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Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device settin
From: |
Alexander Graf |
Subject: |
Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device setting |
Date: |
Thu, 27 Sep 2012 11:29:26 +0200 |
On 27.09.2012, at 11:21, Avik Sil wrote:
> Hi,
>
> We would like to get a method to boot from devices provided in -boot
> arguments in qemu when the 'boot-device' is set in nvram for pseries machine.
> I mean the boot device specified in -boot should get a precedence over the
> 'boot-device' specified in nvram.
>
> At the same time, when -boot is not provided, i.e., the default boot order
> "cad" is present, the device specified in nvram 'boot-device' should get
> precedence if it is set.
>
> What should be the elegant way to implement this requirement? Suggestions
> welcome.
I would like to see us reuse the same methods that all the other platforms are
using (x86, OpenBIOS PPC, etc). On these machines we have fw_cfg which can tell
firmware configuration bits that the hypervisor can pass in.
However, using MMIO might be a bad idea for that one, since 970 HV KVM can not
handle that. So how about adding a hypercall based fw_cfg interface in parallel
to the current MMIO/PIO based one?
That way we could reuse almost all of the existing infrastructure.
Alex
- Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device setting, (continued)
- Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device setting, Gleb Natapov, 2012/09/27
- Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device setting, Nikunj A Dadhania, 2012/09/27
- Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device setting, Gleb Natapov, 2012/09/27
- Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device setting, Nikunj A Dadhania, 2012/09/27
- Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device setting, Gleb Natapov, 2012/09/27
- Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device setting, Benjamin Herrenschmidt, 2012/09/27
- Re: [Qemu-ppc] [Qemu-devel] Qemu boot device precedence over nvram boot-device setting, Gleb Natapov, 2012/09/27
- Re: [Qemu-ppc] [Qemu-devel] Qemu boot device precedence over nvram boot-device setting, Jordan Justen, 2012/09/28
Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device setting,
Alexander Graf <=