From: Oleksandr <olekstysh@gmail.com>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org,
Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
Juergen Gross <jgross@suse.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Julien Grall <julien@xen.org>
Subject: Re: [PATCH V2 3/4] xen/unpopulated-alloc: Add mechanism to use Xen resource
Date: Tue, 9 Nov 2021 20:51:54 +0200 [thread overview]
Message-ID: <00a9467a-3e48-9c68-1ac2-7ec2c7380d97@gmail.com> (raw)
In-Reply-To: <0b1837f9-57ef-8deb-df78-cb7841d93d68@oracle.com>
On 28.10.21 22:08, Boris Ostrovsky wrote:
Hi Boris
I am sorry for the late response.
>
> On 10/26/21 12:05 PM, Oleksandr Tyshchenko wrote:
>> +static void unpopulated_init(void)
>> +{
>> + static bool inited = false;
>> + int ret;
>> +
>> + if (inited)
>> + return;
>> +
>> + /*
>> + * Try to initialize Xen resource the first and fall back to
>> default
>> + * resource if arch doesn't offer one.
>> + */
>> + ret = arch_xen_unpopulated_init(&xen_resource);
>> + if (!ret)
>> + target_resource = &xen_resource;
>> + else if (ret == -ENOSYS)
>> + target_resource = &iomem_resource;
>> + else
>> + pr_err("Cannot initialize Xen resource\n");
>
>
> I'd pass target_resource as a parameter to arch_xen_unpopulated_init()
> instead. Default routine will assign it iomem_resource and you won't
> have to deal with -ENOSYS.
That would be much better, thank you. Will do.
>
>
>
> Also, what happens in case of error? Is it fatal? I don't think your
> changes in fill_list() will work.
The error is fatal as we don't have a suitable resource to allocate a
region from, and yes, the fill_list() must not be called.
>
>
>
>> +
>> + inited = true;
>
>
> I agree with Stefano in that it would be better to call this from an
> init function, and you won't have t worry about multiple calls here.
Yes, that's good point, thank you. Will do.
>
>
>
> -boris
--
Regards,
Oleksandr Tyshchenko
next prev parent reply other threads:[~2021-11-09 18:52 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-26 16:05 [PATCH V2 0/4] xen: Add support of extended regions (safe ranges) on Arm Oleksandr Tyshchenko
2021-10-26 16:05 ` [PATCH V2 1/4] xen/unpopulated-alloc: Drop check for virt_addr_valid() in fill_list() Oleksandr Tyshchenko
2021-10-28 18:57 ` Boris Ostrovsky
2021-10-26 16:05 ` [PATCH V2 2/4] arm/xen: Switch to use gnttab_setup_auto_xlat_frames() for DT Oleksandr Tyshchenko
2021-10-28 1:28 ` Stefano Stabellini
2021-11-10 22:14 ` Oleksandr
2021-11-19 0:32 ` Stefano Stabellini
2021-11-19 18:25 ` Oleksandr
2021-10-26 16:05 ` [PATCH V2 3/4] xen/unpopulated-alloc: Add mechanism to use Xen resource Oleksandr Tyshchenko
2021-10-28 16:37 ` Stefano Stabellini
2021-11-09 18:34 ` Oleksandr
2021-11-19 0:59 ` Stefano Stabellini
2021-11-19 18:18 ` Oleksandr
2021-11-20 2:19 ` Stefano Stabellini
2021-11-23 16:46 ` Oleksandr
2021-11-23 21:25 ` Stefano Stabellini
2021-11-24 9:33 ` Oleksandr
2021-11-24 5:16 ` Juergen Gross
2021-11-24 9:37 ` Oleksandr
2021-10-28 19:08 ` Boris Ostrovsky
2021-11-09 18:51 ` Oleksandr [this message]
2021-10-26 16:05 ` [PATCH V2 4/4] arm/xen: Read extended regions from DT and init " Oleksandr Tyshchenko
2021-10-28 1:40 ` Stefano Stabellini
2021-11-10 20:21 ` Oleksandr
2021-11-19 1:19 ` Stefano Stabellini
2021-11-19 20:23 ` Oleksandr
2021-11-20 2:36 ` Stefano Stabellini
2021-11-20 13:38 ` Oleksandr
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=00a9467a-3e48-9c68-1ac2-7ec2c7380d97@gmail.com \
--to=olekstysh@gmail.com \
--cc=boris.ostrovsky@oracle.com \
--cc=jgross@suse.com \
--cc=julien@xen.org \
--cc=linux-kernel@vger.kernel.org \
--cc=oleksandr_tyshchenko@epam.com \
--cc=sstabellini@kernel.org \
--cc=xen-devel@lists.xenproject.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).