From: "Jan Beulich" <JBeulich@suse.com>
To: Sylwester Sosnowski <syso@datanoise.net>
Cc: xen-devel@lists.xen.org
Subject: Re: Issues with PCI-Passtrough (VT-d) in HVM with Xen 4.6
Date: Fri, 03 Jun 2016 05:52:18 -0600 [thread overview]
Message-ID: <57518B9202000078000F18C7@prv-mh.provo.novell.com> (raw)
In-Reply-To: <57509021.1060506@datanoise.net>
>>> On 02.06.16 at 21:59, <syso@datanoise.net> wrote:
> Temporary Fix
> -------------
>
> After checking the source[1] of the PCI configuration space
> handling in xen-pciback, I found out that changing line 258
> to read
>
> if (handled && !err) {
>
> instead of:
>
> if (!handled && !err) {
>
> solves the issue and I can successfully write to the interface.
This can't possibly a solution (see also the comment right there). But
without you telling us what register gets written with what value,
and what's being read back, I don't think there's much we can do or
suggest. In the end, by changing the conditional you force writes
that _did_ get emulated to _nevertheless_ also get carried out to
raw hardware. If that helps for your specific case, then it's quite
possible that something in the emulation paths invoked from the
code above that conditional is wrong.
Jan
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next prev parent reply other threads:[~2016-06-03 11:52 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-02 19:59 Issues with PCI-Passtrough (VT-d) in HVM with Xen 4.6 Sylwester Sosnowski
2016-06-02 20:06 ` Konrad Rzeszutek Wilk
2016-06-02 20:11 ` Sylwester Sosnowski
2016-06-03 7:24 ` Sylwester Sosnowski
2016-06-03 11:52 ` Jan Beulich [this message]
2016-06-03 12:02 ` Jürgen Walter
2016-06-03 13:26 ` Jan Beulich
2016-06-03 14:20 ` Jan Beulich
2016-06-04 14:36 ` Jürgen Walter
2016-06-06 7:59 ` Jan Beulich
2016-06-04 15:15 ` Jürgen Walter
2016-06-06 8:41 ` Jan Beulich
2016-06-06 9:09 ` Jürgen Walter
2016-06-06 9:43 ` Jan Beulich
2016-06-06 14:01 ` Boris Ostrovsky
2016-06-06 14:21 ` Jan Beulich
2016-06-06 14:45 ` Boris Ostrovsky
-- strict thread matches above, loose matches on Subject: below --
2016-06-15 10:45 Andrey Grodzovsky
2016-06-15 13:14 ` Jan Beulich
2016-06-18 3:24 ` Andrey Grodzovsky
2016-06-20 6:57 ` Jan Beulich
2016-06-02 19:49 Sylwester Sosnowski
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