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Re: [Qemu-devel] vmx support for qemu
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] vmx support for qemu |
Date: |
Fri, 4 Nov 2016 12:46:36 +0000 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Wed, Oct 26, 2016 at 03:16:25PM +0300, poletaev wrote:
> Hello. I am trying to make realization of vmx for qemu.
>
> For now it can:
>
> - decode vmx instructions, vmx determination and vmx MSRs reading is
> supported
>
> - handle interrupts, exceptions, vm exits due to cr 0/4 exits, cr shadowing
> is supported
>
> - run bios POST and some amount of guest code in VirtualBox (tested on 5+
> version). Current problem here is a strange wish of hypervisor to change
> processor mode in vmx non-root to vm86 and find ill_op there. I have no
> ideas, why VirtualBox wants it (may be someone knows?).
>
> - configure guest in kvm, but guest can't run due to #PF which kvm can't
> handle right on my realization. Details: when kvm configures guest and
> enters in it, #PF with 0xfe05b address happens. Kvm goes to handle #PF.
> kvm_mmu_page_fault goes to nonpaging_page_fault, which don't find page in
> cache and calls nonpaging_map. nonpaging_map exits after critical section
> before out_unlock label. For me reaction looks normal, but I didn't dig
> deeper. After #PF handling kvm enters to guest again and falls to kvm again
> with #PF on 0xfe05b. This situation repeats infinitely.
>
>
>
> If somebody have an interest in subject, he can find sources here
> https://github.com/ispras/qemu.git , branch vmx.
If you want more attention I suggest sending an RFC patch series to
address@hidden
Guidelines for submitting patches are here:
http://qemu-project.org/Contribute/SubmitAPatch
Stefan
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