On Thu, 2023-05-11 at 15:05 +0200, Corvin Köhne wrote: > Hi, > > this is the next patch series, it'd like to send to the EDKII > project. > It enables bus enumeration. The use case for this is PCI ROM support. > > Enabling bus enumeration means that the firmware reassigns the > address > of the BAR of all PCI devices and executes PCI ROMs if it find some. > Our > previous approach was that bhyve assigns the address of all BARs. > This > is required in cases were no firmware is available like booting with > bhyveload or grub2-bhyve. While reassigning BARs in guest firmware > seems > unnecessary, it's required to fully support PCI ROMs. > > Some use cases where bus enumeration is required: > 1. GPU passthrough > Here bus enumeration solves two issues: > 1. The ROM can contain a GOP driver. This is required for > graphical > output before the OS driver is loaded. > 2. The linux drm driver has a dependency on the ROM. As GPU ROMs > are > shadowed in system memory, it searches for this shadowed > version. > So, drm won't be able to find the ROM if bus enumeration is > disabled and refuses to load. > 2. NIC passthrough > The ROM can contain a PXE driver which is required to PXE boot > from > this device. > > Any feedback is appreciated. > > > Thanks, > Corvin > > Corvin Köhne (3): > Revert "OvmfPkg/Bhyve: consume PciHostBridgeLibScan" > Revert "OvmfPkg/Bhyve: remove IncompatiblePciDeviceSupport DXE > driver" > OvmfPkg/BhyveBhfPkg: enable bus enumeration > > OvmfPkg/Bhyve/BhyveX64.dsc | 4 ++-- > OvmfPkg/Bhyve/BhyveX64.fdf | 1 + > 2 files changed, 3 insertions(+), 2 deletions(-) >
If I don't get any feedback within a week, I'm going to send this patch series to the EDKII project. -- Kind regards, Corvin
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