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Re: [Xen-devel] [PATCH v2] x86/cpuid: Extend the cpuid= option to support all named features
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 25 Sep 2019 13:32:19 +0100
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 25 Sep 2019 12:32:26 +0000
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On 25/09/2019 13:30, Jan Beulich wrote:
> On 05.09.2019 21:49, Andrew Cooper wrote:
>> For gen-cpuid.py, fix a comment describing self.names, and generate the
>> reverse mapping in self.values. Write out INIT_FEATURE_NAMES which maps a
>> string name to a bit position.
>>
>> For parse_cpuid(), use cmdline_strcmp() and perform a binary search over
>> INIT_FEATURE_NAMES. A tweak to cmdline_strcmp() is needed to break at equals
>> signs as well.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> ---
>> CC: Jan Beulich <JBeulich@xxxxxxxx>
>> CC: Wei Liu <wl@xxxxxxx>
>> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>>
>> v2:
>> * Rebase over cmdline_strcmp()
>> ---
>> xen/arch/x86/cpuid.c | 75
>> +++++++++++++++++++++++++++++++-------------------
>> xen/common/kernel.c | 6 ++--
>> xen/include/xen/lib.h | 4 +--
>> xen/tools/gen-cpuid.py | 22 +++++++++++++--
>> 4 files changed, 71 insertions(+), 36 deletions(-)
> I've noticed this only now: This change would have wanted to be
> accompanied by an adjustment to the command line doc.
I debated that, but I don't want to give people the idea that using
cpuid=no-lm might be a sensible thing to do.
~Andrew
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