
>    nr_map_entries = memmap.nr_entries;
>
> +  grub_pci_iterate (grub_xen_pci_mmap, NULL);
> +
>    grub_xen_sort_mmap ();
>  }
>
> --
> 2.16.4

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