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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 13:31:42 -0600 |
User-agent: |
Notmuch/0.13.2+93~ged93d79 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) |
Paolo Bonzini <address@hidden> writes:
> Il 21/02/2013 18:12, David Woodhouse ha scritto:
>>> > 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.
>>
>> 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?
>
> I don't think you want to do that. It would be really slow, it would
> trade some emulation bugs for others, and people who mind security would
> not appreciate the additional attack surface of TCG.
>
> (BTW, that's how the very first version of KVM worked. It didn't use
> hardware virtualization at all until entering 64-bit mode, IIRC).
Pre-released versions, yes. Avi started with emulating up to 64-bit and
worked up from there. None of the public versions ever implemented
this.
Regards,
Anthony Liguori
>
> I think we just have to fix it in 1.5, and suggest a newer kernel to
> everyone else.
>
> Paolo
- Re: [Qemu-devel] [RFC PATCH] Distinguish between reset types, (continued)
- Re: [Qemu-devel] [edk2] [RFC PATCH] Distinguish between reset types, David Woodhouse, 2013/02/21
- Re: [Qemu-devel] [edk2] [RFC PATCH] Distinguish between reset types, Anthony Liguori, 2013/02/21
- Re: [Qemu-devel] [edk2] [RFC PATCH] Distinguish between reset types, David Woodhouse, 2013/02/21
- Re: [Qemu-devel] [edk2] [RFC PATCH] Distinguish between reset types, Laszlo Ersek, 2013/02/21
- Re: [Qemu-devel] [edk2] [RFC PATCH] Distinguish between reset types, David Woodhouse, 2013/02/21
- Re: [Qemu-devel] [edk2] [RFC PATCH] Distinguish between reset types, Paolo Bonzini, 2013/02/21
- Re: [Qemu-devel] [edk2] [RFC PATCH] Distinguish between reset types,
Anthony Liguori <=
- Re: [Qemu-devel] [edk2] [RFC PATCH] Distinguish between reset types, Laszlo Ersek, 2013/02/21
- Re: [Qemu-devel] [edk2] [RFC PATCH] Distinguish between reset types, Anthony Liguori, 2013/02/21
- [Qemu-devel] OvmfPkg reset [was: Distinguish between reset types], Laszlo Ersek, 2013/02/21
- Re: [Qemu-devel] [edk2] OvmfPkg reset [was: Distinguish between reset types], Paolo Bonzini, 2013/02/21
- Re: [Qemu-devel] [edk2] OvmfPkg reset [was: Distinguish between reset types], Laszlo Ersek, 2013/02/21
- Re: [Qemu-devel] [RFC PATCH] Distinguish between reset types, David Woodhouse, 2013/02/20
- Re: [Qemu-devel] [RFC PATCH] Distinguish between reset types, Paolo Bonzini, 2013/02/19
- Re: [Qemu-devel] [RFC PATCH] Distinguish between reset types, Peter Maydell, 2013/02/19
- Re: [Qemu-devel] [RFC PATCH] Distinguish between reset types, Peter Crosthwaite, 2013/02/20
- Re: [Qemu-devel] [RFC PATCH] Distinguish between reset types, Peter Maydell, 2013/02/20