From: Paulina Szubarczyk <paulinaszubarczyk@gmail.com>
To: Wei Liu <wei.liu2@citrix.com>
Cc: sstabellini@kernel.org, ian.jackson@eu.citrix.com,
david.vrabel@citrix.com, anthony.perard@citrix.com,
xen-devel@lists.xenproject.org, roger.pau@citrix.com
Subject: Re: [PATCH v3 2/2] qdisk - hw/block/xen_disk: grant copy implementation
Date: Fri, 15 Jul 2016 12:28:48 +0200 [thread overview]
Message-ID: <5788BAE0.9080607@gmail.com> (raw)
In-Reply-To: <20160714103752.GQ31770@citrix.com>
On 07/14/2016 12:37 PM, Wei Liu wrote:
> On Wed, Jun 22, 2016 at 10:38:53AM +0200, Paulina Szubarczyk wrote:
>> diff --git a/configure b/configure
>> index e41876a..355d3fa 100755
>> --- a/configure
>> +++ b/configure
>> @@ -1843,7 +1843,7 @@ fi
>> # xen probe
>>
>> if test "$xen" != "no" ; then
>> - xen_libs="-lxenstore -lxenctrl -lxenguest"
>> + xen_libs="-lxenstore -lxenctrl -lxenguest -lxengnttab"
>>
>
> First thing, -lxengnttab should be in xen_stable_libs.
>
Do I understand correctly that I should add a new variable
"xen_stable_libs"? I could not find it in the qemu tree used anywhere else.
> The probing needs to be more sophisticated.
>
> You need to probe the new function your added as well. Just a few lines
> below xen_stable_libs there is a section for hand-coded probing source
> code, which you would need to modify.
>
> Assuming your gnttab change will be merged into 4.8 (the release under
> development at the moment), you need to have a separate program for it.
>
I will add that.
> After you've done proper probing, you will know which version of Xen
> this qemu is compiling against. And then, there should be some fallback
> mechanism to compile and run this qemu with older version of xen. This
> is not too hard because you can guard your code with feature flag or
> ifdef (please consult Stefan and Anthony which method to use).
>
> Feel free to ask questions. I will try my best to explain.
>
>>
>> + blkdev->feature_grant_copy =
>> + (xengnttab_grant_copy(blkdev->xendev.gnttabdev, 0, NULL) == 0);
>
> This is a bit problematic. As this patch stands, it won't compile on
> older version of Xen because there is no such function there.
There is a variable CONFIG_XEN_CTRL_INTERFACE_VERSION holding current
version of the Xen control library this qemu is configured with. It is
set from the configure file. The feature could be guarded with ifdef by
a new variable CONFIG_XEN_LIBS_INTERFACE_VERSION or they could be
unified to CONFIG_XEN_TOOLS_INTERFACE_VERSION to not fill the same value
twice.
Paulina
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next prev parent reply other threads:[~2016-07-15 10:28 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-22 8:38 [PATCH v3 0/2] qemu-qdisk: Implementation of grant copy operation Paulina Szubarczyk
2016-06-22 8:38 ` [PATCH v3 1/2] Interface for grant copy operation in libs Paulina Szubarczyk
2016-06-22 9:37 ` David Vrabel
2016-06-22 9:53 ` Paulina Szubarczyk
2016-06-22 11:24 ` Wei Liu
2016-06-22 14:19 ` Paulina Szubarczyk
2016-06-22 11:21 ` Wei Liu
2016-06-22 12:37 ` David Vrabel
2016-06-22 13:29 ` Wei Liu
2016-06-22 13:52 ` David Vrabel
2016-06-22 14:52 ` Wei Liu
2016-06-22 16:49 ` Wei Liu
2016-07-06 15:49 ` Roger Pau Monné
2016-07-05 16:27 ` George Dunlap
2016-07-08 13:18 ` Wei Liu
2016-07-13 9:12 ` Wei Liu
2016-06-22 8:38 ` [PATCH v3 2/2] qdisk - hw/block/xen_disk: grant copy implementation Paulina Szubarczyk
2016-07-13 12:34 ` Paulina Szubarczyk
2016-07-14 10:37 ` Wei Liu
2016-07-15 10:28 ` Paulina Szubarczyk [this message]
2016-07-15 11:15 ` Wei Liu
2016-07-15 17:11 ` Anthony PERARD
2016-07-19 10:16 ` Paulina Szubarczyk
2016-07-15 16:55 ` Anthony PERARD
2016-07-19 10:51 ` Paulina Szubarczyk
2016-07-19 9:12 ` Roger Pau Monné
2016-07-19 10:12 ` Paulina Szubarczyk
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