* Borislav Petkov <[email protected]> wrote:
> From: Yazen Ghannam <[email protected]>
>
> Syndrome information is no longer contained in MCA_STATUS for SMCA
> systems but in a new register.
>
> Add a synd field to struct mce to hold MCA_SYND register value. Add it
> to the end of struct mce to maintain compatibility with old versions of
> mcelog. Also, add it to the respective tracepoint.
> /* AMD-specific bits */
> +#define MCI_STATUS_TCC (1ULL<<55) /* Task context corrupt */
> +#define MCI_STATUS_SYNDV (1ULL<<53) /* synd reg. valid */
> --- a/arch/x86/include/uapi/asm/mce.h
> +++ b/arch/x86/include/uapi/asm/mce.h
> @@ -26,6 +26,7 @@ struct mce {
> __u32 socketid; /* CPU socket ID */
> __u32 apicid; /* CPU initial apic ID */
> __u64 mcgcap; /* MCGCAP MSR: machine check capabilities of CPU */
> + __u64 synd; /* MCA_SYND MSR: only valid on SMCA systems */
> };
So why does neither the changelog nor the code comment actually _explain_ this
and
give aa bit of a background about what 'syndrome information' is and why we
want
to have kernel support for it?
This is why I hate kernel tooling that is not part of the kernel tree - the
mcelog
patch (hopefully ...) would tell us more about all this - but it's separate and
this patch does not tell us anything ...
Thanks,
Ingo
