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Re: [PATCH 00/62] target/arm: Implement FEAT_HAFDBS


From: Richard Henderson
Subject: Re: [PATCH 00/62] target/arm: Implement FEAT_HAFDBS
Date: Mon, 4 Jul 2022 20:28:28 +0530
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1

On 7/4/22 20:24, Peter Maydell wrote:
Previously, we had A-profile allocate separate mmu_idx for secure
vs non-secure.  I've done away with that.  Now, I flush all mmu_idx
when SCR_EL3.NS is changed.  I did not see how we could reasonably
add 8 more mmu_idx for Realm.  Moreover, I had a look through ARM
Trusted Firmware, at the code paths used to change between Secure
and Nonsecure.  We wind up flushing all of these mmu_idx anyway while
swapping the EL1+EL2 cpregs, so there is no gain at all in attempting
to keep them live at the same time within qemu.

Is there no SMC/interrupt/etc at all which is handled as a "just do the
thing at EL3" without dropping down to secure EL2/EL1 ?

I'm sure there is, but it's only swapping between S EL[012] and NS EL[012] that concerned me. Is there something that I'm missing?


r~



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