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Re: [Qemu-devel] Merging kvm-apic into qemu-kvm
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] Merging kvm-apic into qemu-kvm |
Date: |
Thu, 26 Jan 2012 16:25:10 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2012-01-26 16:15, Avi Kivity wrote:
> The changes to kvm-apic are so drastic, that merging them into qemu-kvm
> in the normal way won't work. I can consider just dropping the existing
> implementation and switching to the new one, but the comment at the end
>
> Make the basic in-kernel irqchip support selectable via
> -machine ...,kernel_irqchip=on. Leave it off by default until it can
> fully replace user space models.
>
> suggests that things are still missing.
>
> Jan, what's still missing?
- in-kernel PIT (patches done, waiting for some upstream bits to be
merged first)
- TPR acceleration via VAPIC (WIP)
- MSI support
The latter is the big chunk. It requires quite some
refactoring/enhancement of the MSI layer. I posted the first version
last year. We need to agree on the design, then probably switch qemu-kvm
over while pushing generic bits upstream. And then we can extend the
upstream in-kernel *PIC using that new interfaces. Once upstream works
with MSI, we can switch qemu-kvm over, leaving basically only
device-assignment as the last missing bit.
> Any idea on how to proceed?
I had a qemu-kvm branch here that disables the upstream in-kernel *PIC
in favor of its current version. I still need to refresh that work (was
based on an earlier revision), but it was not that horrible. Let me check...
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
- [Qemu-devel] Merging kvm-apic into qemu-kvm, Avi Kivity, 2012/01/26
- Re: [Qemu-devel] Merging kvm-apic into qemu-kvm,
Jan Kiszka <=
- Re: [Qemu-devel] Merging kvm-apic into qemu-kvm, Jan Kiszka, 2012/01/26
- Re: [Qemu-devel] Merging kvm-apic into qemu-kvm, Avi Kivity, 2012/01/26
- Re: [Qemu-devel] Merging kvm-apic into qemu-kvm, Jan Kiszka, 2012/01/26
- Re: [Qemu-devel] Merging kvm-apic into qemu-kvm, Avi Kivity, 2012/01/26
- Re: [Qemu-devel] Merging kvm-apic into qemu-kvm, Jan Kiszka, 2012/01/27
- Re: [Qemu-devel] Merging kvm-apic into qemu-kvm, Avi Kivity, 2012/01/29
- Re: [Qemu-devel] Merging kvm-apic into qemu-kvm, Avi Kivity, 2012/01/29
- Re: [Qemu-devel] Merging kvm-apic into qemu-kvm, Jan Kiszka, 2012/01/29
- Re: [Qemu-devel] Merging kvm-apic into qemu-kvm, Avi Kivity, 2012/01/29
- Re: [Qemu-devel] Merging kvm-apic into qemu-kvm, Jan Kiszka, 2012/01/29