Re: [Xen-devel] [PATCH V3] x86, amd_ucode: Skip microcode updates for final levels

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.08.15 at 21:34, <aravind.gopalakrishnan@xxxxxxx> wrote:
> --- a/xen/arch/x86/microcode_amd.c
> +++ b/xen/arch/x86/microcode_amd.c
> @@ -347,6 +347,43 @@ static int container_fast_forward(const void *data, 
> size_t size_left, size_t *of
>      return 0;
>  }
>  
> +/*
> + * The 'final_levels' of patch ids have been obtained empirically.
> + * Refer bug https://bugzilla.suse.com/show_bug.cgi?id=913996 
> + * for details of the issue. The short version is that people
> + * using certain Fam10h systems noticed system hang issues when
> + * trying to update microcode levels beyond the patch IDs below.
> + * From internal discussions, we gathered that OS/hypervisor
> + * cannot reliably perform microcode updates beyond these levels
> + * due to hardware issues. Therefore, we need to abort microcode
> + * update process if we hit any of these levels.
> + */
> +static unsigned int final_levels[] = {

const

> +    0x01000098,
> +    0x0100009f,
> +    0x010000af
> +};
> +
> +static bool_t check_final_patch_levels(int cpu)

unsigned int

Jan


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