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Re: [Qemu-devel] drop -enable-nesting
From: |
Roedel, Joerg |
Subject: |
Re: [Qemu-devel] drop -enable-nesting |
Date: |
Mon, 30 May 2011 17:10:20 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, May 30, 2011 at 11:04:02AM -0400, Jan Kiszka wrote:
> On 2011-05-30 16:38, Nadav Har'El wrote:
> > On Mon, May 30, 2011, Jan Kiszka wrote about "drop -enable-nesting (was:
> > [PATCH 3/7] cpu model bug fixes and definition corrections...)":
> >> On 2011-05-30 10:18, Roedel, Joerg wrote:
> >>> On Sat, May 28, 2011 at 04:39:13AM -0400, Jan Kiszka wrote:
> >>>
> >>>> J�rg, how to deal with -enable-nesting in qemu-kvm to align behavior
> >>>> with upstream?
> >>>
> >>> My personal preference is to just remove it. In upstream-qemu it is
> >>> enabled/disabled by +/-svm. -enable-nesting is just a historic thing
> >>> which can be wiped out.
> >
> > "-enable-nesting" could remain as a synonym for enabling either VMX or SVM
> > in the guest, depending on what was available in the host (because KVM now
> > supports both nested SVM and nested VMX, but not SVM-on-VMX or vice versa).
>
> Why? Once nesting is stable (I think SVM already is), there is no reason
> for an explicit enable. And you can always mask it out via -cpu.
>
> BTW, what are the defaults for SVM right now in qemu-kvm and upstream?
> Enable if the modeled CPU supports it?
qemu-kvm still needs -enable-nesting, otherwise it is disabled. Upstream
qemu should enable it unconditionally (can be disabled with -cpu ,-svm).
Joerg
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- [Qemu-devel] [PATCH 3/7] cpu model bug fixes and definition corrections: Add kvm emulated x2apic flag to config defined cpu models, john cooper, 2011/05/23
- Re: [Qemu-devel] [PATCH 3/7] cpu model bug fixes and definition corrections: Add kvm emulated x2apic flag to config defined cpu models, Jan Kiszka, 2011/05/28
- Re: [Qemu-devel] [PATCH 3/7] cpu model bug fixes and definition corrections: Add kvm emulated x2apic flag to config defined cpu models, Roedel, Joerg, 2011/05/30
- [Qemu-devel] drop -enable-nesting (was: [PATCH 3/7] cpu model bug fixes and definition corrections...), Jan Kiszka, 2011/05/30
- Re: [Qemu-devel] drop -enable-nesting (was: [PATCH 3/7] cpu model bug fixes and definition corrections...), Nadav Har'El, 2011/05/30
- Re: [Qemu-devel] drop -enable-nesting, Jan Kiszka, 2011/05/30
- Re: [Qemu-devel] drop -enable-nesting,
Roedel, Joerg <=
- Re: [Qemu-devel] drop -enable-nesting, Jan Kiszka, 2011/05/30
- Re: [Qemu-devel] drop -enable-nesting, Avi Kivity, 2011/05/30
- Re: [Qemu-devel] drop -enable-nesting, Jan Kiszka, 2011/05/30
- Re: [Qemu-devel] drop -enable-nesting, Jan Kiszka, 2011/05/30
- Re: [Qemu-devel] drop -enable-nesting, Daniel P. Berrange, 2011/05/31
- Re: [Qemu-devel] drop -enable-nesting, Avi Kivity, 2011/05/31
- Re: [Qemu-devel] drop -enable-nesting, Roedel, Joerg, 2011/05/31
- Re: [Qemu-devel] drop -enable-nesting, Paolo Bonzini, 2011/05/31
- Re: [Qemu-devel] drop -enable-nesting, Avi Kivity, 2011/05/31
- Re: [Qemu-devel] drop -enable-nesting, Nadav Har'El, 2011/05/30