From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Alexey Kardashevskiy <aik@ozlabs.ru>,
David Gibson <david@gibson.dropbear.id.au>
Cc: Alex Williamson <alex.williamson@redhat.com>,
kvm@vger.kernel.org, Eric Auger <eric.auger@redhat.com>
Subject: Re: [RFC PATCH kernel] vfio-pci: Allow write combining
Date: Mon, 16 Oct 2017 10:38:18 +0200 [thread overview]
Message-ID: <1508143098.25065.277.camel@kernel.crashing.org> (raw)
In-Reply-To: <67742d45-a267-0363-7448-7f8945f84c95@ozlabs.ru>
On Mon, 2017-10-16 at 18:36 +1100, Alexey Kardashevskiy wrote:
>
> 1. Allow msix mapping to the userspace (to address non-64k-aligned msix bar)
>
> 2. Allow write combining in vfio for the userspace (kvm guest is kinda
> special and may simply ignore mapping flags in some configs but PPC radix
> guests still rely on this)
Why ? The "G" bit is entirely under control of the guest afaik. This
would only affect qemu itself. It's still useful for things like dpdk
using vfio.
> 3. what callback and where needs to be added to inform HV/PR KVM about VFIO
> group, like IOMMUMR::add_vfio_group() proposal or something.
Can you elaborate a bit ? I haven't followed this.
Cheers,
Ben.
next prev parent reply other threads:[~2017-10-16 8:38 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-09 2:50 [RFC PATCH kernel] vfio-pci: Allow write combining Alexey Kardashevskiy
2017-10-10 21:55 ` Alex Williamson
2017-10-11 2:05 ` Alexey Kardashevskiy
2017-10-11 2:42 ` Alex Williamson
2017-10-11 2:56 ` Alexey Kardashevskiy
2017-10-11 15:35 ` Benjamin Herrenschmidt
2017-10-16 5:54 ` Alexey Kardashevskiy
2017-10-16 6:00 ` David Gibson
2017-10-16 7:36 ` Alexey Kardashevskiy
2017-10-16 8:01 ` David Gibson
2017-11-06 5:44 ` Alexey Kardashevskiy
2017-11-14 2:23 ` David Gibson
2017-11-14 2:29 ` Benjamin Herrenschmidt
2017-11-14 16:28 ` Alex Williamson
2017-11-24 4:58 ` Alexey Kardashevskiy
2017-11-29 18:47 ` Alex Williamson
2017-11-30 4:20 ` David Gibson
2017-11-30 20:06 ` Benjamin Herrenschmidt
2017-10-16 8:38 ` Benjamin Herrenschmidt [this message]
2017-10-16 11:11 ` Alexey Kardashevskiy
2017-10-18 7:33 ` Benjamin Herrenschmidt
2017-10-18 9:00 ` Alexey Kardashevskiy
2017-10-18 14:21 ` Benjamin Herrenschmidt
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