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Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set |
Date: |
Fri, 17 Jun 2016 12:49:05 -0300 |
User-agent: |
Mutt/1.6.1 (2016-04-27) |
On Fri, Jun 17, 2016 at 05:28:03PM +0200, Paolo Bonzini wrote:
> On 17/06/2016 17:19, Eduardo Habkost wrote:
> > > > So, what happens if the guest play tricks in bits 40-45 when QEMU
> > > > sets the limit to 40 but we are running in a 46-bit host? Is it
> > > > really a problem? I assumed it would be safe.
> > >
> > > The guest expects a "reserved bit set" page fault, but doesn't get one.
> >
> > Wait, are you talking about migration only, or are you really
> > talking about running current QEMU (hardcoded to 40) on a 46-bit
> > host? I'm not talking about migration, above.
>
> I'm talking about both. :(
>
> > We really can't emulate a 40-bit machine in a 46-bit host? I
> > didn't expect that.
>
> Unfortunately that's the case. :(
OK, so please ignore all my suggestions about choosing reasonable
defaults based on VM size, etc.
Now all options look bad, and we need to choose the least harmful
as the default... I need to re-read this thread to be able to
give an opinion.
--
Eduardo
- Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set, (continued)
- Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set, Dr. David Alan Gilbert, 2016/06/17
- Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set, Paolo Bonzini, 2016/06/17
- Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set, Eduardo Habkost, 2016/06/17
- Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set, Paolo Bonzini, 2016/06/17
- Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set, Eduardo Habkost, 2016/06/17
- Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set, Paolo Bonzini, 2016/06/17
- Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set,
Eduardo Habkost <=
- [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set), Eduardo Habkost, 2016/06/21
- Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set), Paolo Bonzini, 2016/06/22
- Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set), Andrea Arcangeli, 2016/06/22
- Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set), Paolo Bonzini, 2016/06/22
- Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set), Andrea Arcangeli, 2016/06/22
- Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set), Paolo Bonzini, 2016/06/22
- Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set), Andrea Arcangeli, 2016/06/22
- Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set), Michael S. Tsirkin, 2016/06/22
- Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set), Andrea Arcangeli, 2016/06/22
- Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set), Michael S. Tsirkin, 2016/06/22