From: Marcelo Tosatti <mtosatti@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Chris Wright <chrisw@redhat.com>, Avi Kivity <avi@redhat.com>,
Dor Laor <dlaor@redhat.com>,
kvm@vger.kernel.org
Subject: Re: qemu-kvm: require 4K aligned resource size for memory
Date: Thu, 22 Oct 2009 14:37:39 -0200 [thread overview]
Message-ID: <20091022163739.GA4353@amt.cnet> (raw)
In-Reply-To: <20091020171508.GD13378@redhat.com>
On Tue, Oct 20, 2009 at 07:15:09PM +0200, Michael S. Tsirkin wrote:
> KVM does not virtualize low address bits for memory accesses, so we must
> require that PCI BAR size is a multiple of 4K for passthrough to work
> (this also guarantees that address is 4K aligned).
>
> Users of recent linux kernels can force resource size up to 4K
> using:
>
> commit 32a9a682bef2f6fce7026bd94d1ce20028b0e52d
> Author: Yuji Shimada <shimada-yxb@necst.nec.co.jp>
> Date: Mon Mar 16 17:13:39 2009 +0900
> PCI: allow assignment of memory resources with a specified alignment
>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Applied, thanks.
prev parent reply other threads:[~2009-10-22 16:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-20 17:15 qemu-kvm: require 4K aligned resource size for memory Michael S. Tsirkin
2009-10-22 6:42 ` Chris Wright
2009-10-22 9:18 ` Michael S. Tsirkin
2009-10-22 16:37 ` Marcelo Tosatti [this message]
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