On Di, 2016-05-17 at 14:44 -0600, Alex Williamson wrote: > QEMU provides two fw_cfg files to support IGD. The first holds the > OpRegion data which holds the Video BIOS Table (VBT). This needs to > be copied into reserved memory and the address stored in the ASL > Storage register of the device at 0xFC offset in PCI config space. > The OpRegion is generally 8KB. This file is named "etc/igd-opregion". > > The second file tells us the required size of the stolen memory space > for the device. This space requires 1MB alignment and is generally > either 1MB to 8MB depending on hardware config, but may be hundreds of > MB for user specified stolen memory. The base address of the reserved > memory allocated for this is written back to the Base Data of Stolen > Memory register (BDSM) at PCI config offset 0x5C on the device. This > file is named "etc/igd-bdsm-size". > > QEMU documents these fw_cfg entries in docs/igd-assign.txt. > > Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx> > --- > > v6: fw_cfg BDSM entry now holds an 8-byte size integer as suggested > by Gerd. Also renamed to etc/igd-bdsm-size. Filter based on bdf > to only make use of this for the Intel VGA device at address > 00:02.0, not that QEMU should attach this to anything else. > > As always, comments appreciated. I expect this will be on hold > pending the QEMU support: > > http://thread.gmane.org/gmane.comp.emulators.kvm.devel/152123 qemu patches are merged meanwhile. Patch applied to master and cherry-picked into 1.9-stable. thanks, Gerd -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
