diff options
| author | Daniel P. Berrangé <berrange@redhat.com> | 2018-08-30 11:57:57 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-11-06 21:35:05 +0100 |
| commit | d4715481ded13231d9ff8ae17da648de78b925d0 (patch) | |
| tree | 446cf9c528a7d0891cd87255eedfff87a25f357c /include | |
| parent | e204ac612cb2cc1a33f4205976386d237d676319 (diff) | |
i386: clarify that the Q35 machine type implements a P35 chipset
The 'q35' machine type implements an Intel Series 3 chipset,
of which there are several variants:
https://www.intel.com/Assets/PDF/datasheet/316966.pdf
The key difference between the 82P35 MCH ('p35', PCI device ID 0x29c0)
and 82Q35 GMCH ('q35', PCI device ID 0x29b0) variants is that the latter
has an integrated graphics adapter. QEMU does not implement integrated
graphics, so uses the PCI ID for the 82P35 chipset, despite calling the
machine type 'q35'. Thus we rename the PCI device ID constant to reflect
reality, to avoid confusing future developers. The new name more closely
matches what pci.ids reports it to be:
$ grep P35 /usr/share/hwdata/pci.ids | grep 29
29c0 82G33/G31/P35/P31 Express DRAM Controller
29c1 82G33/G31/P35/P31 Express PCI Express Root Port
29c4 82G33/G31/P35/P31 Express MEI Controller
29c5 82G33/G31/P35/P31 Express MEI Controller
29c6 82G33/G31/P35/P31 Express PT IDER Controller
29c7 82G33/G31/P35/P31 Express Serial KT Controller
$ grep Q35 /usr/share/hwdata/pci.ids | grep 29
29b0 82Q35 Express DRAM Controller
29b1 82Q35 Express PCI Express Root Port
29b2 82Q35 Express Integrated Graphics Controller
29b3 82Q35 Express Integrated Graphics Controller
29b4 82Q35 Express MEI Controller
29b5 82Q35 Express MEI Controller
29b6 82Q35 Express PT IDER Controller
29b7 82Q35 Express Serial KT Controller
Arguably the QEMU machine type should be named 'p35'. At this point in
time, however, it is not worth the churn for management applications &
documentation to worry about renaming it.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20180830105757.10577-1-berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/pci/pci_ids.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/hw/pci/pci_ids.h b/include/hw/pci/pci_ids.h index 63acc722a9..eeb33018ad 100644 --- a/include/hw/pci/pci_ids.h +++ b/include/hw/pci/pci_ids.h @@ -255,7 +255,7 @@ #define PCI_DEVICE_ID_INTEL_82801I_EHCI2 0x293c #define PCI_DEVICE_ID_INTEL_82599_SFP_VF 0x10ed -#define PCI_DEVICE_ID_INTEL_Q35_MCH 0x29c0 +#define PCI_DEVICE_ID_INTEL_P35_MCH 0x29c0 #define PCI_VENDOR_ID_XEN 0x5853 #define PCI_DEVICE_ID_XEN_PLATFORM 0x0001 |