Re: [Xen-devel] [PATCH v8 05/13] libxl: Load guest BIOS from file

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 22/08/16 15:26, Wei Liu wrote:
> On Mon, Aug 22, 2016 at 02:26:11PM +0100, Andrew Cooper wrote:
>> On 22/08/16 14:13, Wei Liu wrote:
>>> On Fri, Aug 19, 2016 at 03:43:00PM +0100, Andrew Cooper wrote:
>>>> On 18/08/16 15:13, Wei Liu wrote:
>>>>> From: Anthony PERARD <anthony.perard@xxxxxxxxxx>
>>>>>
>>>>> The path to the BIOS blob can be overriden by the xl's
>>>>> bios_path_override option, or provided by u.hvm.bios_firmware in the
>>>>> domain_build_info struct by other libxl user.
>>>>>
>>>>> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
>>>>> Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
>>>> This introduces a regression, but I am not sure how best to fix it.
>>>>
>>>> [root@xrtuk-09-12 xen-test-framework]# xl -vvv create -p
>>>> tests/selftest/test-hvm32-selftest.cfg
>>>> Parsing config from tests/selftest/test-hvm32-selftest.cfg
>>>> libxl: debug: libxl_create.c:1603:do_domain_create: ao 0xa6b9f0: create:
>>>> how=(nil) callback=(nil) poller=0xa6c120
>>>> libxl: debug: libxl_create.c:959:initiate_domain_create: running bootloader
>>>> libxl: debug: libxl_bootloader.c:324:libxl__bootloader_run: not a PV
>>>> domain, skipping bootloader
>>>> libxl: debug: libxl_event.c:686:libxl__ev_xswatch_deregister: watch
>>>> w=0xa6cc30: deregister unregistered
>>>> libxl: debug: libxl_numa.c:483:libxl__get_numa_candidate: New best NUMA
>>>> placement candidate found: nr_nodes=1, nr_cpus=12, nr_vcpus=17,
>>>> free_memkb=30611
>>>> libxl: detail: libxl_dom.c:182:numa_place_domain: NUMA placement
>>>> candidate with 1 nodes, 12 cpus and 30611 KB free selected
>>>> domainbuilder: detail: xc_dom_allocate: cmdline="(null)", features="(null)"
>>>> domainbuilder: detail: xc_dom_kernel_file:
>>>> filename="/opt/xen-test-framework/tests/selftest/test-hvm32-selftest"
>>>> domainbuilder: detail: xc_dom_malloc_filemap    : 1090 kB
>>>> libxl: debug: libxl_dom.c:874:libxl__load_hvm_firmware_module: Loading
>>>> BIOS: /usr/libexec/xen/boot/bios.bin
>>>> libxl: error: libxl_dom.c:882:libxl__load_hvm_firmware_module: failed to
>>>> read BIOS file: No such file or directory
>>>>
>>>> In this case, tools have been built with ./configure --disable-seabios
>>>>
>>>> As a result, /usr/libexec/xen/boot/bios.bin (name altered a patch sent
>>>> separately) isn't built or installed.
>>>>
>>>> I think libxl needs to logic to determine which firmware to use based on
>>>> the available CONFIG_* options it was built with.
>>> I don' quite follow here.
>>>
>>> Do you mean if user hasn't specified any bios= option, (s)he gets
>>> whatever available?
>>>
>>> I think we should stick with the seabios-default behaviour to avoid
>>> surprising breakage.
>>>
>>> If you don't want any bois, maybe we should provide a bios=none option?
>> XenServer is built with ./configure --disable-seabios because we don't
>> use it (yet).  This means that SeaBIOS is not built, installed, or
>> available.
>>
>> Because of this change, libxl unconditionally assumes the presence of
>> SeaBIOS, and tries to use the installed seabios binary.
> Right, this needs fixing.
>
> We can restore the behaviour in libxl -- if you specify a not available
> bios, libxl won't complain, hvmloader will crash in the same way as
> before.

HVMLoader works fine.  I am not sure how you got this idea.


For XTF, we use firmware_override= to replace hvmloader with something
else.  As bios= is specific to hvmloader, it shouldn't be mandatory, and
should probably have an explicit none option.

~Andrew

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