On 11/12, Igor Mammedov wrote: > !-------------------------------------------------------------------| > This Message Is From an External Sender > This message came from outside your organization. > |-------------------------------------------------------------------! > > On Tue, 12 Nov 2024 12:33:58 +0100 > Gerd Hoffmann <kra...@redhat.com> wrote: > > > On Thu, Oct 24, 2024 at 12:36:16PM +0200, Claudio Fontana wrote: > > > > > What do we lose by just reverting things to the state that actually > > > worked? > > > > Well, the world is moving forward, devices getting more memory and > > larger pci bars. GPUs can have multi-GB pci bars these days. nvidia > > has a NPU with a 128 GB pci bar. Note this is larger than the whole > > (initial) PAE address space. I want seabios supporting that kind of > > devices well. > > > > The range of configurations becomes more and more wide, with huge > > devices as mentioned above on one end and old 32-bit guests on the > > other end. Have seabios automatically setup itself turned out to be a > > hard problem (as this thread clearly shows). > > > > We already have a runtime config switch to force 32-bit friendly setup > > (turn off long mode support in the vcpu). > > > > We already have a heuristic to select the 32-bit friendly setup, which > > right now is simply "no memory above 4G is present". > > > > The options I see to move this forward: > > > > (1) Tweak the heuristic. > > (1a) Raise the memory limit.
It seems to me that the thinking here is backwards, the change to the heuristic behavior was a regression from the standpoint of QEMU, an upgraded bios bricked existing guests. Should it not be the case that '32bit-friendly' is enabled by default, and a runtime config switch is provided to expose the expanded PCI BAR space? If you want the new thing - supply the new flag? -- Max Tottenham | Senior Software Engineer /(* Akamai Technologies _______________________________________________ SeaBIOS mailing list -- seabios@seabios.org To unsubscribe send an email to seabios-le...@seabios.org
