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| author | David Gibson | 2016-10-13 01:26:09 +0200 |
|---|---|---|
| committer | David Gibson | 2016-10-16 03:03:09 +0200 |
| commit | 6737d9ad79f6db657c7fc5658355aa5045dbfa2c (patch) | |
| tree | d51b54cf2a2489fac7c1f9c07084847618113873 /include/hw/pci-host/spapr.h | |
| parent | libqos: Limit spapr-pci to 32-bit MMIO for now (diff) | |
| download | qemu-6737d9ad79f6db657c7fc5658355aa5045dbfa2c.tar.gz qemu-6737d9ad79f6db657c7fc5658355aa5045dbfa2c.tar.xz qemu-6737d9ad79f6db657c7fc5658355aa5045dbfa2c.zip | |
spapr_pci: Delegate placement of PCI host bridges to machine type
The 'spapr-pci-host-bridge' represents the virtual PCI host bridge (PHB)
for a PAPR guest. Unlike on x86, it's routine on Power (both bare metal
and PAPR guests) to have numerous independent PHBs, each controlling a
separate PCI domain.
There are two ways of configuring the spapr-pci-host-bridge device: first
it can be done fully manually, specifying the locations and sizes of all
the IO windows. This gives the most control, but is very awkward with 6
mandatory parameters. Alternatively just an "index" can be specified
which essentially selects from an array of predefined PHB locations.
The PHB at index 0 is automatically created as the default PHB.
The current set of default locations causes some problems for guests with
large RAM (> 1 TiB) or PCI devices with very large BARs (e.g. big nVidia
GPGPU cards via VFIO). Obviously, for migration we can only change the
locations on a new machine type, however.
This is awkward, because the placement is currently decided within the
spapr-pci-host-bridge code, so it breaks abstraction to look inside the
machine type version.
So, this patch delegates the "default mode" PHB placement from the
spapr-pci-host-bridge device back to the machine type via a public method
in sPAPRMachineClass. It's still a bit ugly, but it's about the best we
can do.
For now, this just changes where the calculation is done. It doesn't
change the actual location of the host bridges, or any other behaviour.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Diffstat (limited to 'include/hw/pci-host/spapr.h')
| -rw-r--r-- | include/hw/pci-host/spapr.h | 11 |
1 files changed, 1 insertions, 10 deletions
diff --git a/include/hw/pci-host/spapr.h b/include/hw/pci-host/spapr.h index 30dbd461d4..8c9ebfda41 100644 --- a/include/hw/pci-host/spapr.h +++ b/include/hw/pci-host/spapr.h @@ -79,18 +79,9 @@ struct sPAPRPHBState { uint32_t numa_node; }; -#define SPAPR_PCI_MAX_INDEX 255 - -#define SPAPR_PCI_BASE_BUID 0x800000020000000ULL - #define SPAPR_PCI_MEM_WIN_BUS_OFFSET 0x80000000ULL -#define SPAPR_PCI_WINDOW_BASE 0x10000000000ULL -#define SPAPR_PCI_WINDOW_SPACING 0x1000000000ULL -#define SPAPR_PCI_MMIO_WIN_OFF 0xA0000000 -#define SPAPR_PCI_MMIO_WIN_SIZE (SPAPR_PCI_WINDOW_SPACING - \ - SPAPR_PCI_MEM_WIN_BUS_OFFSET) -#define SPAPR_PCI_IO_WIN_OFF 0x80000000 +#define SPAPR_PCI_MMIO_WIN_SIZE 0xf80000000 #define SPAPR_PCI_IO_WIN_SIZE 0x10000 #define SPAPR_PCI_MSI_WINDOW 0x40000000000ULL |