On 04/13/2010 03:29 PM, Yinghai wrote: >> >> We have talked about a need to resolve this before. > > current code for mmio that is just below 4g, if some PCI BAR use that range, and those range is falling into E820_RESERVED, > > those range still can be claimed, but driver can not use pci_request_region() later. > > So We still > 1. rely that BIOS does not reserve the [0xa0000, 0xe0000) > 2. kernel only reserve the range when we make sure these is legacy device on that range. > This really isn't sufficient. There are systems in the field which marks a memory range reserved in E820 because it a device pointed there, and it doesn't want that device moved because it is used by an SMM handler. This was reported quite a while ago (like two years.) I can dig up the thread if it matters. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
