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Re: [Qemu-devel] [edk2] [RFC PATCH] Distinguish between reset types


From: Anthony Liguori
Subject: Re: [Qemu-devel] [edk2] [RFC PATCH] Distinguish between reset types
Date: Thu, 21 Feb 2013 11:32:24 -0600
User-agent: Notmuch/0.13.2+93~ged93d79 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu)

David Woodhouse <address@hidden> writes:

> On Thu, 2013-02-21 at 18:10 +0100, Laszlo Ersek wrote:
>> Since
>> - I like kvm, and
>> - I cannot easily change my hardware (which doesn't support UG), and
>> - I prefer to run the RHEL-6 kernel which has "old" KVM,
>> I depend on David's fix for the PAM registers.
>
> Which means your suspend/resume is broken. Yay! :)
>
> Anthony's patchset should hopefully fix that.

Will post a new version later today.  Am testing now with Laszlo's mock
up from a previous note.

I'm also going to write a qtest test case to try and validate all of
this behavior (minus the KVM bits).

> I wonder what it would take to work around the KVM bug in qemu though;
> can we actually *emulate* 16-bit mode instead of using KVM, on the
> kernels where KVM is broken? And then transition back to using KVM when
> we switch to 32-bit or 64-bit mode?

It's in the realm of possibility but ugly enough that we never did it.

I even worked on this way back in the day with Xen.  It sucked pretty
bad.  The challenge in support SMP eventually scared me off of it.

http://new-wiki.xen.org/old-wiki/xenwiki/HVM/V2E.html

Regards,

Anthony Liguori

>
> -- 
> dwmw2



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