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From: Hollis Blanchard <hollisb@us.ibm.com>
To: kvm-ppc@vger.kernel.org
Subject: large page size virtio issues
Date: Tue, 04 Nov 2008 22:14:20 +0000	[thread overview]
Message-ID: <1225836860.15410.32.camel@localhost.localdomain> (raw)

Hi Rusty, I'm using a patch that changes the Linux base page size to
64K. (This is actually pretty common in ppc64 world, but I happen to be
trying it on ppc32.)

I'm seeing a problem with virtio. I think at least part of it can be
explained by qemu's TARGET_PAGE_BITS=12, and the guest's
PAGE_SHIFT=16. The guest allocates the queue, then passes the pfn (pa
>> PAGE_SHIFT) to the virtio backend (vp_find_vq()). The backend then
calculates the pa as pfn << TARGET_PAGE_BITS.

I have to run right now, but quickly changing qemu TARGET_PAGE_BITS to
16 got me a little further but still didn't work. Any thoughts?

Thanks!

-- 
Hollis Blanchard
IBM Linux Technology Center


             reply	other threads:[~2008-11-04 22:14 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-04 22:14 Hollis Blanchard [this message]
2008-11-05 12:16 ` large page size virtio issues Rusty Russell
     [not found]   ` <200811052316.47127.rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2008-11-05 19:50     ` Hollis Blanchard
2008-11-05 19:50       ` Hollis Blanchard
2008-11-05 20:08       ` Anthony Liguori
2008-11-05 20:08         ` Anthony Liguori
     [not found]         ` <4911FD32.9050301-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-11-05 20:29           ` Hollis Blanchard
2008-11-05 20:29             ` Hollis Blanchard
2008-11-05 14:06 ` Anthony Liguori
     [not found]   ` <4911A87A.4010209-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-11-05 16:32     ` Hollis Blanchard
2008-11-05 16:32       ` Hollis Blanchard
     [not found]       ` <1225902738.26835.51.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2008-11-05 17:25         ` Anthony Liguori
2008-11-05 17:25           ` Anthony Liguori
2008-11-05 17:31           ` Hollis Blanchard
2008-11-05 17:31             ` Hollis Blanchard
     [not found]             ` <1225906304.26835.75.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2008-11-05 17:33               ` Anthony Liguori
2008-11-05 17:33                 ` Anthony Liguori
2008-11-05 17:46                 ` Hollis Blanchard
2008-11-05 17:46                   ` Hollis Blanchard

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