On Tue, 02 Feb 2016 13:10:37 -0700 Alex Williamson <alex.william...@redhat.com> wrote:
> When assigning Intel IGD graphics via QEMU/vfio, the OpRegion for the > device may be exposed as a fw_cfg file. Allocate space for this, copy > the contents and write the ASL Storage register (0xFC) to point to > this buffer. NB, it's possible for QEMU to use the write to the ASL > Storage register to map access to the host OpRegion overlapping the > allocated buffer, but we shouldn't care if it does. > > References: > kernel vfio opregion support: > https://lkml.org/lkml/2016/2/1/884 > QEMU vfio opregion support (revised v2 of 7/7 adds fw_cfg): > https://lists.gnu.org/archive/html/qemu-devel/2016-02/msg00202.html > Gerd's IGD assignment series: > https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg00244.html > > Signed-off-by: Alex Williamson <alex.william...@redhat.com> > --- > src/fw/pciinit.c | 30 ++++++++++++++++++++++++++++++ > 1 file changed, 30 insertions(+) > > diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c > index c31c2fa..92170d5 100644 > --- a/src/fw/pciinit.c > +++ b/src/fw/pciinit.c > @@ -257,6 +257,32 @@ static void ich9_smbus_setup(struct pci_device *dev, > void *arg) > pci_config_writeb(bdf, ICH9_SMB_HOSTC, ICH9_SMB_HOSTC_HST_EN); > } > > +static void intel_igd_opregion_setup(struct pci_device *dev, void *arg) > +{ > + struct romfile_s *file = romfile_find("etc/igd-opregion"); > + void *opregion; > + u16 bdf = dev->bdf; > + > + if (!file || !file->size) > + return; > + > + opregion = memalign_high(PAGE_SIZE, file->size); > + if (!opregion) { > + warn_noalloc(); > + return; > + } > + > + if (file->copy(file, opregion, file->size) < 0) { Is opregion content on host immutable? if not then copying it probably wrong and it should be passed-through. > + free(opregion); > + return; > + } > + > + pci_config_writel(bdf, 0xFC, cpu_to_le32((u32)opregion)); > + > + dprintf(1, "Intel IGD OpRegion enabled on %02x:%02x.%x\n", > + pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf), pci_bdf_to_fn(bdf)); > +} > + > static const struct pci_device_id pci_device_tbl[] = { > /* PIIX3/PIIX4 PCI to ISA bridge */ > PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_0, > @@ -290,6 +316,10 @@ static const struct pci_device_id pci_device_tbl[] = { > PCI_DEVICE_CLASS(PCI_VENDOR_ID_APPLE, 0x0017, 0xff00, apple_macio_setup), > PCI_DEVICE_CLASS(PCI_VENDOR_ID_APPLE, 0x0022, 0xff00, apple_macio_setup), > > + /* Intel IGD OpRegion setup */ > + PCI_DEVICE_CLASS(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA, > + intel_igd_opregion_setup), > + > PCI_DEVICE_END, > }; > > > > _______________________________________________ > SeaBIOS mailing list > seab...@seabios.org > http://www.seabios.org/mailman/listinfo/seabios
