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Re: [Qemu-devel] Re: [Bug 596106] Re: kvm to emulate 64 bit cpu on 32 bi
From: |
Jamie Lokier |
Subject: |
Re: [Qemu-devel] Re: [Bug 596106] Re: kvm to emulate 64 bit cpu on 32 bit host |
Date: |
Sun, 20 Jun 2010 14:31:56 +0100 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
Paolo Bonzini wrote:
> On 06/19/2010 03:01 PM, Natalia Portillo wrote:
> >VMWare is able to do it, we should be able.
>
> They do it like TCG does it, not like KVM.
I heard rumours VMWare use KVM-style chip virtualisation when running
a 64-bit guest on a 32-bit host kernel on 64-bit hardware.
If true, that makes particular sense for Windows host users, who can't
just drop in a 64-bit host kernel without breaking their userspace
thoroughly. (If it was that easy, 64-bit Windows wouldn't use
a surruptitious VM to run 32-bit apps :-).
It seems like a good way for Windows users to run a single 64-bit app
on an otherwise 32-bit system that's working fine.
On Linux hosts I would expect you can drop in a 64-bit kernel, while
continuing to run a 32-bit userspace. But I don't know if (a) that's
entirely true, and (b) if distro packaging blocks that sort of thing
from being easy.
Unfortunately even that doesn't help people who just want to run a
64-bit VM as an ordinary user and aren't permitted to change their
Linux host kernel, e.g. a shared system, or some rented servers.
-- Jamie
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