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Re: [Qemu-devel] [RFC] Next gen kvm api
From: |
Scott Wood |
Subject: |
Re: [Qemu-devel] [RFC] Next gen kvm api |
Date: |
Mon, 6 Feb 2012 13:46:21 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2 |
On 02/03/2012 04:52 PM, Anthony Liguori wrote:
> On 02/03/2012 12:07 PM, Eric Northup wrote:
>> On Thu, Feb 2, 2012 at 8:09 AM, Avi Kivity<address@hidden> wrote:
>> [...]
>>>
>>> Moving to syscalls avoids these problems, but introduces new ones:
>>>
>>> - adding new syscalls is generally frowned upon, and kvm will need
>>> several
>>> - syscalls into modules are harder and rarer than into core kernel code
>>> - will need to add a vcpu pointer to task_struct, and a kvm pointer to
>>> mm_struct
>> - Lost a good place to put access control (permissions on /dev/kvm)
>> for which user-mode processes can use KVM.
>>
>> How would the ability to use sys_kvm_* be regulated?
>
> Why should it be regulated?
>
> It's not a finite or privileged resource.
You're exposing a large, complex kernel subsystem that does very
low-level things with the hardware. It's a potential source of exploits
(from bugs in KVM or in hardware). I can see people wanting to be
selective with access because of that.
And sometimes it is a finite resource. I don't know how x86 does it,
but on at least some powerpc hardware we have a finite, relatively small
number of hardware partition IDs.
-Scott
- Re: [Qemu-devel] [RFC] Next gen kvm api, (continued)
- Re: [Qemu-devel] [RFC] Next gen kvm api, Anthony Liguori, 2012/02/07
- Re: [Qemu-devel] [RFC] Next gen kvm api, Alexander Graf, 2012/02/07
- Re: [Qemu-devel] [RFC] Next gen kvm api, Alan Cox, 2012/02/08
- Re: [Qemu-devel] [RFC] Next gen kvm api, Avi Kivity, 2012/02/15
- Re: [Qemu-devel] [RFC] Next gen kvm api, Arnd Bergmann, 2012/02/16
Re: [Qemu-devel] [RFC] Next gen kvm api, Jamie Lokier, 2012/02/09
Re: [Qemu-devel] [RFC] Next gen kvm api, Eric Northup, 2012/02/03
- Re: [Qemu-devel] [RFC] Next gen kvm api, Anthony Liguori, 2012/02/03
- Re: [Qemu-devel] [RFC] Next gen kvm api,
Scott Wood <=
- Re: [Qemu-devel] [RFC] Next gen kvm api, Michael Ellerman, 2012/02/07
- Re: [Qemu-devel] [RFC] Next gen kvm api, Alexander Graf, 2012/02/07
- Re: [Qemu-devel] [RFC] Next gen kvm api, Arnd Bergmann, 2012/02/16
- Re: [Qemu-devel] [RFC] Next gen kvm api, Michael Ellerman, 2012/02/15
- Re: [Qemu-devel] [RFC] Next gen kvm api, Avi Kivity, 2012/02/16
- Re: [Qemu-devel] [RFC] Next gen kvm api, Michael Ellerman, 2012/02/16
- Re: [Qemu-devel] [RFC] Next gen kvm api, Avi Kivity, 2012/02/18
Re: [Qemu-devel] [RFC] Next gen kvm api, Avi Kivity, 2012/02/16
Re: [Qemu-devel] [RFC] Next gen kvm api, Anthony Liguori, 2012/02/07
Re: [Qemu-devel] [RFC] Next gen kvm api, Avi Kivity, 2012/02/07