Hi gengdongjiu, On 14/09/17 12:12, gengdongjiu wrote: > On 2017/9/8 0:31, James Morse wrote: >> KVM already handles external aborts from lower exception levels, no more work >> needs doing for TEA. > If it is firmware first solution, that is SCR_EL3.EA=1, all SError interrupt and synchronous External > Abort exceptions are taken to EL3, so EL3 firmware will handle it, KVM no needs to handle it. > > HCR_EL3.TEA is only for EL3 to check its value to decide to jump to hypervisor or kernel. > >> >> What happens when a guest access the RAS-Error-Record registers? >> >> Before we can set HCR_EL2.TERR I think we need to add some minimal emulation for >> the registers it traps. Most of them should be RAZ/WI, so it should be >> straightforward. (I think KVMs default is to emulate an undef for unknown traps). > Today I added the support to do some minimal emulation for RAS-Error-Record registers, thanks > for the good suggestion. Where can I find this patch? I'd like to repost it as part of the SError_rework/RAS/IESB series: this is one of the bits KVM needs but I didn't touch as it looks like your updated version of this patch should cover it. Thanks, James
