> -----Original Message----- > From: Gerd Hoffmann [mailto:kraxel@xxxxxxxxxx] > Sent: Friday, November 02, 2012 5:00 PM > To: Hao, Xudong > Cc: kevin@xxxxxxxxxxxx; seabios@xxxxxxxxxxx; kvm@xxxxxxxxxxxxxxx; > avi@xxxxxxxxxx > Subject: Re: [PATCH] seabios/pci: enable 64 bit bar on seabios > > On 11/02/12 06:42, Xudong Hao wrote: > > 64 bit bar sizing and MMIO allocation. The 64 bit window is placed above high > > memory, top down from the end of guest physical address space. > > What problem you are trying to fix? The existing code should handle > 64bit bars just fine. By default they are placed below 4G though for > compatibility reasons (make old 32bit guests happy). When running out > of address space seabios will try map them above 4G though to make room > below 4G. > I just want to enable 64 bit bars for KVM usage, seabios 1.7.0 is used in current qemu-kvm, which not handle 64 bit bars yet. I cloned seabios code from kernel.org(seems no 64 bit bars supporting), but I was not taking notice of the tree on http://git.qemu.org/, yes it has already done 64 bit bars handling. So you may ignore this patch. Btw, when will the latest seabios(especially 64 bits bars) be involved qemu-kvm? > Mapping your 64bit PCI bars above 4G unconditionally (for testing or > other reasons) can simply be done this way: > > --- a/src/pciinit.c > +++ b/src/pciinit.c > @@ -599,7 +599,7 @@ static void pci_bios_map_devices(struct pci_bus > *busses) > { > pcimem_start = RamSize; > > - if (pci_bios_init_root_regions(busses)) { > + if (1 /* pci_bios_init_root_regions(busses) */) { > struct pci_region r64_mem, r64_pref; > r64_mem.list = NULL; > r64_pref.list = NULL; > > We might want add a config option for this. > > cheers, > 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
