More queries on guest swapping in KVM

More queries on guest swapping in KVM

[Arn]

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Hi ,

Regarding the guest swapping mechanism (host ability to swap out guest
pages),

1) Can the host swap out any page of a guest VM ? (including the guest's
kernel pages)

2) Does the guest know its page has been swapped out or is this transparent
to the guest ? ( I think the guest
wouldn't know but I just want to be sure)

3) Is there any way the guest can prevent the host from swapping out its
pages ?

thanks
Arn

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Re: More queries on guest swapping in KVM

[Izik Eidus]

Arn wrote:
> Hi ,
>
> Regarding the guest swapping mechanism (host ability to swap out guest 
> pages),
>
> 1) Can the host swap out any page of a guest VM ? (including the 
> guest's kernel pages)

right now kvm can swap any pages but pages that are mapped in it mmu 
cache. (it doesnt matther if it kernel page or not)]
with mmu notifiers witch probably be marged to 2.6.26 we will be able to 
swap the entire pages of the guest.

>
> 2) Does the guest know its page has been swapped out or is this 
> transparent to the guest ? ( I think the guest
> wouldn't know but I just want to be sure)

it doesnt know.

>
> 3) Is there any way the guest can prevent the host from swapping out 
> its pages ?

not without writing new code.

>
> thanks
> Arn
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