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Re: [Qemu-devel] [Qemu-ppc] [PATCH] RFC kvm irqfd: add directly mapped M
From: |
Benjamin Herrenschmidt |
Subject: |
Re: [Qemu-devel] [Qemu-ppc] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support |
Date: |
Mon, 24 Jun 2013 07:39:14 +1000 |
On Sun, 2013-06-23 at 10:02 -0500, Anthony Liguori wrote:
> It doesn't make a lot of sense to have Power do MSI decoding in
> userspace while x86 does it in the kernel. I assume the kernel
> doesn't have enough information to do the translation on Power?
Well, it would need the host bridge which it doesn't have and it
would need a concept of mapping that to interrupt numbers which
we don't want in the kernel.
We can keep the kernel side a LOT simpler (completely avoiding
the whole route bloatware) by sticking to our "simple" direct map kernel
stuff and doing the mapping from address/data to interrupts in qemu, so
we'll stick to that.
Cheers,
Ben.
- [Qemu-devel] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Alexey Kardashevskiy, 2013/06/20
- Re: [Qemu-devel] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Michael S. Tsirkin, 2013/06/20
- Re: [Qemu-devel] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Anthony Liguori, 2013/06/20
- Re: [Qemu-devel] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Alexey Kardashevskiy, 2013/06/20
- Re: [Qemu-devel] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Michael S. Tsirkin, 2013/06/23
- Re: [Qemu-devel] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Anthony Liguori, 2013/06/23
- Re: [Qemu-devel] [Qemu-ppc] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support,
Benjamin Herrenschmidt <=
- Re: [Qemu-devel] [Qemu-ppc] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Anthony Liguori, 2013/06/23
- Re: [Qemu-devel] [Qemu-ppc] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Alex Williamson, 2013/06/24
- Re: [Qemu-devel] [Qemu-ppc] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Anthony Liguori, 2013/06/24
- Re: [Qemu-devel] [Qemu-ppc] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Gleb Natapov, 2013/06/24
- Re: [Qemu-devel] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Benjamin Herrenschmidt, 2013/06/23
- Re: [Qemu-devel] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Michael S. Tsirkin, 2013/06/24
Re: [Qemu-devel] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support, Alex Williamson, 2013/06/20