Hi Dongjiu Geng, On 22/02/18 18:02, Dongjiu Geng wrote: > The RAS SError Syndrome can be Implementation-Defined, > arm64_is_ras_serror() is used to judge whether it is RAS SError, > but arm64_is_ras_serror() does not include this judgement. In order > to avoid function name confusion, we rename the arm64_is_ras_serror() > to arm64_is_categorized_ras_serror(), this function is used to > judge whether it is categorized RAS Serror. I don't see how 'categorized' is relevant. The most significant ISS bit is used to determine if this is an IMP-DEF ESR, or one that uses the architected layout. DFSC of zero means uncategorised. What should we do with an uncategorised SError? >From 2.4.3 "ESB and other physical errors" of [0] | It is IMPLEMENTATION DEFINED whether [..]uncategorized SError interrupts | are containable or Uncontainable, and whether they can be synchronized by an | Error Synchronization Barrier. We treat uncategorized as uncontainable as that's the worst thing it could be. On aarch32 uncontainable and uncategorized even share an encoding. (AET:00 in G7.2.43 "DFSR, Data Fault Status Register", 'state of the PE after taking the SError interrupt exception') > Change some code notes, unrecoverable RAS errors is imprecise, but > Recoverable RAS errors is precise. Unrecoverable and Recoverable (but we don't know where it is) are both grouped into 'can't make progress'. The comment says: | The exception may have been imprecise. because one of those two is imprecise. If anyone cares which one is which, they can read the spec. I expect this code will one day be replaced with proper kernel-first support, its only here to avoid panic()ing due to corrected errors. Thanks, James [0] https://static.docs.arm.com/ddi0587/a/RAS%20Extension-release%20candidate_march_29.pdf _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
