* Re: kvm vmx shadow paging question
[not found] <9253e6f9-8c49-97e6-b602-6e93e2977c3c@nextfour.com>
@ 2016-08-13 15:47 ` Mika Penttilä
2016-08-15 14:12 ` Mika Penttilä
0 siblings, 1 reply; 2+ messages in thread
From: Mika Penttilä @ 2016-08-13 15:47 UTC (permalink / raw)
To: kvm, LKML
On 13.08.2016 17:38, Mika Penttilä wrote:
> Hi,
>
> While studying the vmx code, and the shadow page tables usage (no ept involved),
> I wondered the GUEST_CR3 usage. If no ept, GUEST_CR3 points to the shadow tables.
> But the format of sptes is always 64 bit. How is that with 32 bit hosts, is the GUEST_CR3
> similar to EPT format, 4 level 64 bit always or how is this working on 32 bit?
>
> Thanks,
> Mika
>
Hmm seems non PAE 32 bit host without ept enabled is not supported combination, right ?
--Mika
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: kvm vmx shadow paging question
2016-08-13 15:47 ` kvm vmx shadow paging question Mika Penttilä
@ 2016-08-15 14:12 ` Mika Penttilä
0 siblings, 0 replies; 2+ messages in thread
From: Mika Penttilä @ 2016-08-15 14:12 UTC (permalink / raw)
To: kvm, LKML
On 13.08.2016 18:47, Mika Penttilä wrote:
> On 13.08.2016 17:38, Mika Penttilä wrote:
>
>> Hi,
>>
>> While studying the vmx code, and the shadow page tables usage (no ept involved),
>> I wondered the GUEST_CR3 usage. If no ept, GUEST_CR3 points to the shadow tables.
>> But the format of sptes is always 64 bit. How is that with 32 bit hosts, is the GUEST_CR3
>> similar to EPT format, 4 level 64 bit always or how is this working on 32 bit?
>>
>> Thanks,
>> Mika
>>
> Hmm seems non PAE 32 bit host without ept enabled is not supported combination, right ?
>
> --Mika
>
>
Ping, am I correct that for using shadow mmu with x86 kvm host you need at least 32bit PAE enabled host
(because shadow ptes are always 64 bit, in PAE or long format)?
--Mika
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-08-13 15:47 ` kvm vmx shadow paging question Mika Penttilä
2016-08-15 14:12 ` Mika Penttilä
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