On Di, 2015-09-01 at 21:10 +0100, Peter Maydell wrote: > On 1 September 2015 at 20:13, Gabriel L. Somlo <so...@cmu.edu> wrote: > > Also, since I'll be tinkering with fw_cfg again, and you mentioned > > using DT on arm and ACPI on x86 to auto-detect the presence (and location) > > of fw_cfg from the guest-side in a related thread: > > I meant DT or ACPI on ARM, actually. I don't know what the x86 > approach is for fw_cfg but I think it's just "known address".
Yes, "known address". And given that the firmware actually loads the acpi tables via fw_cfg that is very unlikely to change. Adding it to the acpi tables might be useful nevertheless so the guest os knows the ioports are in use. I think on arm the acpi situation is the same, but I think firmware detecting the location via DT should work without chicken&egg problems. cheers, Gerd
