On Wed, Apr 9, 2014 at 4:53 PM, Peter Crosthwaite <peter.crosthwa...@xilinx.com> wrote: > Hi Andy, > > On Thu, Apr 10, 2014 at 5:55 AM, Andy Lutomirski <l...@amacapital.net> wrote: >> Currently, -M q35 boots linux quite a bit slower than the default >> machine type. This seems to be because it takes a few hundred ms to >> determine that there's nothing attached to the AHCI controller. >> >> In virtio setups, there will probably never be anything attached to >> the AHCI controller. Would it be possible to add something like >> -machine default_storage=off to turn off default storage devices? >> This could include the AHCI on q35 and the cdrom and such on pc. >> >> There's precedent: -machine usb=off turns off the default USB >> controllers, which is great for setups that use xhci. >> > > Is there a more generic solution to your problem? Can you implement > command line device removal in a non specific way and avoid having to > invent AHCI or even "storage" specific arguments. You could > considering bringing the xhci use case you mentioned under the same > umbrella.
An option like -suppress-default-device foobar to turn off the device named foobar would work, but what happens if that device is a bus? Will this just cause QEMU to crash? Maybe the machine code would have to opt in to allowing this kind of suppression, and there could be a general error of you try to suppress a device that can't be suppressed. I can try to code this up, but I know nothing about QEMU internals. I'm just a user :) --Andy
