linux-kernel - Re: [PATCH v6 5/7] arm64: kvm: route synchronous external abort exceptions to el2

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Date:   Mon, 16 Oct 2017 12:44:56 +0100
From:   James Morse <james.morse@....com>
To:     gengdongjiu <gengdongjiu@...wei.com>
CC:     christoffer.dall@...aro.org, marc.zyngier@....com,
        rkrcmar@...hat.com, linux@...linux.org.uk, catalin.marinas@....com,
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        zjzhang@...eaurora.org, linux-arm-kernel@...ts.infradead.org,
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Subject: Re: [PATCH v6 5/7] arm64: kvm: route synchronous external abort exceptions
 to el2

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