[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of use
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors |
Date: |
Tue, 18 Oct 2011 17:55:54 +0200 |
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 2011-10-18 17:22, Jan Kiszka wrote:
> What KVM has to do is just mapping an arbitrary MSI message
> (theoretically 64+32 bits, in practice it's much of course much less) to
( There are 24 distinguishing bits in an MSI message on x86, but that's
only a current interpretation of one specific arch. )
> a single GSI and vice versa. As there are less GSIs than possible MSI
> messages, we could run out of them when creating routes, statically or
> lazily.
>
> What would probably help us long-term out of your concerns regarding
> lazy routing is to bypass that redundant GSI translation for dynamic
> messages, i.e. those that are not associated with an irqfd number or an
> assigned device irq. Something like a KVM_DELIVER_MSI IOCTL that accepts
> address and data directly.
This would be a trivial extension in fact. Given its beneficial impact
on our GSI limitation issue, I think I will hack up something like that.
And maybe this makes a transparent cache more reasonable. Then only old
host kernels would force us to do searches for already cached messages.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, (continued)
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Michael S. Tsirkin, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Michael S. Tsirkin, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Michael S. Tsirkin, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Michael S. Tsirkin, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Michael S. Tsirkin, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors,
Jan Kiszka <=
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Michael S. Tsirkin, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Michael S. Tsirkin, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Michael S. Tsirkin, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Jan Kiszka, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Michael S. Tsirkin, 2011/10/18
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Jan Kiszka, 2011/10/19
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Michael S. Tsirkin, 2011/10/19
- Re: [Qemu-devel] [RFC][PATCH 28/45] qemu-kvm: msix: Drop tracking of used vectors, Jan Kiszka, 2011/10/19