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Re: [PATCH] x86/amd: Fix DE_CFG truncation in amd_check_zenbleed()
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 31 Jul 2023 13:44:08 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 31 Jul 2023 12:44:35 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31/07/2023 10:02 am, Jan Beulich wrote:
> On 28.07.2023 20:17, Andrew Cooper wrote:
>> This line:
>>
>> val &= ~chickenbit;
>>
>> ends up truncating val to 32 bits, and turning off various errata workarounds
>> in Zen2 systems.
>>
>> Fixes: f91c5ea97067 ("x86/amd: Mitigations for Zenbleed")
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> ---
>> CC: Jan Beulich <JBeulich@xxxxxxxx>
>> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>> CC: Wei Liu <wl@xxxxxxx>
>>
>> The choice is between int or uint64_t. This is one case where the insistence
>> on using unsigned int as a default data type is genuinely unsafe.
> It is not. The (unsigned) type should have been wide enough. From a Misra
> perspective I'm pretty sure we would be better off using uint64_t. But in
> the interest of getting this in without a lot of discussion I'll leave the
> decision up to you; either way
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Roger asked for uint64_t too so I'll go with that. Thanks.
~Andrew
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