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.
Signed-off-by: Alex Williamson alex.williamson@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) { + 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, };