From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
qemu-trivial@nongnu.org, qemu-devel <qemu-devel@nongnu.org>,
Alex Williamson <alex.williamson@redhat.com>,
qemu-ppc@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>,
Paul Mackerras <paulus@samba.org>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-trivial] [Qemu-ppc] [Qemu-devel] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support
Date: Mon, 24 Jun 2013 07:39:14 +1000 [thread overview]
Message-ID: <1372023554.3944.111.camel@pasglop> (raw)
In-Reply-To: <CA+aC4ksTsWTH23F2jXYPXGk4Ya7JD1a7Q8p7xD65vOiD57Z=qQ@mail.gmail.com>
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.
WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
qemu-trivial@nongnu.org, qemu-devel <qemu-devel@nongnu.org>,
Alex Williamson <alex.williamson@redhat.com>,
qemu-ppc@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>,
Paul Mackerras <paulus@samba.org>,
David Gibson <david@gibson.dropbear.id.au>
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 [thread overview]
Message-ID: <1372023554.3944.111.camel@pasglop> (raw)
In-Reply-To: <CA+aC4ksTsWTH23F2jXYPXGk4Ya7JD1a7Q8p7xD65vOiD57Z=qQ@mail.gmail.com>
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.
next prev parent reply other threads:[~2013-06-23 21:39 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-20 14:08 [Qemu-trivial] [PATCH] RFC kvm irqfd: add directly mapped MSI IRQ support Alexey Kardashevskiy
2013-06-20 14:08 ` [Qemu-devel] " Alexey Kardashevskiy
2013-06-20 15:38 ` [Qemu-trivial] " Michael S. Tsirkin
2013-06-20 15:38 ` [Qemu-devel] " Michael S. Tsirkin
2013-06-20 16:37 ` [Qemu-trivial] " Anthony Liguori
2013-06-20 16:37 ` Anthony Liguori
2013-06-20 23:51 ` [Qemu-trivial] " Alexey Kardashevskiy
2013-06-20 23:51 ` Alexey Kardashevskiy
2013-06-23 14:07 ` [Qemu-trivial] " Michael S. Tsirkin
2013-06-23 14:07 ` Michael S. Tsirkin
2013-06-23 15:02 ` [Qemu-trivial] " Anthony Liguori
2013-06-23 15:02 ` Anthony Liguori
2013-06-23 21:39 ` Benjamin Herrenschmidt [this message]
2013-06-23 21:39 ` [Qemu-devel] [Qemu-ppc] " Benjamin Herrenschmidt
2013-06-23 21:58 ` [Qemu-trivial] [Qemu-ppc] [Qemu-devel] " Anthony Liguori
2013-06-23 21:58 ` [Qemu-devel] [Qemu-ppc] " Anthony Liguori
2013-06-24 4:46 ` [Qemu-trivial] [Qemu-ppc] [Qemu-devel] " Alex Williamson
2013-06-24 4:46 ` [Qemu-devel] [Qemu-ppc] " Alex Williamson
2013-06-24 12:24 ` [Qemu-trivial] [Qemu-ppc] [Qemu-devel] " Anthony Liguori
2013-06-24 12:24 ` [Qemu-devel] [Qemu-ppc] " Anthony Liguori
2013-06-24 12:39 ` [Qemu-trivial] " Gleb Natapov
2013-06-24 12:39 ` Gleb Natapov
2013-06-23 21:36 ` [Qemu-trivial] [Qemu-devel] " Benjamin Herrenschmidt
2013-06-23 21:36 ` Benjamin Herrenschmidt
2013-06-24 12:10 ` [Qemu-trivial] " Michael S. Tsirkin
2013-06-24 12:10 ` Michael S. Tsirkin
2013-06-20 16:51 ` [Qemu-trivial] " Alex Williamson
2013-06-20 16:51 ` [Qemu-devel] " Alex Williamson
2013-06-21 1:56 ` [Qemu-trivial] " Alexey Kardashevskiy
2013-06-21 1:56 ` [Qemu-devel] " Alexey Kardashevskiy
2013-06-21 2:34 ` [Qemu-trivial] " Alex Williamson
2013-06-21 2:34 ` [Qemu-devel] " Alex Williamson
2013-06-21 2:49 ` [Qemu-trivial] " Alexey Kardashevskiy
2013-06-21 2:49 ` [Qemu-devel] " Alexey Kardashevskiy
2013-06-21 4:46 ` [Qemu-trivial] " Alex Williamson
2013-06-21 4:46 ` [Qemu-devel] " Alex Williamson
2013-06-21 5:12 ` [Qemu-trivial] " Benjamin Herrenschmidt
2013-06-21 5:12 ` [Qemu-devel] " Benjamin Herrenschmidt
2013-06-21 6:03 ` [Qemu-trivial] " Alex Williamson
2013-06-21 6:03 ` [Qemu-devel] " Alex Williamson
2013-06-21 6:12 ` [Qemu-trivial] " Benjamin Herrenschmidt
2013-06-21 6:12 ` [Qemu-devel] " Benjamin Herrenschmidt
2013-06-21 6:40 ` [Qemu-trivial] " Alexey Kardashevskiy
2013-06-21 6:40 ` [Qemu-devel] " Alexey Kardashevskiy
2013-06-23 15:06 ` [Qemu-trivial] " Anthony Liguori
2013-06-23 15:06 ` Anthony Liguori
2013-06-24 4:44 ` [Qemu-trivial] " Alex Williamson
2013-06-24 4:44 ` Alex Williamson
2013-06-24 12:25 ` [Qemu-trivial] " Anthony Liguori
2013-06-24 12:25 ` Anthony Liguori
2013-06-24 7:13 ` [Qemu-trivial] " Gleb Natapov
2013-06-24 7:13 ` Gleb Natapov
2013-06-24 12:32 ` [Qemu-trivial] " Anthony Liguori
2013-06-24 12:32 ` Anthony Liguori
2013-06-24 12:37 ` [Qemu-trivial] " Alexander Graf
2013-06-24 12:37 ` Alexander Graf
2013-06-24 13:06 ` [Qemu-trivial] " Gleb Natapov
2013-06-24 13:06 ` Gleb Natapov
2013-06-24 13:34 ` [Qemu-trivial] " Anthony Liguori
2013-06-24 13:34 ` Anthony Liguori
2013-06-24 13:41 ` [Qemu-trivial] " Michael S. Tsirkin
2013-06-24 13:41 ` Michael S. Tsirkin
2013-06-24 14:31 ` [Qemu-trivial] " Anthony Liguori
2013-06-24 14:31 ` Anthony Liguori
2013-06-24 14:34 ` [Qemu-trivial] " Alexander Graf
2013-06-24 14:34 ` Alexander Graf
2013-06-24 15:17 ` [Qemu-trivial] " Anthony Liguori
2013-06-24 15:17 ` Anthony Liguori
2013-06-24 16:48 ` [Qemu-trivial] " Gleb Natapov
2013-06-24 16:48 ` Gleb Natapov
2013-06-24 16:35 ` [Qemu-trivial] " Gleb Natapov
2013-06-24 16:35 ` Gleb Natapov
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