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Re: [PATCH v3] x86/amd: Address AMD erratum #1485
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 17 Oct 2023 10:23:45 +0100
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Henry Wang <Henry.Wang@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 17 Oct 2023 09:23:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17/10/2023 10:13 am, Roger Pau Monné wrote:
> On Tue, Oct 17, 2023 at 08:50:45AM +0100, Andrew Cooper wrote:
>> On 17/10/2023 8:44 am, Jan Beulich wrote:
>>> On 13.10.2023 17:38, Alejandro Vallejo wrote:
>>>> Fix adapted off Linux's mailing list:
>>>>
>>>> https://lore.kernel.org/lkml/D99589F4-BC5D-430B-87B2-72C20370CF57@xxxxxxxxxxxxx/T/#u
>>> Why reference the bug report when there's a proper commit (f454b18e07f5)
>>> now?
>>> Plus in any event a short summary of the erratum would help if put right
>>> here
>>> (without needing to look up any documents or follow any links).
>> That is not public information yet. The erratum number alone is the
>> best we can do at this juncture.
>>>> --- a/xen/arch/x86/cpu/amd.c
>>>> +++ b/xen/arch/x86/cpu/amd.c
>>>> @@ -1004,6 +1004,28 @@ static void cf_check zen2_disable_c6(void *arg)
>>>> wrmsrl(MSR_AMD_CSTATE_CFG, val & mask);
>>>> }
>>>>
>>>> +static void amd_check_erratum_1485(void)
>>>> +{
>>>> + uint64_t val, chickenbit = (1 << 5);
>>> Linux gives the bit a name. Any reason you don't?
>> There are multiple different names depending on where you look, and none
>> are particularly relevant here.
> Could we make chickenbit const static?
Why would we want to force something that's optimised to an instruction
immediate into a .data variable?
~Andrew
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