Re: [Xen-devel] [PATCH v5 11/12] livepatch: Add metadata runtime retrieval mechanism

From: Ross Lagerwall <ross.lagerwall@citrix.com>
To: Pawel Wieczorkiewicz <wipawel@amazon.de>,
	<xen-devel@lists.xenproject.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	Julien Grall <julien@xen.org>, Wei Liu <wl@xen.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	George Dunlap <George.Dunlap@eu.citrix.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Ian Jackson <ian.jackson@eu.citrix.com>,
	mpohlack@amazon.com, Jan Beulich <jbeulich@suse.com>
Subject: Re: [Xen-devel] [PATCH v5 11/12] livepatch: Add metadata runtime retrieval mechanism
Date: Tue, 19 Nov 2019 17:11:18 +0000	[thread overview]
Message-ID: <9a1c562d-6d18-31c4-c730-f00b41079a7a@citrix.com> (raw)
In-Reply-To: <20191114130653.51185-12-wipawel@amazon.de>

On 11/14/19 1:06 PM, Pawel Wieczorkiewicz wrote:
> Extend the livepatch list operation to fetch also payloads' metadata.
> This is achieved by extending the sysctl list interface with 2 extra
> guest handles:
> * metadata     - an array of arbitrary size strings
> * metadata_len - an array of metadata strings' lengths (uin32_t each)
> 
> Payloads' metadata is a string of arbitrary size and does not have an
> upper bound limit. It may also vary in size between payloads.
> 
> In order to let the userland allocate enough space for the incoming
> data add a metadata total size field to the list sysctl operation and
> fill it with total size of all payloads' metadata.
> 
> Extend the libxc to handle the metadata back-to-back data transfers
> as well as metadata length array data transfers.
> 
> The xen-livepatch userland tool is extended to always display the
> metadata for each received module. The metadata is received with the
> following format: key=value\0key=value\0...key=value\0. The format is
> modified to the following one: key=value;key=value;...key=value.
> The new format allows to easily parse the metadata for a given module
> by a machine.
> 
> Signed-off-by: Pawel Wieczorkiewicz <wipawel@amazon.de>
> Reviewed-by: Andra-Irina Paraschiv <andraprs@amazon.com>
> Reviewed-by: Martin Pohlack <mpohlack@amazon.de>
> Reviewed-by: Norbert Manthey <nmanthey@amazon.de>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
Reviewed-by: Ross Lagerwall <ross.lagerwall@citrix.com>

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