Re: [Qemu-devel] [PATCH v2 1/5] fw_cfg: document fw_cfg_modify_iXX() update functions

[Peter Maydell]

On 1 September 2015 at 20:13, Gabriel L. Somlo <address@hidden> 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".
(For ARM we don't I think currently expose fw_cfg in the ACPI
tables, but we probably ought to; only needed for the edge
case where you actually wanted to read fw_cfg in the guest
kernel rather than just the guest firmware, though.)

thanks
-- PMM